Decred: Secret hash swap tests.

basicswap/basicswap.py

@@ -5,7 +5,6 @@
 # file LICENSE or http://www.opensource.org/licenses/mit-license.php.
 
 import os
-import re
 import sys
 import zmq
 import copy
@@ -16,7 +15,6 @@ import random
 import shutil
 import string
 import struct
-import hashlib
 import secrets
 import datetime as dt
 import threading
@@ -53,11 +51,13 @@ from .util.script import (
 )
 from .util.address import (
     toWIF,
-    getKeyID,
     decodeWif,
     decodeAddress,
     pubkeyToAddress,
 )
+from .util.crypto import (
+    sha256,
+)
 from basicswap.util.network import is_private_ip_address
 from .chainparams import (
     Coins,
@@ -147,7 +147,7 @@ from basicswap.db_util import (
     remove_expired_data,
 )
 
-PROTOCOL_VERSION_SECRET_HASH = 4
+PROTOCOL_VERSION_SECRET_HASH = 5
 MINPROTO_VERSION_SECRET_HASH = 4
 
 PROTOCOL_VERSION_ADAPTOR_SIG = 4
@@ -209,6 +209,16 @@ class WatchedOutput():  # Watch for spends
         self.swap_type = swap_type
 
 
+class WatchedScript():  # Watch for txns containing outputs
+    __slots__ = ('bid_id', 'script', 'tx_type', 'swap_type')
+
+    def __init__(self, bid_id: bytes, script: bytes, tx_type, swap_type):
+        self.bid_id = bid_id
+        self.script = script
+        self.tx_type = tx_type
+        self.swap_type = swap_type
+
+
 class WatchedTransaction():
     # TODO
     # Watch for presence in mempool (getrawtransaction)
@@ -454,6 +464,10 @@ class BasicSwap(BaseApp):
             last_height_checked = session.query(DBKVInt).filter_by(key='last_height_checked_' + chainparams[coin]['name']).first().value
         except Exception:
             last_height_checked = 0
+        try:
+            block_check_min_time = session.query(DBKVInt).filter_by(key='block_check_min_time_' + chainparams[coin]['name']).first().value
+        except Exception:
+            block_check_min_time = 0xffffffffffffffff
         session.close()
         session.remove()
 
@@ -472,7 +486,9 @@ class BasicSwap(BaseApp):
             'blocks_confirmed': chain_client_settings.get('blocks_confirmed', 6),
             'conf_target': chain_client_settings.get('conf_target', 2),
             'watched_outputs': [],
+            'watched_scripts': [],
             'last_height_checked': last_height_checked,
+            'block_check_min_time': block_check_min_time,
             'use_segwit': chain_client_settings.get('use_segwit', default_segwit),
             'use_csv': chain_client_settings.get('use_csv', default_csv),
             'core_version_group': chain_client_settings.get('core_version_group', 0),
@@ -1150,12 +1166,17 @@ class BasicSwap(BaseApp):
             if bid.participate_tx and bid.participate_tx.txid:
                 self.addWatchedOutput(coin_to, bid.bid_id, bid.participate_tx.txid.hex(), bid.participate_tx.vout, BidStates.SWAP_PARTICIPATING)
 
+            if bid.participate_tx and bid.participate_tx.txid is None:
+                self.addWatchedScript(coin_to, bid.bid_id, self.ci(coin_to).getScriptDest(bid.participate_tx.script), TxTypes.PTX)
+                if bid.initiate_tx and bid.initiate_tx.chain_height:
+                    self.setLastHeightCheckedStart(coin_to, bid.initiate_tx.chain_height)
+
             if self.coin_clients[coin_from]['last_height_checked'] < 1:
                 if bid.initiate_tx and bid.initiate_tx.chain_height:
-                    self.coin_clients[coin_from]['last_height_checked'] = bid.initiate_tx.chain_height
+                    self.setLastHeightCheckedStart(coin_from, bid.initiate_tx.chain_height)
             if self.coin_clients[coin_to]['last_height_checked'] < 1:
                 if bid.participate_tx and bid.participate_tx.chain_height:
-                    self.coin_clients[coin_to]['last_height_checked'] = bid.participate_tx.chain_height
+                    self.setLastHeightCheckedStart(coin_to, bid.participate_tx.chain_height)
 
         # TODO process addresspool if bid has previously been abandoned
 
@@ -1172,6 +1193,9 @@ class BasicSwap(BaseApp):
         self.removeWatchedOutput(Coins(offer.coin_from), bid.bid_id, None)
         self.removeWatchedOutput(Coins(offer.coin_to), bid.bid_id, None)
 
+        self.removeWatchedScript(Coins(offer.coin_from), bid.bid_id, None)
+        self.removeWatchedScript(Coins(offer.coin_to), bid.bid_id, None)
+
         if bid.state in (BidStates.BID_ABANDONED, BidStates.SWAP_COMPLETED):
             # Return unused addrs to pool
             itx_state = bid.getITxState()
@@ -1859,7 +1883,7 @@ class BasicSwap(BaseApp):
         path += '/' + str(date.year) + '/' + str(date.month) + '/' + str(date.day)
         path += '/' + str(contract_count)
 
-        return hashlib.sha256(bytes(self.callcoinrpc(Coins.PART, 'extkey', ['info', evkey, path])['key_info']['result'], 'utf-8')).digest()
+        return sha256(bytes(self.callcoinrpc(Coins.PART, 'extkey', ['info', evkey, path])['key_info']['result'], 'utf-8'))
 
     def getReceiveAddressFromPool(self, coin_type, bid_id: bytes, tx_type):
         self.log.debug('Get address from pool bid_id {}, type {}, coin {}'.format(bid_id.hex(), tx_type, coin_type))
@@ -2337,7 +2361,12 @@ class BasicSwap(BaseApp):
                     msg_buf.proof_utxos = ci_to.encodeProofUtxos(proof_utxos)
 
                 contract_count = self.getNewContractId()
-                msg_buf.pkhash_buyer = getKeyID(self.getContractPubkey(dt.datetime.fromtimestamp(now).date(), contract_count))
+                contract_pubkey = self.getContractPubkey(dt.datetime.fromtimestamp(now).date(), contract_count)
+                msg_buf.pkhash_buyer = ci_from.pkh(contract_pubkey)
+                pkhash_buyer_to = ci_to.pkh(contract_pubkey)
+                if pkhash_buyer_to != msg_buf.pkhash_buyer:
+                    # Different pubkey hash
+                    msg_buf.pkhash_buyer_to = pkhash_buyer_to
             else:
                 raise ValueError('TODO')
 
@@ -2370,6 +2399,9 @@ class BasicSwap(BaseApp):
             )
             bid.setState(BidStates.BID_SENT)
 
+            if len(msg_buf.pkhash_buyer_to) > 0:
+                bid.pkhash_buyer_to = msg_buf.pkhash_buyer_to
+
             try:
                 session = scoped_session(self.session_factory)
                 self.saveBidInSession(bid_id, bid, session)
@@ -2554,13 +2586,19 @@ class BasicSwap(BaseApp):
 
         coin_from = Coins(offer.coin_from)
         ci_from = self.ci(coin_from)
+        ci_to = self.ci(offer.coin_to)
         bid_date = dt.datetime.fromtimestamp(bid.created_at).date()
 
         secret = self.getContractSecret(bid_date, bid.contract_count)
-        secret_hash = hashlib.sha256(secret).digest()
+        secret_hash = sha256(secret)
 
         pubkey_refund = self.getContractPubkey(bid_date, bid.contract_count)
-        pkhash_refund = getKeyID(pubkey_refund)
+        pkhash_refund = ci_from.pkh(pubkey_refund)
+
+        if coin_from in (Coins.DCR, ):
+            op_hash = OpCodes.OP_SHA256_DECRED
+        else:
+            op_hash = OpCodes.OP_SHA256
 
         if bid.initiate_tx is not None:
             self.log.warning('Initiate txn %s already exists for bid %s', bid.initiate_tx.txid, bid_id.hex())
@@ -2569,21 +2607,19 @@ class BasicSwap(BaseApp):
         else:
             if offer.lock_type < TxLockTypes.ABS_LOCK_BLOCKS:
                 sequence = ci_from.getExpectedSequence(offer.lock_type, offer.lock_value)
-                script = atomic_swap_1.buildContractScript(sequence, secret_hash, bid.pkhash_buyer, pkhash_refund)
+                script = atomic_swap_1.buildContractScript(sequence, secret_hash, bid.pkhash_buyer, pkhash_refund, op_hash=op_hash)
             else:
                 if offer.lock_type == TxLockTypes.ABS_LOCK_BLOCKS:
-                    lock_value = self.callcoinrpc(coin_from, 'getblockcount') + offer.lock_value
+                    lock_value = ci_from.getChainHeight() + offer.lock_value
                 else:
                     lock_value = self.getTime() + offer.lock_value
                 self.log.debug('Initiate %s lock_value %d %d', ci_from.coin_name(), offer.lock_value, lock_value)
-                script = atomic_swap_1.buildContractScript(lock_value, secret_hash, bid.pkhash_buyer, pkhash_refund, OpCodes.OP_CHECKLOCKTIMEVERIFY)
+                script = atomic_swap_1.buildContractScript(lock_value, secret_hash, bid.pkhash_buyer, pkhash_refund, OpCodes.OP_CHECKLOCKTIMEVERIFY, op_hash=op_hash)
 
-            p2sh = self.callcoinrpc(Coins.PART, 'decodescript', [script.hex()])['p2sh']
+            bid.pkhash_seller = ci_to.pkh(pubkey_refund)
-
-            bid.pkhash_seller = pkhash_refund
 
             prefunded_tx = self.getPreFundedTx(Concepts.OFFER, offer.offer_id, TxTypes.ITX_PRE_FUNDED)
-            txn = self.createInitiateTxn(coin_from, bid_id, bid, script, prefunded_tx)
+            txn, lock_tx_vout = self.createInitiateTxn(coin_from, bid_id, bid, script, prefunded_tx)
 
             # Store the signed refund txn in case wallet is locked when refund is possible
             refund_txn = self.createRefundTxn(coin_from, txn, offer, bid, script)
@@ -2595,6 +2631,7 @@ class BasicSwap(BaseApp):
                 bid_id=bid_id,
                 tx_type=TxTypes.ITX,
                 txid=bytes.fromhex(txid),
+                vout=lock_tx_vout,
                 tx_data=bytes.fromhex(txn),
                 script=script,
             )
@@ -2615,6 +2652,11 @@ class BasicSwap(BaseApp):
             msg_buf.initiate_txid = bytes.fromhex(txid)
             msg_buf.contract_script = bytes(script)
 
+            # pkh sent in script is hashed with sha256, Decred expects blake256
+            if bid.pkhash_seller != pkhash_refund:
+                assert (ci_to.coin_type() == Coins.DCR or ci_from.coin_type() == Coins.DCR)  # [rm]
+                msg_buf.pkhash_seller = bid.pkhash_seller
+
             bid_bytes = msg_buf.SerializeToString()
             payload_hex = str.format('{:02x}', MessageTypes.BID_ACCEPT) + bid_bytes.hex()
 
@@ -3137,9 +3179,9 @@ class BasicSwap(BaseApp):
         if save_bid:
             self.saveBid(bid_id, bid, xmr_swap=xmr_swap)
 
-    def createInitiateTxn(self, coin_type, bid_id: bytes, bid, initiate_script, prefunded_tx=None) -> Optional[str]:
+    def createInitiateTxn(self, coin_type, bid_id: bytes, bid, initiate_script, prefunded_tx=None) -> (Optional[str], Optional[int]):
         if self.coin_clients[coin_type]['connection_type'] != 'rpc':
-            return None
+            return None, None
         ci = self.ci(coin_type)
 
         if ci.using_segwit():
@@ -3154,7 +3196,12 @@ class BasicSwap(BaseApp):
             txn_signed = pi.promoteMockTx(ci, prefunded_tx, initiate_script).hex()
         else:
             txn_signed = ci.createRawSignedTransaction(addr_to, bid.amount)
-        return txn_signed
+
+        txjs = ci.describeTx(txn_signed)
+        vout = getVoutByAddress(txjs, addr_to)
+        assert (vout is not None)
+
+        return txn_signed, vout
 
     def deriveParticipateScript(self, bid_id: bytes, bid, offer) -> bytearray:
         self.log.debug('deriveParticipateScript for bid %s', bid_id.hex())
@@ -3164,18 +3211,28 @@ class BasicSwap(BaseApp):
 
         secret_hash = atomic_swap_1.extractScriptSecretHash(bid.initiate_tx.script)
         pkhash_seller = bid.pkhash_seller
-        pkhash_buyer_refund = bid.pkhash_buyer
+
+        if bid.pkhash_buyer_to and len(bid.pkhash_buyer_to) > 0:
+            pkhash_buyer_refund = bid.pkhash_buyer_to
+        else:
+            pkhash_buyer_refund = bid.pkhash_buyer
+
+        if coin_to in (Coins.DCR, ):
+            op_hash = OpCodes.OP_SHA256_DECRED
+        else:
+            op_hash = OpCodes.OP_SHA256
 
         # Participate txn is locked for half the time of the initiate txn
         lock_value = offer.lock_value // 2
         if offer.lock_type < TxLockTypes.ABS_LOCK_BLOCKS:
             sequence = ci_to.getExpectedSequence(offer.lock_type, lock_value)
-            participate_script = atomic_swap_1.buildContractScript(sequence, secret_hash, pkhash_seller, pkhash_buyer_refund)
+            participate_script = atomic_swap_1.buildContractScript(sequence, secret_hash, pkhash_seller, pkhash_buyer_refund, op_hash=op_hash)
         else:
             # Lock from the height or time of the block containing the initiate txn
             coin_from = Coins(offer.coin_from)
-            initiate_tx_block_hash = self.callcoinrpc(coin_from, 'getblockhash', [bid.initiate_tx.chain_height, ])
+            block_header = self.ci(coin_from).getBlockHeaderFromHeight(bid.initiate_tx.chain_height)
-            initiate_tx_block_time = int(self.callcoinrpc(coin_from, 'getblock', [initiate_tx_block_hash, ])['time'])
+            initiate_tx_block_hash = block_header['hash']
+            initiate_tx_block_time = block_header['time']
             if offer.lock_type == TxLockTypes.ABS_LOCK_BLOCKS:
                 # Walk the coin_to chain back until block time matches
                 block_header_at = ci_to.getBlockHeaderAt(initiate_tx_block_time, block_after=True)
@@ -3188,7 +3245,7 @@ class BasicSwap(BaseApp):
                 self.log.debug('Setting lock value from time of block %s %s', Coins(coin_from).name, initiate_tx_block_hash)
                 contract_lock_value = initiate_tx_block_time + lock_value
             self.log.debug('participate %s lock_value %d %d', Coins(coin_to).name, lock_value, contract_lock_value)
-            participate_script = atomic_swap_1.buildContractScript(contract_lock_value, secret_hash, pkhash_seller, pkhash_buyer_refund, OpCodes.OP_CHECKLOCKTIMEVERIFY)
+            participate_script = atomic_swap_1.buildContractScript(contract_lock_value, secret_hash, pkhash_seller, pkhash_buyer_refund, OpCodes.OP_CHECKLOCKTIMEVERIFY, op_hash=op_hash)
         return participate_script
 
     def createParticipateTxn(self, bid_id: bytes, bid, offer, participate_script: bytearray):
@@ -3219,7 +3276,7 @@ class BasicSwap(BaseApp):
         refund_txn = self.createRefundTxn(coin_to, txn_signed, offer, bid, participate_script, tx_type=TxTypes.PTX_REFUND)
         bid.participate_txn_refund = bytes.fromhex(refund_txn)
 
-        chain_height = self.callcoinrpc(coin_to, 'getblockcount')
+        chain_height = ci.getChainHeight()
         txjs = self.callcoinrpc(coin_to, 'decoderawtransaction', [txn_signed])
         txid = txjs['txid']
 
@@ -3252,7 +3309,7 @@ class BasicSwap(BaseApp):
             prev_p2wsh = ci.getScriptDest(txn_script)
             script_pub_key = prev_p2wsh.hex()
         else:
-            script_pub_key = getP2SHScriptForHash(getKeyID(txn_script)).hex()
+            script_pub_key = getP2SHScriptForHash(ci.pkh(txn_script)).hex()
 
         prevout = {
             'txid': prev_txnid,
@@ -3262,18 +3319,17 @@ class BasicSwap(BaseApp):
             'amount': ci.format_amount(prev_amount)}
 
         bid_date = dt.datetime.fromtimestamp(bid.created_at).date()
-        if coin_type in (Coins.NAV, ):
+        privkey = self.getContractPrivkey(bid_date, bid.contract_count)
-            wif_prefix = chainparams[coin_type][self.chain]['key_prefix']
+        pubkey = ci.getPubkey(privkey)
-        else:
-            wif_prefix = chainparams[Coins.PART][self.chain]['key_prefix']
-        pubkey = self.getContractPubkey(bid_date, bid.contract_count)
-        privkey = toWIF(wif_prefix, self.getContractPrivkey(bid_date, bid.contract_count))
 
         secret = bid.recovered_secret
         if secret is None:
             secret = self.getContractSecret(bid_date, bid.contract_count)
         ensure(len(secret) == 32, 'Bad secret length')
 
+        self.log.debug('secret {}'.format(secret.hex()))
+        self.log.debug('sha256(secret) {}'.format(sha256(secret).hex()))
+
         if self.coin_clients[coin_type]['connection_type'] != 'rpc':
             return None
 
@@ -3294,40 +3350,40 @@ class BasicSwap(BaseApp):
 
         self.log.debug('addr_redeem_out %s', addr_redeem_out)
 
-        if ci.use_p2shp2wsh():
+        redeem_txn = ci.createRedeemTxn(prevout, addr_redeem_out, amount_out, txn_script)
-            redeem_txn = ci.createRedeemTxn(prevout, addr_redeem_out, amount_out, txn_script)
-        else:
-            redeem_txn = ci.createRedeemTxn(prevout, addr_redeem_out, amount_out)
         options = {}
         if ci.using_segwit():
             options['force_segwit'] = True
 
-        if coin_type in (Coins.NAV, ):
+        if coin_type in (Coins.NAV, Coins.DCR):
-            redeem_sig = ci.getTxSignature(redeem_txn, prevout, privkey)
+            privkey_wif = self.ci(coin_type).encodeKey(privkey)
+            redeem_sig = ci.getTxSignature(redeem_txn, prevout, privkey_wif)
         else:
-            redeem_sig = self.callcoinrpc(Coins.PART, 'createsignaturewithkey', [redeem_txn, prevout, privkey, 'ALL', options])
+            privkey_wif = self.ci(Coins.PART).encodeKey(privkey)
+            redeem_sig = self.callcoinrpc(Coins.PART, 'createsignaturewithkey', [redeem_txn, prevout, privkey_wif, 'ALL', options])
 
         if coin_type == Coins.PART or ci.using_segwit():
             witness_stack = [
                 bytes.fromhex(redeem_sig),
                 pubkey,
                 secret,
-                bytes((1,)),
+                bytes((1,)),  # Converted to OP_1 in Decred push_script_data
                 txn_script]
             redeem_txn = ci.setTxSignature(bytes.fromhex(redeem_txn), witness_stack).hex()
         else:
-            script = format(len(redeem_sig) // 2, '02x') + redeem_sig
+            script = (len(redeem_sig) // 2).to_bytes(1) + bytes.fromhex(redeem_sig)
-            script += format(33, '02x') + pubkey.hex()
+            script += (33).to_bytes(1) + pubkey
-            script += format(32, '02x') + secret.hex()
+            script += (32).to_bytes(1) + secret
-            script += format(OpCodes.OP_1, '02x')
+            script += (OpCodes.OP_1).to_bytes(1)
-            script += format(OpCodes.OP_PUSHDATA1, '02x') + format(len(txn_script), '02x') + txn_script.hex()
+            script += (OpCodes.OP_PUSHDATA1).to_bytes(1) + (len(txn_script)).to_bytes(1) + txn_script
-            redeem_txn = ci.setTxScriptSig(bytes.fromhex(redeem_txn), 0, bytes.fromhex(script)).hex()
+            redeem_txn = ci.setTxScriptSig(bytes.fromhex(redeem_txn), 0, script).hex()
-
+
-        if coin_type in (Coins.NAV, ):
+        if coin_type in (Coins.NAV, Coins.DCR):
             # Only checks signature
             ro = ci.verifyRawTransaction(redeem_txn, [prevout])
         else:
             ro = self.callcoinrpc(Coins.PART, 'verifyrawtransaction', [redeem_txn, [prevout]])
+
         ensure(ro['inputs_valid'] is True, 'inputs_valid is false')
         # outputs_valid will be false if not a Particl txn
         # ensure(ro['complete'] is True, 'complete is false')
@@ -3337,7 +3393,11 @@ class BasicSwap(BaseApp):
             # Check fee
             if ci.get_connection_type() == 'rpc':
                 redeem_txjs = self.callcoinrpc(coin_type, 'decoderawtransaction', [redeem_txn])
-                if ci.using_segwit() or coin_type in (Coins.PART, ):
+                if coin_type in (Coins.DCR, ):
+                    txsize = len(redeem_txn) // 2
+                    self.log.debug('size paid, actual size %d %d', tx_vsize, txsize)
+                    ensure(tx_vsize >= txsize, 'underpaid fee')
+                elif ci.use_tx_vsize():
                     self.log.debug('vsize paid, actual vsize %d %d', tx_vsize, redeem_txjs['vsize'])
                     ensure(tx_vsize >= redeem_txjs['vsize'], 'underpaid fee')
                 else:
@@ -3355,11 +3415,9 @@ class BasicSwap(BaseApp):
 
         ci = self.ci(coin_type)
         if coin_type in (Coins.NAV, Coins.DCR):
-            wif_prefix = chainparams[coin_type][self.chain]['key_prefix']
             prevout = ci.find_prevout_info(txn, txn_script)
         else:
             # TODO: Sign in bsx for all coins
-            wif_prefix = chainparams[Coins.PART][self.chain]['key_prefix']
             txjs = self.callcoinrpc(Coins.PART, 'decoderawtransaction', [txn])
             if ci.using_segwit():
                 p2wsh = ci.getScriptDest(txn_script)
@@ -3377,8 +3435,9 @@ class BasicSwap(BaseApp):
             }
 
         bid_date = dt.datetime.fromtimestamp(bid.created_at).date()
-        pubkey = self.getContractPubkey(bid_date, bid.contract_count)
+
-        privkey = toWIF(wif_prefix, self.getContractPrivkey(bid_date, bid.contract_count))
+        privkey = self.getContractPrivkey(bid_date, bid.contract_count)
+        pubkey = ci.getPubkey(privkey)
 
         lock_value = DeserialiseNum(txn_script, 64)
         sequence: int = 1
@@ -3405,19 +3464,25 @@ class BasicSwap(BaseApp):
         if offer.lock_type == TxLockTypes.ABS_LOCK_BLOCKS or offer.lock_type == TxLockTypes.ABS_LOCK_TIME:
             locktime = lock_value
 
-        if ci.use_p2shp2wsh():
+        refund_txn = ci.createRefundTxn(prevout, addr_refund_out, amount_out, locktime, sequence, txn_script)
-            refund_txn = ci.createRefundTxn(prevout, addr_refund_out, amount_out, locktime, sequence, txn_script)
-        else:
-            refund_txn = ci.createRefundTxn(prevout, addr_refund_out, amount_out, locktime, sequence)
 
         options = {}
         if self.coin_clients[coin_type]['use_segwit']:
             options['force_segwit'] = True
         if coin_type in (Coins.NAV, Coins.DCR):
-            refund_sig = ci.getTxSignature(refund_txn, prevout, privkey)
+            privkey_wif = ci.encodeKey(privkey)
+            refund_sig = ci.getTxSignature(refund_txn, prevout, privkey_wif)
         else:
-            refund_sig = self.callcoinrpc(Coins.PART, 'createsignaturewithkey', [refund_txn, prevout, privkey, 'ALL', options])
+            privkey_wif = self.ci(Coins.PART).encodeKey(privkey)
-        if coin_type == Coins.PART or self.coin_clients[coin_type]['use_segwit']:
+            refund_sig = self.callcoinrpc(Coins.PART, 'createsignaturewithkey', [refund_txn, prevout, privkey_wif, 'ALL', options])
+        if coin_type in (Coins.DCR, ):
+            witness_stack = [
+                bytes.fromhex(refund_sig),
+                pubkey,
+                (OpCodes.OP_0).to_bytes(1),
+                txn_script]
+            refund_txn = ci.setTxSignature(bytes.fromhex(refund_txn), witness_stack).hex()
+        elif coin_type in (Coins.PART, ) or self.coin_clients[coin_type]['use_segwit']:
             witness_stack = [
                 bytes.fromhex(refund_sig),
                 pubkey,
@@ -3425,11 +3490,11 @@ class BasicSwap(BaseApp):
                 txn_script]
             refund_txn = ci.setTxSignature(bytes.fromhex(refund_txn), witness_stack).hex()
         else:
-            script = format(len(refund_sig) // 2, '02x') + refund_sig
+            script = (len(refund_sig) // 2).to_bytes(1) + bytes.fromhex(refund_sig)
-            script += format(33, '02x') + pubkey.hex()
+            script += (33).to_bytes(1) + pubkey
-            script += format(OpCodes.OP_0, '02x')
+            script += (OpCodes.OP_0).to_bytes(1)
-            script += format(OpCodes.OP_PUSHDATA1, '02x') + format(len(txn_script), '02x') + txn_script.hex()
+            script += (OpCodes.OP_PUSHDATA1).to_bytes(1) + (len(txn_script)).to_bytes(1) + txn_script
-            refund_txn = ci.setTxScriptSig(bytes.fromhex(refund_txn), 0, bytes.fromhex(script)).hex()
+            refund_txn = ci.setTxScriptSig(bytes.fromhex(refund_txn), 0, script)
 
         if coin_type in (Coins.NAV, Coins.DCR):
             # Only checks signature
@@ -3445,8 +3510,12 @@ class BasicSwap(BaseApp):
         if self.debug:
             # Check fee
             if ci.get_connection_type() == 'rpc':
-                refund_txjs = self.callcoinrpc(coin_type, 'decoderawtransaction', [refund_txn])
+                refund_txjs = self.callcoinrpc(coin_type, 'decoderawtransaction', [refund_txn,])
-                if ci.using_segwit() or coin_type in (Coins.PART, ):
+                if coin_type in (Coins.DCR, ):
+                    txsize = len(refund_txn) // 2
+                    self.log.debug('size paid, actual size %d %d', tx_vsize, txsize)
+                    ensure(tx_vsize >= txsize, 'underpaid fee')
+                elif ci.use_tx_vsize():
                     self.log.debug('vsize paid, actual vsize %d %d', tx_vsize, refund_txjs['vsize'])
                     ensure(tx_vsize >= refund_txjs['vsize'], 'underpaid fee')
                 else:
@@ -3490,20 +3559,31 @@ class BasicSwap(BaseApp):
                 tx_type=TxTypes.PTX,
                 script=participate_script,
             )
+            ci = self.ci(offer.coin_to)
+            if ci.watch_blocks_for_scripts() is True:
+                self.addWatchedScript(offer.coin_to, bid_id, ci.getScriptDest(participate_script), TxTypes.PTX)
+                self.setLastHeightCheckedStart(offer.coin_to, bid.initiate_tx.chain_height)
 
         # Bid saved in checkBidState
 
-    def setLastHeightChecked(self, coin_type, tx_height: int) -> int:
+    def setLastHeightCheckedStart(self, coin_type, tx_height: int) -> int:
-        coin_name = self.ci(coin_type).coin_name()
+        ci = self.ci(coin_type)
+        coin_name = ci.coin_name()
         if tx_height < 1:
             tx_height = self.lookupChainHeight(coin_type)
 
-        if len(self.coin_clients[coin_type]['watched_outputs']) == 0:
+        block_header = ci.getBlockHeaderFromHeight(tx_height)
-            self.coin_clients[coin_type]['last_height_checked'] = tx_height
+        block_time = block_header['time']
+        cc = self.coin_clients[coin_type]
+        if len(cc['watched_outputs']) == 0 and len(cc['watched_scripts']) == 0:
+            cc['last_height_checked'] = tx_height
+            cc['block_check_min_time'] = block_time
+            self.setIntKV('block_check_min_time_' + coin_name, block_time)
             self.log.debug('Start checking %s chain at height %d', coin_name, tx_height)
-
+        elif cc['last_height_checked'] > tx_height:
-        if self.coin_clients[coin_type]['last_height_checked'] > tx_height:
+            cc['last_height_checked'] = tx_height
-            self.coin_clients[coin_type]['last_height_checked'] = tx_height
+            cc['block_check_min_time'] = block_time
+            self.setIntKV('block_check_min_time_' + coin_name, block_time)
             self.log.debug('Rewind checking of %s chain to height %d', coin_name, tx_height)
 
         return tx_height
@@ -3511,7 +3591,7 @@ class BasicSwap(BaseApp):
     def addParticipateTxn(self, bid_id: bytes, bid, coin_type, txid_hex: str, vout, tx_height) -> None:
 
         # TODO: Check connection type
-        participate_txn_height = self.setLastHeightChecked(coin_type, tx_height)
+        participate_txn_height = self.setLastHeightCheckedStart(coin_type, tx_height)
 
         if bid.participate_tx is None:
             bid.participate_tx = SwapTx(
@@ -3529,6 +3609,11 @@ class BasicSwap(BaseApp):
 
     def participateTxnConfirmed(self, bid_id: bytes, bid, offer) -> None:
         self.log.debug('participateTxnConfirmed for bid %s', bid_id.hex())
+
+        if bid.debug_ind == DebugTypes.DONT_CONFIRM_PTX:
+            self.log.debug('Not confirming PTX for debugging', bid_id.hex())
+            return
+
         bid.setState(BidStates.SWAP_PARTICIPATING)
         bid.setPTxState(TxStates.TX_CONFIRMED)
 
@@ -3774,9 +3859,9 @@ class BasicSwap(BaseApp):
                     return rv
 
                 # TODO: Timeout waiting for transactions
-                bid_changed = False
+                bid_changed: bool = False
                 a_lock_tx_addr = ci_from.getSCLockScriptAddress(xmr_swap.a_lock_tx_script)
-                lock_tx_chain_info = ci_from.getLockTxHeight(bid.xmr_a_lock_tx.txid, a_lock_tx_addr, bid.amount, bid.chain_a_height_start)
+                lock_tx_chain_info = ci_from.getLockTxHeight(bid.xmr_a_lock_tx.txid, a_lock_tx_addr, bid.amount, bid.chain_a_height_start, vout=bid.xmr_a_lock_tx.vout)
 
                 if lock_tx_chain_info is None:
                     return rv
@@ -3863,7 +3948,7 @@ class BasicSwap(BaseApp):
                     refund_tx = bid.txns[TxTypes.XMR_SWAP_A_LOCK_REFUND]
                     if refund_tx.block_time is None:
                         refund_tx_addr = ci_from.getSCLockScriptAddress(xmr_swap.a_lock_refund_tx_script)
-                        lock_refund_tx_chain_info = ci_from.getLockTxHeight(refund_tx.txid, refund_tx_addr, 0, bid.chain_a_height_start)
+                        lock_refund_tx_chain_info = ci_from.getLockTxHeight(refund_tx.txid, refund_tx_addr, 0, bid.chain_a_height_start, vout=refund_tx.vout)
 
                         if lock_refund_tx_chain_info is not None and lock_refund_tx_chain_info.get('height', 0) > 0:
                             self.setTxBlockInfoFromHeight(ci_from, refund_tx, lock_refund_tx_chain_info['height'])
@@ -3904,14 +3989,14 @@ class BasicSwap(BaseApp):
             return True  # Mark bid for archiving
         if state == BidStates.BID_ACCEPTED:
             # Waiting for initiate txn to be confirmed in 'from' chain
-            initiate_txnid_hex = bid.initiate_tx.txid.hex()
-            p2sh = ci_from.encode_p2sh(bid.initiate_tx.script)
             index = None
             tx_height = None
+            initiate_txnid_hex = bid.initiate_tx.txid.hex()
             last_initiate_txn_conf = bid.initiate_tx.conf
             ci_from = self.ci(coin_from)
             if coin_from == Coins.PART:  # Has txindex
                 try:
+                    p2sh = ci_from.encode_p2sh(bid.initiate_tx.script)
                     initiate_txn = self.callcoinrpc(coin_from, 'getrawtransaction', [initiate_txnid_hex, True])
                     # Verify amount
                     vout = getVoutByAddress(initiate_txn, p2sh)
@@ -3932,24 +4017,29 @@ class BasicSwap(BaseApp):
                     dest_script = ci_from.getScriptDest(bid.initiate_tx.script)
                     addr = ci_from.encodeScriptDest(dest_script)
                 else:
-                    addr = p2sh
+                    addr = ci_from.encode_p2sh(bid.initiate_tx.script)
 
-                found = ci_from.getLockTxHeight(bytes.fromhex(initiate_txnid_hex), addr, bid.amount, bid.chain_a_height_start, find_index=True)
+                found = ci_from.getLockTxHeight(bid.initiate_tx.txid, addr, bid.amount, bid.chain_a_height_start, find_index=True, vout=bid.initiate_tx.vout)
+                index = None
                 if found:
                     bid.initiate_tx.conf = found['depth']
-                    index = found['index']
+                    if 'index' in found:
+                        index = found['index']
                     tx_height = found['height']
 
             if bid.initiate_tx.conf != last_initiate_txn_conf:
                 save_bid = True
 
+            if bid.initiate_tx.vout is None and index is not None:
+                bid.initiate_tx.vout = index
+                save_bid = True
+
             if bid.initiate_tx.conf is not None:
                 self.log.debug('initiate_txnid %s confirms %d', initiate_txnid_hex, bid.initiate_tx.conf)
 
-                if bid.initiate_tx.vout is None and tx_height > 0:
+                if (last_initiate_txn_conf is None or last_initiate_txn_conf < 1) and tx_height > 0:
-                    bid.initiate_tx.vout = index
                     # Start checking for spends of initiate_txn before fully confirmed
-                    bid.initiate_tx.chain_height = self.setLastHeightChecked(coin_from, tx_height)
+                    bid.initiate_tx.chain_height = self.setLastHeightCheckedStart(coin_from, tx_height)
                     self.setTxBlockInfoFromHeight(ci_from, bid.initiate_tx, tx_height)
 
                     self.addWatchedOutput(coin_from, bid_id, initiate_txnid_hex, bid.initiate_tx.vout, BidStates.SWAP_INITIATED)
@@ -3978,17 +4068,22 @@ class BasicSwap(BaseApp):
 
             ci_to = self.ci(coin_to)
             participate_txid = None if bid.participate_tx is None or bid.participate_tx.txid is None else bid.participate_tx.txid
-            found = ci_to.getLockTxHeight(participate_txid, addr, bid.amount_to, bid.chain_b_height_start, find_index=True)
+            participate_txvout = None if bid.participate_tx is None or bid.participate_tx.vout is None else bid.participate_tx.vout
+            found = ci_to.getLockTxHeight(participate_txid, addr, bid.amount_to, bid.chain_b_height_start, find_index=True, vout=participate_txvout)
             if found:
+                index = found.get('index', participate_txvout)
                 if bid.participate_tx.conf != found['depth']:
                     save_bid = True
+                if bid.participate_tx.conf is None and bid.participate_tx.state != TxStates.TX_SENT:
+                    txid = found.get('txid', None if participate_txid is None else participate_txid.hex())
+                    self.log.debug('Found bid %s participate txn %s in chain %s', bid_id.hex(), txid, Coins(coin_to).name)
+                    self.addParticipateTxn(bid_id, bid, coin_to, txid, index, found['height'])
+
+                    # Only update tx state if tx hasn't already been seen
+                    if bid.participate_tx.state is None or bid.participate_tx.state < TxStates.TX_SENT:
+                        bid.setPTxState(TxStates.TX_SENT)
+
                 bid.participate_tx.conf = found['depth']
-                index = found['index']
-                if bid.participate_tx is None or bid.participate_tx.txid is None:
-                    self.log.debug('Found bid %s participate txn %s in chain %s', bid_id.hex(), found['txid'], Coins(coin_to).name)
-                    self.addParticipateTxn(bid_id, bid, coin_to, found['txid'], found['index'], found['height'])
-                    bid.setPTxState(TxStates.TX_SENT)
-                    save_bid = True
                 if found['height'] > 0 and bid.participate_tx.block_height is None:
                     self.setTxBlockInfoFromHeight(ci_to, bid.participate_tx, found['height'])
 
@@ -4047,13 +4142,17 @@ class BasicSwap(BaseApp):
                 self.logEvent(Concepts.BID, bid.bid_id, EventLogTypes.PTX_REFUND_PUBLISHED, '', None)
                 # State will update when spend is detected
             except Exception as ex:
-                if 'non-BIP68-final' not in str(ex) and 'non-final' not in str(ex):
+                if 'non-BIP68-final' not in str(ex) and 'non-final' not in str(ex) and 'locks on inputs not met' not in str(ex):
                     self.log.warning('Error trying to submit participate refund txn: %s', str(ex))
         return False  # Bid is still active
 
     def extractSecret(self, coin_type, bid, spend_in):
         try:
-            if coin_type == Coins.PART or self.coin_clients[coin_type]['use_segwit']:
+            if coin_type in (Coins.DCR, ):
+                script_sig = spend_in['scriptSig']['asm'].split(' ')
+                ensure(len(script_sig) == 5, 'Bad witness size')
+                return bytes.fromhex(script_sig[2])
+            elif coin_type in (Coins.PART, ) or self.coin_clients[coin_type]['use_segwit']:
                 ensure(len(spend_in['txinwitness']) == 5, 'Bad witness size')
                 return bytes.fromhex(spend_in['txinwitness'][2])
             else:
@@ -4064,7 +4163,7 @@ class BasicSwap(BaseApp):
             return None
 
     def addWatchedOutput(self, coin_type, bid_id, txid_hex, vout, tx_type, swap_type=None):
-        self.log.debug('Adding watched output %s bid %s tx %s type %s', coin_type, bid_id.hex(), txid_hex, tx_type)
+        self.log.debug('Adding watched output %s bid %s tx %s type %s', Coins(coin_type).name, bid_id.hex(), txid_hex, tx_type)
 
         watched = self.coin_clients[coin_type]['watched_outputs']
 
@@ -4085,7 +4184,29 @@ class BasicSwap(BaseApp):
                 del self.coin_clients[coin_type]['watched_outputs'][i]
                 self.log.debug('Removed watched output %s %s %s', Coins(coin_type).name, bid_id.hex(), wo.txid_hex)
 
-    def initiateTxnSpent(self, bid_id: bytes, spend_txid: str, spend_n: int, spend_txn):
+    def addWatchedScript(self, coin_type, bid_id, script, tx_type, swap_type=None):
+        self.log.debug('Adding watched script %s bid %s type %s', Coins(coin_type).name, bid_id.hex(), tx_type)
+
+        watched = self.coin_clients[coin_type]['watched_scripts']
+
+        for ws in watched:
+            if ws.bid_id == bid_id and ws.tx_type == tx_type and ws.script == script:
+                self.log.debug('Script already being watched.')
+                return
+
+        watched.append(WatchedScript(bid_id, script, tx_type, swap_type))
+
+    def removeWatchedScript(self, coin_type, bid_id: bytes, script: bytes) -> None:
+        # Remove all for bid if txid is None
+        self.log.debug('removeWatchedScript %s %s', Coins(coin_type).name, bid_id.hex())
+        old_len = len(self.coin_clients[coin_type]['watched_scripts'])
+        for i in range(old_len - 1, -1, -1):
+            ws = self.coin_clients[coin_type]['watched_scripts'][i]
+            if ws.bid_id == bid_id and (script is None or ws.script == script):
+                del self.coin_clients[coin_type]['watched_scripts'][i]
+                self.log.debug('Removed watched script %s %s', Coins(coin_type).name, bid_id.hex())
+
+    def initiateTxnSpent(self, bid_id: bytes, spend_txid: str, spend_n: int, spend_txn) -> None:
         self.log.debug('Bid %s initiate txn spent by %s %d', bid_id.hex(), spend_txid, spend_n)
 
         if bid_id in self.swaps_in_progress:
@@ -4112,7 +4233,7 @@ class BasicSwap(BaseApp):
             self.removeWatchedOutput(coin_from, bid_id, bid.initiate_tx.txid.hex())
             self.saveBid(bid_id, bid)
 
-    def participateTxnSpent(self, bid_id: bytes, spend_txid: str, spend_n: int, spend_txn):
+    def participateTxnSpent(self, bid_id: bytes, spend_txid: str, spend_n: int, spend_txn) -> None:
         self.log.debug('Bid %s participate txn spent by %s %d', bid_id.hex(), spend_txid, spend_n)
 
         # TODO: More SwapTypes
@@ -4268,7 +4389,7 @@ class BasicSwap(BaseApp):
             session.remove()
             self.mxDB.release()
 
-    def processSpentOutput(self, coin_type, watched_output, spend_txid_hex, spend_n, spend_txn):
+    def processSpentOutput(self, coin_type, watched_output, spend_txid_hex, spend_n, spend_txn) -> None:
         if watched_output.swap_type == SwapTypes.XMR_SWAP:
             if watched_output.tx_type == TxTypes.XMR_SWAP_A_LOCK:
                 self.process_XMR_SWAP_A_LOCK_tx_spend(watched_output.bid_id, spend_txid_hex, spend_txn['hex'])
@@ -4283,13 +4404,65 @@ class BasicSwap(BaseApp):
         else:
             self.initiateTxnSpent(watched_output.bid_id, spend_txid_hex, spend_n, spend_txn)
 
+    def processFoundScript(self, coin_type, watched_script, txid: bytes, vout: int) -> None:
+        if watched_script.tx_type == TxTypes.PTX:
+            if watched_script.bid_id in self.swaps_in_progress:
+                bid = self.swaps_in_progress[watched_script.bid_id][0]
+
+                bid.participate_tx.txid = txid
+                bid.participate_tx.vout = vout
+                bid.setPTxState(TxStates.TX_IN_CHAIN)
+
+                self.saveBid(watched_script.bid_id, bid)
+            else:
+                self.log.warning('Could not find active bid for found watched script: {}'.format(watched_script.bid_id.hex()))
+        else:
+            self.log.warning('Unknown found watched script tx type for bid {}'.format(watched_script.bid_id.hex()))
+
+        self.removeWatchedScript(coin_type, watched_script.bid_id, watched_script.script)
+
+    def checkNewBlock(self, coin_type, c):
+        pass
+
+    def haveCheckedPrevBlock(self, ci, c, block, session=None) -> bool:
+        previousblockhash = bytes.fromhex(block['previousblockhash'])
+        try:
+            use_session = self.openSession(session)
+
+            q = use_session.execute('SELECT COUNT(*) FROM checkedblocks WHERE block_hash = :block_hash', {'block_hash': previousblockhash}).first()
+            if q[0] > 0:
+                return True
+
+        finally:
+            if session is None:
+                self.closeSession(use_session, commit=False)
+
+        return False
+
+    def updateCheckedBlock(self, ci, cc, block, session=None) -> None:
+        now: int = self.getTime()
+        try:
+            use_session = self.openSession(session)
+
+            block_height = int(block['height'])
+            if cc['last_height_checked'] != block_height:
+                cc['last_height_checked'] = block_height
+                self.setIntKVInSession('last_height_checked_' + ci.coin_name().lower(), block_height, use_session)
+
+            query = '''INSERT INTO checkedblocks (created_at, coin_type, block_height, block_hash, block_time)
+                       VALUES (:now, :coin_type, :block_height, :block_hash, :block_time)'''
+            use_session.execute(query, {'now': now, 'coin_type': int(ci.coin_type()), 'block_height': block_height, 'block_hash': bytes.fromhex(block['hash']), 'block_time': int(block['time'])})
+
+        finally:
+            if session is None:
+                self.closeSession(use_session)
+
     def checkForSpends(self, coin_type, c):
         # assert (self.mxDB.locked())
         self.log.debug('checkForSpends %s', Coins(coin_type).name)
 
         # TODO: Check for spends on watchonly txns where possible
-
+        if self.coin_clients[coin_type].get('have_spent_index', False):
-        if 'have_spent_index' in self.coin_clients[coin_type] and self.coin_clients[coin_type]['have_spent_index']:
             # TODO: batch getspentinfo
             for o in c['watched_outputs']:
                 found_spend = None
@@ -4304,39 +4477,56 @@ class BasicSwap(BaseApp):
                     spend_n = found_spend['index']
                     spend_txn = self.callcoinrpc(Coins.PART, 'getrawtransaction', [spend_txid, True])
                     self.processSpentOutput(coin_type, o, spend_txid, spend_n, spend_txn)
-        else:
+            return
-            ci = self.ci(coin_type)
+
-            chain_blocks = ci.getChainHeight()
+        ci = self.ci(coin_type)
-            last_height_checked = c['last_height_checked']
+        chain_blocks = ci.getChainHeight()
-            self.log.debug('chain_blocks, last_height_checked %s %s', chain_blocks, last_height_checked)
+        last_height_checked: int = c['last_height_checked']
-            while last_height_checked < chain_blocks:
+        block_check_min_time: int = c['block_check_min_time']
-                block_hash = self.callcoinrpc(coin_type, 'getblockhash', [last_height_checked + 1])
+        self.log.debug('chain_blocks, last_height_checked %d %d', chain_blocks, last_height_checked)
-                try:
+
-                    block = ci.getBlockWithTxns(block_hash)
+        while last_height_checked < chain_blocks:
-                except Exception as e:
+            block_hash = ci.rpc('getblockhash', [last_height_checked + 1])
-                    if 'Block not available (pruned data)' in str(e):
+            try:
-                        # TODO: Better solution?
+                block = ci.getBlockWithTxns(block_hash)
-                        bci = self.callcoinrpc(coin_type, 'getblockchaininfo')
+            except Exception as e:
-                        self.log.error('Coin %s last_height_checked %d set to pruneheight %d', self.ci(coin_type).coin_name(), last_height_checked, bci['pruneheight'])
+                if 'Block not available (pruned data)' in str(e):
-                        last_height_checked = bci['pruneheight']
+                    # TODO: Better solution?
-                        continue
+                    bci = self.callcoinrpc(coin_type, 'getblockchaininfo')
-                    else:
+                    self.log.error('Coin %s last_height_checked %d set to pruneheight %d', self.ci(coin_type).coin_name(), last_height_checked, bci['pruneheight'])
-                        self.logException(f'getblock error {e}')
+                    last_height_checked = bci['pruneheight']
-                        break
+                    continue
+                else:
+                    self.logException(f'getblock error {e}')
+                    break
+
+            if block_check_min_time > block['time'] or last_height_checked < 1:
+                pass
+            elif not self.haveCheckedPrevBlock(ci, c, block):
+                last_height_checked -= 1
+                self.log.debug('Have not seen previousblockhash {} for block {}'.format(block['previousblockhash'], block['hash']))
+                continue
+
+            for tx in block['tx']:
+                for s in c['watched_scripts']:
+                    for i, txo in enumerate(tx['vout']):
+                        if 'scriptPubKey' in txo and 'hex' in txo['scriptPubKey']:
+                            # TODO: Optimise by loading rawtx in CTransaction
+                            if bytes.fromhex(txo['scriptPubKey']['hex']) == s.script:
+                                self.log.debug('Found script from search for bid %s: %s %d', s.bid_id.hex(), tx['txid'], i)
+                                self.processFoundScript(coin_type, s, bytes.fromhex(tx['txid']), i)
 
-                for tx in block['tx']:
+                for o in c['watched_outputs']:
                     for i, inp in enumerate(tx['vin']):
-                        for o in c['watched_outputs']:
+                        inp_txid = inp.get('txid', None)
-                            inp_txid = inp.get('txid', None)
+                        if inp_txid is None:  # Coinbase
-                            if inp_txid is None:  # Coinbase
+                            continue
-                                continue
+                        if inp_txid == o.txid_hex and inp['vout'] == o.vout:
-                            if inp_txid == o.txid_hex and inp['vout'] == o.vout:
+                            self.log.debug('Found spend from search %s %d in %s %d', o.txid_hex, o.vout, tx['txid'], i)
-                                self.log.debug('Found spend from search %s %d in %s %d', o.txid_hex, o.vout, tx['txid'], i)
+                            self.processSpentOutput(coin_type, o, tx['txid'], i, tx)
-                                self.processSpentOutput(coin_type, o, tx['txid'], i, tx)
+
-                last_height_checked += 1
+            last_height_checked += 1
-            if c['last_height_checked'] != last_height_checked:
+            self.updateCheckedBlock(ci, c, block)
-                c['last_height_checked'] = last_height_checked
-                self.setIntKV('last_height_checked_' + ci.coin_name().lower(), last_height_checked)
 
     def expireMessages(self) -> None:
         if self._is_locked is True:
@@ -4572,7 +4762,7 @@ class BasicSwap(BaseApp):
             return
         offer_data.ParseFromString(offer_bytes)
 
-        # Validate data
+        # Validate offer data
         now: int = self.getTime()
         coin_from = Coins(offer_data.coin_from)
         ci_from = self.ci(coin_from)
@@ -4839,7 +5029,7 @@ class BasicSwap(BaseApp):
         bid_data = BidMessage()
         bid_data.ParseFromString(bid_bytes)
 
-        # Validate data
+        # Validate bid data
         ensure(bid_data.protocol_version >= MINPROTO_VERSION_SECRET_HASH, 'Invalid protocol version')
         ensure(len(bid_data.offer_msg_id) == 28, 'Bad offer_id length')
 
@@ -4899,6 +5089,9 @@ class BasicSwap(BaseApp):
                 chain_a_height_start=ci_from.getChainHeight(),
                 chain_b_height_start=ci_to.getChainHeight(),
             )
+
+            if len(bid_data.pkhash_buyer_to) > 0:
+                bid.pkhash_buyer_to = bid_data.pkhash_buyer_to
         else:
             ensure(bid.state == BidStates.BID_SENT, 'Wrong bid state: {}'.format(BidStates(bid.state).name))
             bid.created_at = msg['sent']
@@ -4952,33 +5145,29 @@ class BasicSwap(BaseApp):
 
         use_csv = True if offer.lock_type < TxLockTypes.ABS_LOCK_BLOCKS else False
 
-        # TODO: Verify script without decoding?
+        if coin_from in (Coins.DCR, ):
-        decoded_script = self.callcoinrpc(Coins.PART, 'decodescript', [bid_accept_data.contract_script.hex()])
+            op_hash = OpCodes.OP_SHA256_DECRED
-        lock_check_op = 'OP_CHECKSEQUENCEVERIFY' if use_csv else 'OP_CHECKLOCKTIMEVERIFY'
+        else:
-        prog = re.compile(r'OP_IF OP_SIZE 32 OP_EQUALVERIFY OP_SHA256 (\w+) OP_EQUALVERIFY OP_DUP OP_HASH160 (\w+) OP_ELSE (\d+) {} OP_DROP OP_DUP OP_HASH160 (\w+) OP_ENDIF OP_EQUALVERIFY OP_CHECKSIG'.format(lock_check_op))
+            op_hash = OpCodes.OP_SHA256
-        rr = prog.match(decoded_script['asm'])
+        op_lock = OpCodes.OP_CHECKSEQUENCEVERIFY if use_csv else OpCodes.OP_CHECKLOCKTIMEVERIFY
-        if not rr:
+        script_valid, script_hash, script_pkhash1, script_lock_val, script_pkhash2 = atomic_swap_1.verifyContractScript(bid_accept_data.contract_script, op_lock=op_lock, op_hash=op_hash)
+        if not script_valid:
             raise ValueError('Bad script')
-        scriptvalues = rr.groups()
 
-        ensure(len(scriptvalues[0]) == 64, 'Bad secret_hash length')
+        ensure(script_pkhash1 == bid.pkhash_buyer, 'pkhash_buyer mismatch')
-        ensure(bytes.fromhex(scriptvalues[1]) == bid.pkhash_buyer, 'pkhash_buyer mismatch')
 
-        script_lock_value = int(scriptvalues[2])
         if use_csv:
             expect_sequence = ci_from.getExpectedSequence(offer.lock_type, offer.lock_value)
-            ensure(script_lock_value == expect_sequence, 'sequence mismatch')
+            ensure(script_lock_val == expect_sequence, 'sequence mismatch')
         else:
             if offer.lock_type == TxLockTypes.ABS_LOCK_BLOCKS:
                 block_header_from = ci_from.getBlockHeaderAt(now)
                 chain_height_at_bid_creation = block_header_from['height']
-                ensure(script_lock_value <= chain_height_at_bid_creation + offer.lock_value + atomic_swap_1.ABS_LOCK_BLOCKS_LEEWAY, 'script lock height too high')
+                ensure(script_lock_val <= chain_height_at_bid_creation + offer.lock_value + atomic_swap_1.ABS_LOCK_BLOCKS_LEEWAY, 'script lock height too high')
-                ensure(script_lock_value >= chain_height_at_bid_creation + offer.lock_value - atomic_swap_1.ABS_LOCK_BLOCKS_LEEWAY, 'script lock height too low')
+                ensure(script_lock_val >= chain_height_at_bid_creation + offer.lock_value - atomic_swap_1.ABS_LOCK_BLOCKS_LEEWAY, 'script lock height too low')
             else:
-                ensure(script_lock_value <= now + offer.lock_value + atomic_swap_1.INITIATE_TX_TIMEOUT, 'script lock time too high')
+                ensure(script_lock_val <= now + offer.lock_value + atomic_swap_1.INITIATE_TX_TIMEOUT, 'script lock time too high')
-                ensure(script_lock_value >= now + offer.lock_value - atomic_swap_1.ABS_LOCK_TIME_LEEWAY, 'script lock time too low')
+                ensure(script_lock_val >= now + offer.lock_value - atomic_swap_1.ABS_LOCK_TIME_LEEWAY, 'script lock time too low')
-
-        ensure(len(scriptvalues[3]) == 40, 'pkhash_refund bad length')
 
         ensure(self.countMessageLinks(Concepts.BID, bid_id, MessageTypes.BID_ACCEPT) == 0, 'Bid already accepted')
 
@@ -4991,7 +5180,12 @@ class BasicSwap(BaseApp):
             txid=bid_accept_data.initiate_txid,
             script=bid_accept_data.contract_script,
         )
-        bid.pkhash_seller = bytes.fromhex(scriptvalues[3])
+
+        if len(bid_accept_data.pkhash_seller) == 20:
+            bid.pkhash_seller = bid_accept_data.pkhash_seller
+        else:
+            bid.pkhash_seller = script_pkhash2
+
         bid.setState(BidStates.BID_ACCEPTED)
         bid.setITxState(TxStates.TX_NONE)
 
@@ -5322,7 +5516,7 @@ class BasicSwap(BaseApp):
 
         reverse_bid: bool = self.is_reverse_ads_bid(offer.coin_from)
         coin_from = Coins(offer.coin_to if reverse_bid else offer.coin_from)
-        self.setLastHeightChecked(coin_from, bid.chain_a_height_start)
+        self.setLastHeightCheckedStart(coin_from, bid.chain_a_height_start)
         self.addWatchedOutput(coin_from, bid.bid_id, bid.xmr_a_lock_tx.txid.hex(), bid.xmr_a_lock_tx.vout, TxTypes.XMR_SWAP_A_LOCK, SwapTypes.XMR_SWAP)
 
         lock_refund_vout = self.ci(coin_from).getLockRefundTxSwapOutput(xmr_swap)
@@ -6351,9 +6545,9 @@ class BasicSwap(BaseApp):
 
             if now - self._last_checked_watched >= self.check_watched_seconds:
                 for k, c in self.coin_clients.items():
-                    if k == Coins.PART_ANON or k == Coins.PART_BLIND:
+                    if k == Coins.PART_ANON or k == Coins.PART_BLIND or k == Coins.LTC_MWEB:
                         continue
-                    if len(c['watched_outputs']) > 0:
+                    if len(c['watched_outputs']) > 0 or len(c['watched_scripts']):
                         self.checkForSpends(k, c)
                 self._last_checked_watched = now
 

basicswap/basicswap_util.py

@@ -202,6 +202,7 @@ class DebugTypes(IntEnum):
     SEND_LOCKED_XMR = auto()
     B_LOCK_TX_MISSED_SEND = auto()
     DUPLICATE_ACTIONS = auto()
+    DONT_CONFIRM_PTX = auto()
 
 
 class NotificationTypes(IntEnum):

basicswap/db.py

@@ -11,7 +11,7 @@ from enum import IntEnum, auto
 from sqlalchemy.ext.declarative import declarative_base
 
 
-CURRENT_DB_VERSION = 23
+CURRENT_DB_VERSION = 24
 CURRENT_DB_DATA_VERSION = 4
 Base = declarative_base()
 
@@ -127,6 +127,7 @@ class Bid(Base):
     amount_to = sa.Column(sa.BigInteger)  # amount * offer.rate
 
     pkhash_buyer = sa.Column(sa.LargeBinary)
+    pkhash_buyer_to = sa.Column(sa.LargeBinary)  # Used for the ptx if coin pubkey hashes differ
     amount = sa.Column(sa.BigInteger)
     rate = sa.Column(sa.BigInteger)
 
@@ -522,3 +523,14 @@ class MessageLink(Base):
     msg_type = sa.Column(sa.Integer)
     msg_sequence = sa.Column(sa.Integer)
     msg_id = sa.Column(sa.LargeBinary)
+
+
+class CheckedBlock(Base):
+    __tablename__ = 'checkedblocks'
+
+    record_id = sa.Column(sa.Integer, primary_key=True, autoincrement=True)
+    created_at = sa.Column(sa.BigInteger)
+    coin_type = sa.Column(sa.Integer)
+    block_height = sa.Column(sa.Integer)
+    block_hash = sa.Column(sa.LargeBinary)
+    block_time = sa.Column(sa.BigInteger)

basicswap/db_upgrades.py

@@ -300,6 +300,18 @@ def upgradeDatabase(self, db_version):
         elif current_version == 22:
             db_version += 1
             session.execute('ALTER TABLE offers ADD COLUMN amount_to INTEGER')
+        elif current_version == 23:
+            db_version += 1
+            session.execute('''
+                CREATE TABLE checkedblocks (
+                    record_id INTEGER NOT NULL,
+                    created_at BIGINT,
+                    coin_type INTEGER,
+                    block_height INTEGER,
+                    block_hash BLOB,
+                    block_time INTEGER,
+                    PRIMARY KEY (record_id))''')
+            session.execute('ALTER TABLE bids ADD COLUMN pkhash_buyer_to BLOB')
         if current_version != db_version:
             self.db_version = db_version
             self.setIntKVInSession('db_version', db_version, session)

basicswap/db_util.py

@@ -52,5 +52,7 @@ def remove_expired_data(self, time_offset: int = 0):
         if num_offers > 0 or num_bids > 0:
             self.log.info('Removed data for {} expired offer{} and {} bid{}.'.format(num_offers, 's' if num_offers != 1 else '', num_bids, 's' if num_bids != 1 else ''))
 
+        session.execute('DELETE FROM checkedblocks WHERE created_at <= :expired_at', {'expired_at': now - time_offset})
+
     finally:
         self.closeSession(session)

basicswap/interface/base.py

@@ -19,6 +19,9 @@ from basicswap.util import (
     format_amount,
     TemporaryError,
 )
+from basicswap.util.crypto import (
+    hash160,
+)
 from basicswap.util.ecc import (
     ep,
     getSecretInt,
@@ -37,6 +40,10 @@ class Curves(IntEnum):
 
 
 class CoinInterface:
+    @staticmethod
+    def watch_blocks_for_scripts() -> bool:
+        return False
+
     def __init__(self, network):
         self.setDefaults()
         self._network = network
@@ -101,6 +108,10 @@ class CoinInterface:
     def has_segwit(self) -> bool:
         return chainparams[self.coin_type()].get('has_segwit', True)
 
+    def use_p2shp2wsh(self) -> bool:
+        # p2sh-p2wsh
+        return False
+
     def is_transient_error(self, ex) -> bool:
         if isinstance(ex, TemporaryError):
             return True
@@ -128,6 +139,16 @@ class CoinInterface:
     def walletRestoreHeight(self) -> int:
         return self._restore_height
 
+    def get_connection_type(self):
+        return self._connection_type
+
+    def using_segwit(self) -> bool:
+        # Using btc native segwit
+        return self._use_segwit
+
+    def use_tx_vsize(self) -> bool:
+        return self._use_segwit
+
 
 class Secp256k1Interface(CoinInterface):
     @staticmethod
@@ -137,9 +158,12 @@ class Secp256k1Interface(CoinInterface):
     def getNewSecretKey(self) -> bytes:
         return i2b(getSecretInt())
 
-    def getPubkey(self, privkey):
+    def getPubkey(self, privkey: bytes) -> bytes:
         return PublicKey.from_secret(privkey).format()
 
+    def pkh(self, pubkey: bytes) -> bytes:
+        return hash160(pubkey)
+
     def verifyKey(self, k: bytes) -> bool:
         i = b2i(k)
         return (i < ep.o and i > 0)

basicswap/interface/btc.py

@@ -66,8 +66,8 @@ from basicswap.contrib.test_framework.messages import (
     CTxIn,
     CTxInWitness,
     CTxOut,
-    uint256_from_str)
+    uint256_from_str,
-
+)
 from basicswap.contrib.test_framework.script import (
     CScript, CScriptOp,
     OP_IF, OP_ELSE, OP_ENDIF,
@@ -231,17 +231,6 @@ class BTCInterface(Secp256k1Interface):
 
         return len(wallets)
 
-    def using_segwit(self) -> bool:
-        # Using btc native segwit
-        return self._use_segwit
-
-    def use_p2shp2wsh(self) -> bool:
-        # p2sh-p2wsh
-        return False
-
-    def get_connection_type(self):
-        return self._connection_type
-
     def open_rpc(self, wallet=None):
         return openrpc(self._rpcport, self._rpcauth, wallet=wallet, host=self._rpc_host)
 
@@ -1163,7 +1152,7 @@ class BTCInterface(Secp256k1Interface):
         lock_tx_dest = self.getScriptDest(lock_script)
         return self.encodeScriptDest(lock_tx_dest)
 
-    def getLockTxHeight(self, txid, dest_address, bid_amount, rescan_from, find_index: bool = False):
+    def getLockTxHeight(self, txid, dest_address, bid_amount, rescan_from, find_index: bool = False, vout: int = -1):
         # Add watchonly address and rescan if required
 
         if not self.isAddressMine(dest_address, or_watch_only=True):
@@ -1509,7 +1498,7 @@ class BTCInterface(Secp256k1Interface):
             return {'txid': txid_hex, 'amount': 0, 'height': rv['blockheight']}
         return None
 
-    def createRedeemTxn(self, prevout, output_addr: str, output_value: int) -> str:
+    def createRedeemTxn(self, prevout, output_addr: str, output_value: int, txn_script: bytes = None) -> str:
         tx = CTransaction()
         tx.nVersion = self.txVersion()
         prev_txid = uint256_from_str(bytes.fromhex(prevout['txid'])[::-1])
@@ -1520,7 +1509,7 @@ class BTCInterface(Secp256k1Interface):
         tx.rehash()
         return tx.serialize().hex()
 
-    def createRefundTxn(self, prevout, output_addr: str, output_value: int, locktime: int, sequence: int) -> str:
+    def createRefundTxn(self, prevout, output_addr: str, output_value: int, locktime: int, sequence: int, txn_script: bytes = None) -> str:
         tx = CTransaction()
         tx.nVersion = self.txVersion()
         tx.nLockTime = locktime

basicswap/interface/dcr/dcr.py

@@ -15,6 +15,9 @@ from basicswap.basicswap_util import (
     TxLockTypes
 )
 from basicswap.chainparams import Coins
+from basicswap.contrib.test_framework.messages import (
+    uint256_from_str,
+)
 from basicswap.interface.btc import Secp256k1Interface
 from basicswap.util import (
     ensure,
@@ -34,8 +37,22 @@ from basicswap.util.script import (
 from basicswap.util.extkey import ExtKeyPair
 from basicswap.util.integer import encode_varint
 from basicswap.interface.dcr.rpc import make_rpc_func
-from .messages import CTransaction, CTxOut, SigHashType, TxSerializeType
+from .messages import (
-from .script import push_script_data, OP_HASH160, OP_EQUAL, OP_DUP, OP_EQUALVERIFY, OP_CHECKSIG
+    CTransaction,
+    CTxIn,
+    CTxOut,
+    COutPoint,
+    SigHashType,
+    TxSerializeType,
+)
+from .script import (
+    push_script_data,
+    OP_HASH160,
+    OP_EQUAL,
+    OP_DUP,
+    OP_EQUALVERIFY,
+    OP_CHECKSIG,
+)
 
 from coincurve.keys import (
     PrivateKey,
@@ -124,6 +141,20 @@ def DCRSignatureHash(sign_script: bytes, hash_type: SigHashType, tx: CTransactio
     return blake256(hash_buffer)
 
 
+def extract_sig_and_pk(sig_script: bytes) -> (bytes, bytes):
+    sig = None
+    pk = None
+    o: int = 0
+    num_bytes = sig_script[o]
+    o += 1
+    sig = sig_script[o: o + num_bytes]
+    o += num_bytes
+    num_bytes = sig_script[o]
+    o += 1
+    pk = sig_script[o: o + num_bytes]
+    return sig, pk
+
+
 class DCRInterface(Secp256k1Interface):
 
     @staticmethod
@@ -168,6 +199,10 @@ class DCRInterface(Secp256k1Interface):
             return secondsLocked | SEQUENCE_LOCKTIME_TYPE_FLAG
         raise ValueError('Unknown lock type')
 
+    @staticmethod
+    def watch_blocks_for_scripts() -> bool:
+        return True
+
     def __init__(self, coin_settings, network, swap_client=None):
         super().__init__(network)
         self._rpc_host = coin_settings.get('rpchost', '127.0.0.1')
@@ -183,7 +218,11 @@ class DCRInterface(Secp256k1Interface):
         self.blocks_confirmed = coin_settings['blocks_confirmed']
         self.setConfTarget(coin_settings['conf_target'])
 
-        self._use_segwit = coin_settings['use_segwit']
+        self._use_segwit = True  # Decred is natively segwit
+        self._connection_type = coin_settings['connection_type']
+
+    def use_tx_vsize(self) -> bool:
+        return False
 
     def pkh(self, pubkey: bytes) -> bytes:
         return ripemd160(blake256(pubkey))
@@ -235,9 +274,6 @@ class DCRInterface(Secp256k1Interface):
     def getBlockchainInfo(self):
         return self.rpc('getblockchaininfo')
 
-    def using_segwit(self) -> bool:
-        return self._use_segwit
-
     def getWalletInfo(self):
         rv = {}
         rv = self.rpc_wallet('getinfo')
@@ -276,6 +312,13 @@ class DCRInterface(Secp256k1Interface):
             raise ValueError('Checksum mismatch')
         return key[2], key[3:]
 
+    def encodeKey(self, key_bytes: bytes) -> str:
+        wif_prefix = self.chainparams_network()['key_prefix']
+        key_type = 0  # STEcdsaSecp256k1
+        b = wif_prefix.to_bytes(2, 'big') + key_type.to_bytes(1) + key_bytes
+        b += blake256(b)[:4]
+        return b58encode(b)
+
     def loadTx(self, tx_bytes: bytes) -> CTransaction:
         tx = CTransaction()
         tx.deserialize(tx_bytes)
@@ -288,14 +331,21 @@ class DCRInterface(Secp256k1Interface):
         eck = PrivateKey(key_bytes)
         return eck.sign(sig_hash, hasher=None) + bytes((SigHashType.SigHashAll,))
 
-    def setTxSignature(self, tx_bytes: bytes, stack, txi: int = 0) -> bytes:
+    def setTxSignatureScript(self, tx_bytes: bytes, script: bytes, txi: int = 0) -> bytes:
         tx = self.loadTx(tx_bytes)
 
+        tx.vin[txi].signature_script = script
+        return tx.serialize()
+
+    def setTxSignature(self, tx_bytes: bytes, stack, txi: int = 0) -> bytes:
+        tx = self.loadTx(tx_bytes)
         script_data = bytearray()
         for data in stack:
             push_script_data(script_data, data)
 
         tx.vin[txi].signature_script = script_data
+        test_ser = tx.serialize()
+        test_tx = self.loadTx(test_ser)
 
         return tx.serialize()
 
@@ -310,6 +360,20 @@ class DCRInterface(Secp256k1Interface):
 
         return sig.hex()
 
+    def verifyTxSig(self, tx_bytes: bytes, sig: bytes, K: bytes, input_n: int, prevout_script: bytes, prevout_value: int) -> bool:
+        tx = self.loadTx(tx_bytes)
+
+        sig_hash = DCRSignatureHash(prevout_script, SigHashType.SigHashAll, tx, input_n)
+        pubkey = PublicKey(K)
+        return pubkey.verify(sig[: -1], sig_hash, hasher=None)  # Pop the hashtype byte
+
+    def getTxid(self, tx) -> bytes:
+        if isinstance(tx, str):
+            tx = bytes.fromhex(tx)
+        if isinstance(tx, bytes):
+            tx = self.loadTx(tx)
+        return tx.TxHash()
+
     def getScriptDest(self, script: bytes) -> bytes:
         # P2SH
         script_hash = self.pkh(script)
@@ -323,7 +387,6 @@ class DCRInterface(Secp256k1Interface):
 
     def getPubkeyHashDest(self, pkh: bytes) -> bytes:
         # P2PKH
-
         assert len(pkh) == 20
         return OP_DUP.to_bytes(1) + OP_HASH160.to_bytes(1) + len(pkh).to_bytes(1) + pkh + OP_EQUALVERIFY.to_bytes(1) + OP_CHECKSIG.to_bytes(1)
 
@@ -424,7 +487,7 @@ class DCRInterface(Secp256k1Interface):
         return self.rpc_wallet('sendtoaddress', params)
 
     def isAddressMine(self, address: str, or_watch_only: bool = False) -> bool:
-        addr_info = self.rpc('validateaddress', [address])
+        addr_info = self.rpc_wallet('validateaddress', [address])
         return addr_info.get('ismine', False)
 
     def encodeProofUtxos(self, proof_utxos):
@@ -504,18 +567,133 @@ class DCRInterface(Secp256k1Interface):
         txn_funded = self.createRawFundedTransaction(addr_to, amount)
         return self.rpc_wallet('signrawtransaction', [txn_funded])['hex']
 
-    def getLockTxHeight(self, txid, dest_address, bid_amount, rescan_from, find_index: bool = False):
+    def getLockTxHeight(self, txid, dest_address, bid_amount, rescan_from, find_index: bool = False, vout: int = -1):
-        self._log.debug('TODO: getLockTxHeight')
+        if txid is None:
-        return None
+            self._log.debug('TODO: getLockTxHeight')
+            return None
+
+        found_vout = None
+        # Search for txo at vout 0 and 1 if vout is not known
+        if vout is None:
+            test_range = range(2)
+        else:
+            test_range = (vout, )
+        for try_vout in test_range:
+            try:
+                txout = self.rpc('gettxout', [txid.hex(), try_vout, 0, True])
+                addresses = txout['scriptPubKey']['addresses']
+                if len(addresses) != 1 or addresses[0] != dest_address:
+                    continue
+                if self.make_int(txout['value']) != bid_amount:
+                    self._log.warning('getLockTxHeight found txout {} with incorrect amount {}'.format(txid.hex(), txout['value']))
+                    continue
+                found_vout = try_vout
+                break
+            except Exception as e:
+                # self._log.warning('gettxout {}'.format(e))
+                return None
+
+        block_height: int = 0
+        confirmations: int = 0 if 'confirmations' not in txout else txout['confirmations']
+
+        # TODO: Better way?
+        if confirmations > 0:
+            block_height = self.getChainHeight() - confirmations
+
+        rv = {
+            'depth': confirmations,
+            'index': found_vout,
+            'height': block_height}
+
+        return rv
 
     def find_prevout_info(self, txn_hex: str, txn_script: bytes):
         txjs = self.rpc('decoderawtransaction', [txn_hex])
         n = getVoutByScriptPubKey(txjs, self.getScriptDest(txn_script).hex())
 
+        txo = txjs['vout'][n]
         return {
             'txid': txjs['txid'],
             'vout': n,
-            'scriptPubKey': txjs['vout'][n]['scriptPubKey']['hex'],
+            'scriptPubKey': txo['scriptPubKey']['hex'],
             'redeemScript': txn_script.hex(),
-            'amount': txjs['vout'][n]['value']
+            'amount': txo['value'],
         }
+
+    def getHTLCSpendTxVSize(self, redeem: bool = True) -> int:
+        tx_vsize = 5  # Add a few bytes, sequence in script takes variable amount of bytes
+        tx_vsize += 348 if redeem else 316
+        return tx_vsize
+
+    def createRedeemTxn(self, prevout, output_addr: str, output_value: int, txn_script: bytes = None) -> str:
+        tx = CTransaction()
+        tx.version = self.txVersion()
+        prev_txid = uint256_from_str(bytes.fromhex(prevout['txid'])[::-1])
+        tx.vin.append(CTxIn(COutPoint(prev_txid, prevout['vout'], 0)))
+        pkh = self.decode_address(output_addr)[2:]
+        script = self.getPubkeyHashDest(pkh)
+        tx.vout.append(self.txoType()(output_value, script))
+        return tx.serialize().hex()
+
+    def createRefundTxn(self, prevout, output_addr: str, output_value: int, locktime: int, sequence: int, txn_script: bytes = None) -> str:
+        tx = CTransaction()
+        tx.version = self.txVersion()
+        tx.locktime = locktime
+        prev_txid = uint256_from_str(bytes.fromhex(prevout['txid'])[::-1])
+        tx.vin.append(CTxIn(COutPoint(prev_txid, prevout['vout'], 0), sequence=sequence,))
+        pkh = self.decode_address(output_addr)[2:]
+        script = self.getPubkeyHashDest(pkh)
+        tx.vout.append(self.txoType()(output_value, script))
+        return tx.serialize().hex()
+
+    def verifyRawTransaction(self, tx_hex: str, prevouts):
+        inputs_valid: bool = True
+        validscripts: int = 0
+
+        tx_bytes = bytes.fromhex(tx_hex)
+        tx = self.loadTx(bytes.fromhex(tx_hex))
+
+        for i, txi in enumerate(tx.vin):
+            prevout_data = prevouts[i]
+            redeem_script = bytes.fromhex(prevout_data['redeemScript'])
+            prevout_value = self.make_int(prevout_data['amount'])
+            sig, pk = extract_sig_and_pk(txi.signature_script)
+
+            if not sig or not pk:
+                self._log.warning(f'verifyRawTransaction failed to extract signature for input {i}')
+                continue
+
+            if self.verifyTxSig(tx_bytes, sig, pk, i, redeem_script, prevout_value):
+                validscripts += 1
+
+        # TODO: validate inputs
+        inputs_valid = True
+
+        return {
+            'inputs_valid': inputs_valid,
+            'validscripts': validscripts,
+        }
+
+    def getBlockHeaderFromHeight(self, height):
+        block_hash = self.rpc('getblockhash', [height])
+        return self.rpc('getblockheader', [block_hash])
+
+    def getBlockWithTxns(self, block_hash: str):
+        block = self.rpc('getblock', [block_hash, True, True])
+
+        return {
+            'hash': block['hash'],
+            'previousblockhash': block['previousblockhash'],
+            'tx': block['rawtx'],
+            'confirmations': block['confirmations'],
+            'height': block['height'],
+            'time': block['time'],
+            'version': block['version'],
+            'merkleroot': block['merkleroot'],
+        }
+
+    def publishTx(self, tx: bytes):
+        return self.rpc('sendrawtransaction', [tx.hex()])
+
+    def describeTx(self, tx_hex: str):
+        return self.rpc('decoderawtransaction', [tx_hex])

basicswap/interface/dcr/messages.py

@@ -8,7 +8,7 @@
 import copy
 from enum import IntEnum
 from basicswap.util.crypto import blake256
-from basicswap.util.integer import decode_varint, encode_varint
+from basicswap.util.integer import decode_compactsize, encode_compactsize
 
 
 class TxSerializeType(IntEnum):
@@ -86,12 +86,12 @@ class CTransaction:
     def deserialize(self, data: bytes) -> None:
 
         version = int.from_bytes(data[:4], 'little')
-        self.version = self.version & 0xffff
+        self.version = version & 0xffff
         ser_type: int = version >> 16
         o = 4
 
         if ser_type == TxSerializeType.Full or ser_type == TxSerializeType.NoWitness:
-            num_txin, nb = decode_varint(data, o)
+            num_txin, nb = decode_compactsize(data, o)
             o += nb
 
             for i in range(num_txin):
@@ -107,7 +107,7 @@ class CTransaction:
                 o += 4
                 self.vin.append(txi)
 
-            num_txout, nb = decode_varint(data, o)
+            num_txout, nb = decode_compactsize(data, o)
             o += nb
 
             for i in range(num_txout):
@@ -116,7 +116,7 @@ class CTransaction:
                 o += 8
                 txo.version = int.from_bytes(data[o:o + 2], 'little')
                 o += 2
-                script_bytes, nb = decode_varint(data, o)
+                script_bytes, nb = decode_compactsize(data, o)
                 o += nb
                 txo.script_pubkey = data[o:o + script_bytes]
                 o += script_bytes
@@ -130,7 +130,7 @@ class CTransaction:
         if ser_type == TxSerializeType.NoWitness:
             return
 
-        num_wit_scripts, nb = decode_varint(data, o)
+        num_wit_scripts, nb = decode_compactsize(data, o)
         o += nb
 
         if ser_type == TxSerializeType.OnlyWitness:
@@ -147,7 +147,7 @@ class CTransaction:
             o += 4
             txi.block_index = int.from_bytes(data[o:o + 4], 'little')
             o += 4
-            script_bytes, nb = decode_varint(data, o)
+            script_bytes, nb = decode_compactsize(data, o)
             o += nb
             txi.signature_script = data[o:o + script_bytes]
             o += script_bytes
@@ -158,31 +158,31 @@ class CTransaction:
         data += version.to_bytes(4, 'little')
 
         if ser_type == TxSerializeType.Full or ser_type == TxSerializeType.NoWitness:
-            data += encode_varint(len(self.vin))
+            data += encode_compactsize(len(self.vin))
             for txi in self.vin:
                 data += txi.prevout.hash.to_bytes(32, 'little')
                 data += txi.prevout.n.to_bytes(4, 'little')
                 data += txi.prevout.tree.to_bytes(1)
                 data += txi.sequence.to_bytes(4, 'little')
 
-            data += encode_varint(len(self.vout))
+            data += encode_compactsize(len(self.vout))
             for txo in self.vout:
                 data += txo.value.to_bytes(8, 'little')
                 data += txo.version.to_bytes(2, 'little')
-                data += encode_varint(len(txo.script_pubkey))
+                data += encode_compactsize(len(txo.script_pubkey))
                 data += txo.script_pubkey
 
             data += self.locktime.to_bytes(4, 'little')
             data += self.expiry.to_bytes(4, 'little')
 
         if ser_type == TxSerializeType.Full or ser_type == TxSerializeType.OnlyWitness:
-            data += encode_varint(len(self.vin))
+            data += encode_compactsize(len(self.vin))
             for txi in self.vin:
                 tc_value_in = txi.value_in & 0xffffffffffffffff  # Convert negative values
                 data += tc_value_in.to_bytes(8, 'little')
                 data += txi.block_height.to_bytes(4, 'little')
                 data += txi.block_index.to_bytes(4, 'little')
-                data += encode_varint(len(txi.signature_script))
+                data += encode_compactsize(len(txi.signature_script))
                 data += txi.signature_script
 
         return data

basicswap/interface/firo.py

@@ -87,7 +87,7 @@ class FIROInterface(BTCInterface):
 
         return address
 
-    def getLockTxHeight(self, txid, dest_address, bid_amount, rescan_from, find_index: bool = False):
+    def getLockTxHeight(self, txid, dest_address, bid_amount, rescan_from, find_index: bool = False, vout: int = -1):
         # Add watchonly address and rescan if required
 
         if not self.isAddressMine(dest_address, or_watch_only=True):
@@ -337,7 +337,7 @@ class FIROInterface(BTCInterface):
                         return
             current_height -= 1
 
-    def getBlockWithTxns(self, block_hash):
+    def getBlockWithTxns(self, block_hash: str):
         # TODO: Bypass decoderawtransaction and getblockheader
         block = self.rpc('getblock', [block_hash, False])
         block_header = self.rpc('getblockheader', [block_hash])
@@ -355,9 +355,11 @@ class FIROInterface(BTCInterface):
 
         block_rv = {
             'hash': block_hash,
+            'previousblockhash': block_header['previousblockhash'],
             'tx': tx_rv,
             'confirmations': block_header['confirmations'],
             'height': block_header['height'],
+            'time': block_header['time'],
             'version': block_header['version'],
             'merkleroot': block_header['merkleroot'],
         }

basicswap/interface/nav.py

@@ -415,7 +415,7 @@ class NAVInterface(BTCInterface):
                         return
             current_height -= 1
 
-    def getLockTxHeight(self, txid, dest_address, bid_amount, rescan_from, find_index: bool = False):
+    def getLockTxHeight(self, txid, dest_address, bid_amount, rescan_from, find_index: bool = False, vout: int = -1):
         # Add watchonly address and rescan if required
 
         if not self.isAddressMine(dest_address, or_watch_only=True):
@@ -479,9 +479,11 @@ class NAVInterface(BTCInterface):
 
         block_rv = {
             'hash': block_hash,
+            'previousblockhash': block_header['previousblockhash'],
             'tx': tx_rv,
             'confirmations': block_header['confirmations'],
             'height': block_header['height'],
+            'time': block_header['time'],
             'version': block_header['version'],
             'merkleroot': block_header['merkleroot'],
         }

basicswap/interface/nmc.py

@@ -14,7 +14,7 @@ class NMCInterface(BTCInterface):
     def coin_type():
         return Coins.NMC
 
-    def getLockTxHeight(self, txid, dest_address, bid_amount, rescan_from, find_index=False):
+    def getLockTxHeight(self, txid, dest_address, bid_amount, rescan_from, find_index: bool = False, vout: int = -1):
         self._log.debug('[rm] scantxoutset start')  # scantxoutset is slow
         ro = self.rpc('scantxoutset', ['start', ['addr({})'.format(dest_address)]])  # TODO: Use combo(address) where possible
         self._log.debug('[rm] scantxoutset end')

basicswap/interface/part.py

@@ -14,7 +14,7 @@ from basicswap.contrib.test_framework.messages import (
 from basicswap.contrib.test_framework.script import (
     CScript,
     OP_0,
-    OP_DUP, OP_HASH160, OP_EQUALVERIFY, OP_CHECKSIG
+    OP_DUP, OP_HASH160, OP_EQUALVERIFY, OP_CHECKSIG,
 )
 from basicswap.util import (
     ensure,
@@ -26,8 +26,8 @@ from basicswap.util.script import (
     getWitnessElementLen,
 )
 from basicswap.util.address import (
-    toWIF,
+    encodeStealthAddress,
-    encodeStealthAddress)
+)
 from basicswap.chainparams import Coins, chainparams
 from .btc import BTCInterface
 
@@ -73,6 +73,9 @@ class PARTInterface(BTCInterface):
         super().__init__(coin_settings, network, swap_client)
         self.setAnonTxRingSize(int(coin_settings.get('anon_tx_ring_size', 12)))
 
+    def use_tx_vsize(self) -> bool:
+        return True
+
     def setAnonTxRingSize(self, value):
         ensure(value >= 3 and value < 33, 'Invalid anon_tx_ring_size value')
         self._anon_tx_ring_size = value
@@ -687,8 +690,7 @@ class PARTInterfaceBlind(PARTInterface):
         else:
             addr_info = self.rpc_wallet('getaddressinfo', [sx_addr])
             if not addr_info['iswatchonly']:
-                wif_prefix = self.chainparams_network()['key_prefix']
+                wif_scan_key = self.encodeKey(kbv)
-                wif_scan_key = toWIF(wif_prefix, kbv)
                 self.rpc_wallet('importstealthaddress', [wif_scan_key, Kbs.hex()])
                 self._log.info('Imported watch-only sx_addr: {}'.format(sx_addr))
                 self._log.info('Rescanning {} chain from height: {}'.format(self.coin_name(), restore_height))
@@ -719,9 +721,8 @@ class PARTInterfaceBlind(PARTInterface):
         sx_addr = self.formatStealthAddress(Kbv, Kbs)
         addr_info = self.rpc_wallet('getaddressinfo', [sx_addr])
         if not addr_info['ismine']:
-            wif_prefix = self.chainparams_network()['key_prefix']
+            wif_scan_key = self.encodeKey(kbv)
-            wif_scan_key = toWIF(wif_prefix, kbv)
+            wif_spend_key = self.encodeKey(kbs)
-            wif_spend_key = toWIF(wif_prefix, kbs)
             self.rpc_wallet('importstealthaddress', [wif_scan_key, wif_spend_key])
             self._log.info('Imported spend key for sx_addr: {}'.format(sx_addr))
             self._log.info('Rescanning {} chain from height: {}'.format(self.coin_name(), restore_height))
@@ -825,8 +826,7 @@ class PARTInterfaceAnon(PARTInterface):
         else:
             addr_info = self.rpc_wallet('getaddressinfo', [sx_addr])
             if not addr_info['iswatchonly']:
-                wif_prefix = self.chainparams_network()['key_prefix']
+                wif_scan_key = self.encodeKey(kbv)
-                wif_scan_key = toWIF(wif_prefix, kbv)
                 self.rpc_wallet('importstealthaddress', [wif_scan_key, Kbs.hex()])
                 self._log.info('Imported watch-only sx_addr: {}'.format(sx_addr))
                 self._log.info('Rescanning {} chain from height: {}'.format(self.coin_name(), restore_height))
@@ -857,9 +857,8 @@ class PARTInterfaceAnon(PARTInterface):
         sx_addr = self.formatStealthAddress(Kbv, Kbs)
         addr_info = self.rpc_wallet('getaddressinfo', [sx_addr])
         if not addr_info['ismine']:
-            wif_prefix = self.chainparams_network()['key_prefix']
+            wif_scan_key = self.encodeKey(kbv)
-            wif_scan_key = toWIF(wif_prefix, kbv)
+            wif_spend_key = self.encodeKey(kbs)
-            wif_spend_key = toWIF(wif_prefix, kbs)
             self.rpc_wallet('importstealthaddress', [wif_scan_key, wif_spend_key])
             self._log.info('Imported spend key for sx_addr: {}'.format(sx_addr))
             self._log.info('Rescanning {} chain from height: {}'.format(self.coin_name(), restore_height))

basicswap/interface/pivx.py

@@ -75,9 +75,11 @@ class PIVXInterface(BTCInterface):
 
         block_rv = {
             'hash': block_hash,
+            'previousblockhash': block_header['previousblockhash'],
             'tx': tx_rv,
             'confirmations': block_header['confirmations'],
             'height': block_header['height'],
+            'time': block_header['time'],
             'version': block_header['version'],
             'merkleroot': block_header['merkleroot'],
         }

basicswap/messages.proto

@@ -49,6 +49,9 @@ message BidMessage {
     string proof_signature = 8;
 
     bytes proof_utxos = 9;          /* 32 byte txid 2 byte vout, repeated */
+
+    /* optional */
+    bytes pkhash_buyer_to = 13;     /* When pubkey hash is different on the to-chain */
 }
 
 /* For tests */
@@ -65,6 +68,7 @@ message BidAcceptMessage {
     bytes bid_msg_id = 1;
     bytes initiate_txid = 2;
     bytes contract_script = 3;
+    bytes pkhash_seller = 4;
 }
 
 message OfferRevokeMessage {

basicswap/messages_pb2.py

@@ -14,7 +14,7 @@ _sym_db = _symbol_database.Default()
 
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x0emessages.proto\x12\tbasicswap\"\xc0\x04\n\x0cOfferMessage\x12\x18\n\x10protocol_version\x18\x01 \x01(\r\x12\x11\n\tcoin_from\x18\x02 \x01(\r\x12\x0f\n\x07\x63oin_to\x18\x03 \x01(\r\x12\x13\n\x0b\x61mount_from\x18\x04 \x01(\x04\x12\x11\n\tamount_to\x18\x05 \x01(\x04\x12\x16\n\x0emin_bid_amount\x18\x06 \x01(\x04\x12\x12\n\ntime_valid\x18\x07 \x01(\x04\x12\x33\n\tlock_type\x18\x08 \x01(\x0e\x32 .basicswap.OfferMessage.LockType\x12\x12\n\nlock_value\x18\t \x01(\r\x12\x11\n\tswap_type\x18\n \x01(\r\x12\x15\n\rproof_address\x18\x0b \x01(\t\x12\x17\n\x0fproof_signature\x18\x0c \x01(\t\x12\x15\n\rpkhash_seller\x18\r \x01(\x0c\x12\x13\n\x0bsecret_hash\x18\x0e \x01(\x0c\x12\x15\n\rfee_rate_from\x18\x0f \x01(\x04\x12\x13\n\x0b\x66\x65\x65_rate_to\x18\x10 \x01(\x04\x12\x19\n\x11\x61mount_negotiable\x18\x11 \x01(\x08\x12\x17\n\x0frate_negotiable\x18\x12 \x01(\x08\x12\x13\n\x0bproof_utxos\x18\x13 \x01(\x0c\"q\n\x08LockType\x12\x0b\n\x07NOT_SET\x10\x00\x12\x18\n\x14SEQUENCE_LOCK_BLOCKS\x10\x01\x12\x16\n\x12SEQUENCE_LOCK_TIME\x10\x02\x12\x13\n\x0f\x41\x42S_LOCK_BLOCKS\x10\x03\x12\x11\n\rABS_LOCK_TIME\x10\x04\"\xce\x01\n\nBidMessage\x12\x18\n\x10protocol_version\x18\x01 \x01(\r\x12\x14\n\x0coffer_msg_id\x18\x02 \x01(\x0c\x12\x12\n\ntime_valid\x18\x03 \x01(\x04\x12\x0e\n\x06\x61mount\x18\x04 \x01(\x04\x12\x11\n\tamount_to\x18\x05 \x01(\x04\x12\x14\n\x0cpkhash_buyer\x18\x06 \x01(\x0c\x12\x15\n\rproof_address\x18\x07 \x01(\t\x12\x17\n\x0fproof_signature\x18\x08 \x01(\t\x12\x13\n\x0bproof_utxos\x18\t \x01(\x0c\"s\n\x0f\x42idMessage_test\x12\x18\n\x10protocol_version\x18\x01 \x01(\r\x12\x14\n\x0coffer_msg_id\x18\x02 \x01(\x0c\x12\x12\n\ntime_valid\x18\x03 \x01(\x04\x12\x0e\n\x06\x61mount\x18\x04 \x01(\x04\x12\x0c\n\x04rate\x18\x05 \x01(\x04\"V\n\x10\x42idAcceptMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x15\n\rinitiate_txid\x18\x02 \x01(\x0c\x12\x17\n\x0f\x63ontract_script\x18\x03 \x01(\x0c\"=\n\x12OfferRevokeMessage\x12\x14\n\x0coffer_msg_id\x18\x01 \x01(\x0c\x12\x11\n\tsignature\x18\x02 \x01(\x0c\";\n\x10\x42idRejectMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x13\n\x0breject_code\x18\x02 \x01(\r\"\xb7\x01\n\rXmrBidMessage\x12\x18\n\x10protocol_version\x18\x01 \x01(\r\x12\x14\n\x0coffer_msg_id\x18\x02 \x01(\x0c\x12\x12\n\ntime_valid\x18\x03 \x01(\x04\x12\x0e\n\x06\x61mount\x18\x04 \x01(\x04\x12\x11\n\tamount_to\x18\x05 \x01(\x04\x12\x0c\n\x04pkaf\x18\x06 \x01(\x0c\x12\x0c\n\x04kbvf\x18\x07 \x01(\x0c\x12\x12\n\nkbsf_dleag\x18\x08 \x01(\x0c\x12\x0f\n\x07\x64\x65st_af\x18\t \x01(\x0c\"T\n\x0fXmrSplitMessage\x12\x0e\n\x06msg_id\x18\x01 \x01(\x0c\x12\x10\n\x08msg_type\x18\x02 \x01(\r\x12\x10\n\x08sequence\x18\x03 \x01(\r\x12\r\n\x05\x64leag\x18\x04 \x01(\x0c\"\x80\x02\n\x13XmrBidAcceptMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x0c\n\x04pkal\x18\x02 \x01(\x0c\x12\x0c\n\x04kbvl\x18\x03 \x01(\x0c\x12\x12\n\nkbsl_dleag\x18\x04 \x01(\x0c\x12\x11\n\ta_lock_tx\x18\x05 \x01(\x0c\x12\x18\n\x10\x61_lock_tx_script\x18\x06 \x01(\x0c\x12\x18\n\x10\x61_lock_refund_tx\x18\x07 \x01(\x0c\x12\x1f\n\x17\x61_lock_refund_tx_script\x18\x08 \x01(\x0c\x12\x1e\n\x16\x61_lock_refund_spend_tx\x18\t \x01(\x0c\x12\x1d\n\x15\x61l_lock_refund_tx_sig\x18\n \x01(\x0c\"r\n\x17XmrBidLockTxSigsMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12$\n\x1c\x61\x66_lock_refund_spend_tx_esig\x18\x02 \x01(\x0c\x12\x1d\n\x15\x61\x66_lock_refund_tx_sig\x18\x03 \x01(\x0c\"X\n\x18XmrBidLockSpendTxMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x17\n\x0f\x61_lock_spend_tx\x18\x02 \x01(\x0c\x12\x0f\n\x07kal_sig\x18\x03 \x01(\x0c\"M\n\x18XmrBidLockReleaseMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x1d\n\x15\x61l_lock_spend_tx_esig\x18\x02 \x01(\x0c\"\x81\x01\n\x13\x41\x44SBidIntentMessage\x12\x18\n\x10protocol_version\x18\x01 \x01(\r\x12\x14\n\x0coffer_msg_id\x18\x02 \x01(\x0c\x12\x12\n\ntime_valid\x18\x03 \x01(\x04\x12\x13\n\x0b\x61mount_from\x18\x04 \x01(\x04\x12\x11\n\tamount_to\x18\x05 \x01(\x04\"p\n\x19\x41\x44SBidIntentAcceptMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x0c\n\x04pkaf\x18\x02 \x01(\x0c\x12\x0c\n\x04kbvf\x18\x03 \x01(\x0c\x12\x12\n\nkbsf_dleag\x18\x04 \x01(\x0c\x12\x0f\n\x07\x64\x65st_af\x18\x05 \x01(\x0c\x62\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x0emessages.proto\x12\tbasicswap\"\xc0\x04\n\x0cOfferMessage\x12\x18\n\x10protocol_version\x18\x01 \x01(\r\x12\x11\n\tcoin_from\x18\x02 \x01(\r\x12\x0f\n\x07\x63oin_to\x18\x03 \x01(\r\x12\x13\n\x0b\x61mount_from\x18\x04 \x01(\x04\x12\x11\n\tamount_to\x18\x05 \x01(\x04\x12\x16\n\x0emin_bid_amount\x18\x06 \x01(\x04\x12\x12\n\ntime_valid\x18\x07 \x01(\x04\x12\x33\n\tlock_type\x18\x08 \x01(\x0e\x32 .basicswap.OfferMessage.LockType\x12\x12\n\nlock_value\x18\t \x01(\r\x12\x11\n\tswap_type\x18\n \x01(\r\x12\x15\n\rproof_address\x18\x0b \x01(\t\x12\x17\n\x0fproof_signature\x18\x0c \x01(\t\x12\x15\n\rpkhash_seller\x18\r \x01(\x0c\x12\x13\n\x0bsecret_hash\x18\x0e \x01(\x0c\x12\x15\n\rfee_rate_from\x18\x0f \x01(\x04\x12\x13\n\x0b\x66\x65\x65_rate_to\x18\x10 \x01(\x04\x12\x19\n\x11\x61mount_negotiable\x18\x11 \x01(\x08\x12\x17\n\x0frate_negotiable\x18\x12 \x01(\x08\x12\x13\n\x0bproof_utxos\x18\x13 \x01(\x0c\"q\n\x08LockType\x12\x0b\n\x07NOT_SET\x10\x00\x12\x18\n\x14SEQUENCE_LOCK_BLOCKS\x10\x01\x12\x16\n\x12SEQUENCE_LOCK_TIME\x10\x02\x12\x13\n\x0f\x41\x42S_LOCK_BLOCKS\x10\x03\x12\x11\n\rABS_LOCK_TIME\x10\x04\"\xe7\x01\n\nBidMessage\x12\x18\n\x10protocol_version\x18\x01 \x01(\r\x12\x14\n\x0coffer_msg_id\x18\x02 \x01(\x0c\x12\x12\n\ntime_valid\x18\x03 \x01(\x04\x12\x0e\n\x06\x61mount\x18\x04 \x01(\x04\x12\x11\n\tamount_to\x18\x05 \x01(\x04\x12\x14\n\x0cpkhash_buyer\x18\x06 \x01(\x0c\x12\x15\n\rproof_address\x18\x07 \x01(\t\x12\x17\n\x0fproof_signature\x18\x08 \x01(\t\x12\x13\n\x0bproof_utxos\x18\t \x01(\x0c\x12\x17\n\x0fpkhash_buyer_to\x18\r \x01(\x0c\"s\n\x0f\x42idMessage_test\x12\x18\n\x10protocol_version\x18\x01 \x01(\r\x12\x14\n\x0coffer_msg_id\x18\x02 \x01(\x0c\x12\x12\n\ntime_valid\x18\x03 \x01(\x04\x12\x0e\n\x06\x61mount\x18\x04 \x01(\x04\x12\x0c\n\x04rate\x18\x05 \x01(\x04\"m\n\x10\x42idAcceptMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x15\n\rinitiate_txid\x18\x02 \x01(\x0c\x12\x17\n\x0f\x63ontract_script\x18\x03 \x01(\x0c\x12\x15\n\rpkhash_seller\x18\x04 \x01(\x0c\"=\n\x12OfferRevokeMessage\x12\x14\n\x0coffer_msg_id\x18\x01 \x01(\x0c\x12\x11\n\tsignature\x18\x02 \x01(\x0c\";\n\x10\x42idRejectMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x13\n\x0breject_code\x18\x02 \x01(\r\"\xb7\x01\n\rXmrBidMessage\x12\x18\n\x10protocol_version\x18\x01 \x01(\r\x12\x14\n\x0coffer_msg_id\x18\x02 \x01(\x0c\x12\x12\n\ntime_valid\x18\x03 \x01(\x04\x12\x0e\n\x06\x61mount\x18\x04 \x01(\x04\x12\x11\n\tamount_to\x18\x05 \x01(\x04\x12\x0c\n\x04pkaf\x18\x06 \x01(\x0c\x12\x0c\n\x04kbvf\x18\x07 \x01(\x0c\x12\x12\n\nkbsf_dleag\x18\x08 \x01(\x0c\x12\x0f\n\x07\x64\x65st_af\x18\t \x01(\x0c\"T\n\x0fXmrSplitMessage\x12\x0e\n\x06msg_id\x18\x01 \x01(\x0c\x12\x10\n\x08msg_type\x18\x02 \x01(\r\x12\x10\n\x08sequence\x18\x03 \x01(\r\x12\r\n\x05\x64leag\x18\x04 \x01(\x0c\"\x80\x02\n\x13XmrBidAcceptMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x0c\n\x04pkal\x18\x02 \x01(\x0c\x12\x0c\n\x04kbvl\x18\x03 \x01(\x0c\x12\x12\n\nkbsl_dleag\x18\x04 \x01(\x0c\x12\x11\n\ta_lock_tx\x18\x05 \x01(\x0c\x12\x18\n\x10\x61_lock_tx_script\x18\x06 \x01(\x0c\x12\x18\n\x10\x61_lock_refund_tx\x18\x07 \x01(\x0c\x12\x1f\n\x17\x61_lock_refund_tx_script\x18\x08 \x01(\x0c\x12\x1e\n\x16\x61_lock_refund_spend_tx\x18\t \x01(\x0c\x12\x1d\n\x15\x61l_lock_refund_tx_sig\x18\n \x01(\x0c\"r\n\x17XmrBidLockTxSigsMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12$\n\x1c\x61\x66_lock_refund_spend_tx_esig\x18\x02 \x01(\x0c\x12\x1d\n\x15\x61\x66_lock_refund_tx_sig\x18\x03 \x01(\x0c\"X\n\x18XmrBidLockSpendTxMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x17\n\x0f\x61_lock_spend_tx\x18\x02 \x01(\x0c\x12\x0f\n\x07kal_sig\x18\x03 \x01(\x0c\"M\n\x18XmrBidLockReleaseMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x1d\n\x15\x61l_lock_spend_tx_esig\x18\x02 \x01(\x0c\"\x81\x01\n\x13\x41\x44SBidIntentMessage\x12\x18\n\x10protocol_version\x18\x01 \x01(\r\x12\x14\n\x0coffer_msg_id\x18\x02 \x01(\x0c\x12\x12\n\ntime_valid\x18\x03 \x01(\x04\x12\x13\n\x0b\x61mount_from\x18\x04 \x01(\x04\x12\x11\n\tamount_to\x18\x05 \x01(\x04\"p\n\x19\x41\x44SBidIntentAcceptMessage\x12\x12\n\nbid_msg_id\x18\x01 \x01(\x0c\x12\x0c\n\x04pkaf\x18\x02 \x01(\x0c\x12\x0c\n\x04kbvf\x18\x03 \x01(\x0c\x12\x12\n\nkbsf_dleag\x18\x04 \x01(\x0c\x12\x0f\n\x07\x64\x65st_af\x18\x05 \x01(\x0c\x62\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -26,29 +26,29 @@ if _descriptor._USE_C_DESCRIPTORS == False:
   _globals['_OFFERMESSAGE_LOCKTYPE']._serialized_start=493
   _globals['_OFFERMESSAGE_LOCKTYPE']._serialized_end=606
   _globals['_BIDMESSAGE']._serialized_start=609
-  _globals['_BIDMESSAGE']._serialized_end=815
+  _globals['_BIDMESSAGE']._serialized_end=840
-  _globals['_BIDMESSAGE_TEST']._serialized_start=817
+  _globals['_BIDMESSAGE_TEST']._serialized_start=842
-  _globals['_BIDMESSAGE_TEST']._serialized_end=932
+  _globals['_BIDMESSAGE_TEST']._serialized_end=957
-  _globals['_BIDACCEPTMESSAGE']._serialized_start=934
+  _globals['_BIDACCEPTMESSAGE']._serialized_start=959
-  _globals['_BIDACCEPTMESSAGE']._serialized_end=1020
+  _globals['_BIDACCEPTMESSAGE']._serialized_end=1068
-  _globals['_OFFERREVOKEMESSAGE']._serialized_start=1022
+  _globals['_OFFERREVOKEMESSAGE']._serialized_start=1070
-  _globals['_OFFERREVOKEMESSAGE']._serialized_end=1083
+  _globals['_OFFERREVOKEMESSAGE']._serialized_end=1131
-  _globals['_BIDREJECTMESSAGE']._serialized_start=1085
+  _globals['_BIDREJECTMESSAGE']._serialized_start=1133
-  _globals['_BIDREJECTMESSAGE']._serialized_end=1144
+  _globals['_BIDREJECTMESSAGE']._serialized_end=1192
-  _globals['_XMRBIDMESSAGE']._serialized_start=1147
+  _globals['_XMRBIDMESSAGE']._serialized_start=1195
-  _globals['_XMRBIDMESSAGE']._serialized_end=1330
+  _globals['_XMRBIDMESSAGE']._serialized_end=1378
-  _globals['_XMRSPLITMESSAGE']._serialized_start=1332
+  _globals['_XMRSPLITMESSAGE']._serialized_start=1380
-  _globals['_XMRSPLITMESSAGE']._serialized_end=1416
+  _globals['_XMRSPLITMESSAGE']._serialized_end=1464
-  _globals['_XMRBIDACCEPTMESSAGE']._serialized_start=1419
+  _globals['_XMRBIDACCEPTMESSAGE']._serialized_start=1467
-  _globals['_XMRBIDACCEPTMESSAGE']._serialized_end=1675
+  _globals['_XMRBIDACCEPTMESSAGE']._serialized_end=1723
-  _globals['_XMRBIDLOCKTXSIGSMESSAGE']._serialized_start=1677
+  _globals['_XMRBIDLOCKTXSIGSMESSAGE']._serialized_start=1725
-  _globals['_XMRBIDLOCKTXSIGSMESSAGE']._serialized_end=1791
+  _globals['_XMRBIDLOCKTXSIGSMESSAGE']._serialized_end=1839
-  _globals['_XMRBIDLOCKSPENDTXMESSAGE']._serialized_start=1793
+  _globals['_XMRBIDLOCKSPENDTXMESSAGE']._serialized_start=1841
-  _globals['_XMRBIDLOCKSPENDTXMESSAGE']._serialized_end=1881
+  _globals['_XMRBIDLOCKSPENDTXMESSAGE']._serialized_end=1929
-  _globals['_XMRBIDLOCKRELEASEMESSAGE']._serialized_start=1883
+  _globals['_XMRBIDLOCKRELEASEMESSAGE']._serialized_start=1931
-  _globals['_XMRBIDLOCKRELEASEMESSAGE']._serialized_end=1960
+  _globals['_XMRBIDLOCKRELEASEMESSAGE']._serialized_end=2008
-  _globals['_ADSBIDINTENTMESSAGE']._serialized_start=1963
+  _globals['_ADSBIDINTENTMESSAGE']._serialized_start=2011
-  _globals['_ADSBIDINTENTMESSAGE']._serialized_end=2092
+  _globals['_ADSBIDINTENTMESSAGE']._serialized_end=2140
-  _globals['_ADSBIDINTENTACCEPTMESSAGE']._serialized_start=2094
+  _globals['_ADSBIDINTENTACCEPTMESSAGE']._serialized_start=2142
-  _globals['_ADSBIDINTENTACCEPTMESSAGE']._serialized_end=2206
+  _globals['_ADSBIDINTENTACCEPTMESSAGE']._serialized_end=2254
 # @@protoc_insertion_point(module_scope)

basicswap/protocols/atomic_swap_1.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-# Copyright (c) 2020-2023 tecnovert
+# Copyright (c) 2020-2024 tecnovert
 # Distributed under the MIT software license, see the accompanying
 # file LICENSE or http://www.opensource.org/licenses/mit-license.php.
 
@@ -10,12 +10,15 @@ from basicswap.db import (
 from basicswap.util import (
     SerialiseNum,
 )
+from basicswap.util.script import (
+    decodeScriptNum,
+)
 from basicswap.script import (
     OpCodes,
 )
 from basicswap.basicswap_util import (
-    SwapTypes,
     EventLogTypes,
+    SwapTypes,
 )
 from . import ProtocolInterface
 
@@ -23,13 +26,13 @@ INITIATE_TX_TIMEOUT = 40 * 60  # TODO: make variable per coin
 ABS_LOCK_TIME_LEEWAY = 10 * 60
 
 
-def buildContractScript(lock_val: int, secret_hash: bytes, pkh_redeem: bytes, pkh_refund: bytes, op_lock=OpCodes.OP_CHECKSEQUENCEVERIFY) -> bytearray:
+def buildContractScript(lock_val: int, secret_hash: bytes, pkh_redeem: bytes, pkh_refund: bytes, op_lock=OpCodes.OP_CHECKSEQUENCEVERIFY, op_hash=OpCodes.OP_SHA256) -> bytearray:
     script = bytearray([
         OpCodes.OP_IF,
         OpCodes.OP_SIZE,
         0x01, 0x20,  # 32
         OpCodes.OP_EQUALVERIFY,
-        OpCodes.OP_SHA256,
+        op_hash,
         0x20]) \
         + secret_hash \
         + bytearray([
@@ -54,6 +57,46 @@ def buildContractScript(lock_val: int, secret_hash: bytes, pkh_redeem: bytes, pk
     return script
 
 
+def verifyContractScript(script, op_lock=OpCodes.OP_CHECKSEQUENCEVERIFY, op_hash=OpCodes.OP_SHA256):
+    if script[0] != OpCodes.OP_IF or \
+       script[1] != OpCodes.OP_SIZE or \
+       script[2] != 0x01 or script[3] != 0x20 or \
+       script[4] != OpCodes.OP_EQUALVERIFY or \
+       script[5] != op_hash or \
+       script[6] != 0x20:
+        return False, None, None, None, None
+    o = 7
+    script_hash = script[o: o + 32]
+    o += 32
+    if script[o] != OpCodes.OP_EQUALVERIFY or \
+       script[o + 1] != OpCodes.OP_DUP or \
+       script[o + 2] != OpCodes.OP_HASH160 or \
+       script[o + 3] != 0x14:
+        return False, script_hash, None, None, None
+    o += 4
+    pkh_redeem = script[o: o + 20]
+    o += 20
+    if script[o] != OpCodes.OP_ELSE:
+        return False, script_hash, pkh_redeem, None, None
+    o += 1
+    lock_val, nb = decodeScriptNum(script, o)
+    o += nb
+    if script[o] != op_lock or \
+       script[o + 1] != OpCodes.OP_DROP or \
+       script[o + 2] != OpCodes.OP_DUP or \
+       script[o + 3] != OpCodes.OP_HASH160 or \
+       script[o + 4] != 0x14:
+        return False, script_hash, pkh_redeem, lock_val, None
+    o += 5
+    pkh_refund = script[o: o + 20]
+    o += 20
+    if script[o] != OpCodes.OP_ENDIF or \
+       script[o + 1] != OpCodes.OP_EQUALVERIFY or \
+       script[o + 2] != OpCodes.OP_CHECKSIG:
+        return False, script_hash, pkh_redeem, lock_val, pkh_refund
+    return True, script_hash, pkh_redeem, lock_val, pkh_refund
+
+
 def extractScriptSecretHash(script):
     return script[7:39]
 

basicswap/script.py

@@ -26,3 +26,5 @@ class OpCodes(IntEnum):
     OP_CHECKSIG = 0xac,
     OP_CHECKLOCKTIMEVERIFY = 0xb1,
     OP_CHECKSEQUENCEVERIFY = 0xb2,
+
+    OP_SHA256_DECRED = 0xc0,

basicswap/util/integer.py

@@ -5,6 +5,29 @@
 # file LICENSE or http://www.opensource.org/licenses/mit-license.php.
 
 
+def decode_compactsize(b: bytes, offset: int = 0) -> (int, int):
+    i = b[offset]
+    if i < 0xfd:
+        return i, 1
+    offset += 1
+    if i == 0xfd:
+        return int.from_bytes(b[offset: offset + 2]), 3
+    if i == 0xfe:
+        return int.from_bytes(b[offset: offset + 4]), 5
+    # 0xff
+    return int.from_bytes(b[offset: offset + 8]), 9
+
+
+def encode_compactsize(i: int) -> bytes:
+    if i < 0xfd:
+        return bytes((i,))
+    if i <= 0xffff:
+        return bytes((0xfd,)) + i.to_bytes(2, 'little')
+    if i <= 0xffffffff:
+        return bytes((0xfe,)) + i.to_bytes(4, 'little')
+    return bytes((0xff,)) + i.to_bytes(8, 'little')
+
+
 def decode_varint(b: bytes, offset: int = 0) -> (int, int):
     i: int = 0
     num_bytes: int = 0

tests/basicswap/common.py

@@ -389,7 +389,7 @@ def extract_states_from_xu_file(file_path, prefix):
     return states
 
 
-def compare_bid_states(states, expect_states, exact_match=True):
+def compare_bid_states(states, expect_states, exact_match: bool = True) -> bool:
 
     for i in range(len(states) - 1, -1, -1):
         if states[i][1] == 'Bid Delaying':
@@ -417,3 +417,19 @@ def compare_bid_states(states, expect_states, exact_match=True):
         logging.info('Have states: {}'.format(json.dumps(states, indent=4)))
         raise e
     return True
+
+
+def compare_bid_states_unordered(states, expect_states) -> bool:
+    for i in range(len(states) - 1, -1, -1):
+        if states[i][1] == 'Bid Delaying':
+            del states[i]
+
+    try:
+        assert len(states) == len(expect_states)
+        for state in expect_states:
+            assert (any(state in s[1] for s in states))
+    except Exception as e:
+        logging.info('Expecting states: {}'.format(json.dumps(expect_states, indent=4)))
+        logging.info('Have states: {}'.format(json.dumps(states, indent=4)))
+        raise e
+    return True

tests/basicswap/extended/test_dcr.py

@@ -5,8 +5,13 @@
 # Distributed under the MIT software license, see the accompanying
 # file LICENSE or http://www.opensource.org/licenses/mit-license.php.
 
+# TODO
+#  - Occasionally DCR simnet chain stalls.
+
+import copy
 import logging
 import os
+import random
 import select
 import subprocess
 import unittest
@@ -14,7 +19,14 @@ import unittest
 import basicswap.config as cfg
 
 from basicswap.basicswap import (
+    BidStates,
     Coins,
+    DebugTypes,
+    SwapTypes,
+    TxStates,
+)
+from basicswap.basicswap_util import (
+    TxLockTypes,
 )
 from basicswap.util.crypto import (
     hash160
@@ -27,9 +39,14 @@ from basicswap.interface.dcr.messages import (
     TxSerializeType,
 )
 from tests.basicswap.common import (
+    compare_bid_states,
+    compare_bid_states_unordered,
     stopDaemons,
-    waitForRPC,
     wait_for_balance,
+    wait_for_bid,
+    wait_for_bid_tx_state,
+    wait_for_offer,
+    waitForRPC,
 )
 from tests.basicswap.util import (
     read_json_api,
@@ -63,6 +80,176 @@ def make_rpc_func(node_id, base_rpc_port):
     return rpc_func
 
 
+def test_success_path(self, coin_from: Coins, coin_to: Coins):
+    logging.info(f'---------- Test {coin_from.name} to {coin_to.name}')
+
+    node_from = 0
+    node_to = 1
+    swap_clients = self.swap_clients
+    ci_from = swap_clients[node_from].ci(coin_from)
+    ci_to = swap_clients[node_to].ci(coin_to)
+
+    self.prepare_balance(coin_to, 100.0, 1801, 1800)
+    self.prepare_balance(coin_from, 100.0, 1800, 1801)
+
+    amt_swap = ci_from.make_int(random.uniform(0.1, 5.0), r=1)
+    rate_swap = ci_to.make_int(random.uniform(0.2, 10.0), r=1)
+
+    offer_id = swap_clients[node_from].postOffer(coin_from, coin_to, amt_swap, rate_swap, amt_swap, SwapTypes.SELLER_FIRST)
+
+    wait_for_offer(test_delay_event, swap_clients[node_to], offer_id)
+
+    offer = swap_clients[node_to].getOffer(offer_id)
+    bid_id = swap_clients[node_to].postBid(offer_id, offer.amount_from)
+
+    wait_for_bid(test_delay_event, swap_clients[node_from], bid_id)
+    swap_clients[node_from].acceptBid(bid_id)
+
+    wait_for_bid(test_delay_event, swap_clients[node_from], bid_id, BidStates.SWAP_COMPLETED, wait_for=120)
+    wait_for_bid(test_delay_event, swap_clients[node_to], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=120)
+
+    # Verify lock tx spends are found in the expected wallets
+    bid, offer = swap_clients[node_from].getBidAndOffer(bid_id)
+    max_fee: int = 10000
+    itx_spend = bid.initiate_tx.spend_txid.hex()
+    node_to_ci_from = swap_clients[node_to].ci(coin_from)
+    wtx = node_to_ci_from.rpc_wallet('gettransaction', [itx_spend,])
+    assert (amt_swap - node_to_ci_from.make_int(wtx['details'][0]['amount']) < max_fee)
+
+    node_from_ci_to = swap_clients[node_from].ci(coin_to)
+    ptx_spend = bid.participate_tx.spend_txid.hex()
+    wtx = node_from_ci_to.rpc_wallet('gettransaction', [ptx_spend,])
+    assert (bid.amount_to - node_from_ci_to.make_int(wtx['details'][0]['amount']) < max_fee)
+
+    js_0 = read_json_api(1800 + node_from)
+    js_1 = read_json_api(1800 + node_to)
+    assert (js_0['num_swapping'] == 0 and js_0['num_watched_outputs'] == 0)
+    assert (js_1['num_swapping'] == 0 and js_1['num_watched_outputs'] == 0)
+
+    bid_id_hex = bid_id.hex()
+    path = f'bids/{bid_id_hex}/states'
+    offerer_states = read_json_api(1800 + node_from, path)
+    bidder_states = read_json_api(1800 + node_to, path)
+
+    expect_states = copy.deepcopy(self.states_offerer_sh[0])
+    # Will miss PTX Sent event as PTX is found by searching the chain.
+    if coin_to == Coins.DCR:
+        expect_states[5] = 'PTX In Chain'
+    assert (compare_bid_states(offerer_states, expect_states) is True)
+    assert (compare_bid_states(bidder_states, self.states_bidder_sh[0]) is True)
+
+
+def test_bad_ptx(self, coin_from: Coins, coin_to: Coins):
+    # Invalid PTX sent, swap should stall and ITx and PTx should be reclaimed by senders
+    logging.info(f'---------- Test bad ptx {coin_from.name} to {coin_to.name}')
+
+    node_from = 0
+    node_to = 1
+    swap_clients = self.swap_clients
+    ci_from = swap_clients[node_from].ci(coin_from)
+    ci_to = swap_clients[node_to].ci(coin_to)
+
+    self.prepare_balance(coin_to, 100.0, 1801, 1800)
+    self.prepare_balance(coin_from, 100.0, 1800, 1801)
+
+    amt_swap = ci_from.make_int(random.uniform(1.1, 10.0), r=1)
+    rate_swap = ci_to.make_int(random.uniform(0.1, 2.0), r=1)
+
+    offer_id = swap_clients[node_from].postOffer(coin_from, coin_to, amt_swap, rate_swap, amt_swap, SwapTypes.SELLER_FIRST,
+                                                 TxLockTypes.SEQUENCE_LOCK_BLOCKS, 10, auto_accept_bids=True)
+
+    wait_for_offer(test_delay_event, swap_clients[node_to], offer_id)
+    offer = swap_clients[node_to].getOffer(offer_id)
+    bid_id = swap_clients[node_to].postBid(offer_id, offer.amount_from)
+    swap_clients[node_to].setBidDebugInd(bid_id, DebugTypes.MAKE_INVALID_PTX)
+
+    wait_for_bid(test_delay_event, swap_clients[node_from], bid_id, BidStates.SWAP_COMPLETED, wait_for=120)
+    wait_for_bid(test_delay_event, swap_clients[node_to], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=120)
+
+    js_0_bid = read_json_api(1800 + node_from, 'bids/{}'.format(bid_id.hex()))
+    js_1_bid = read_json_api(1800 + node_to, 'bids/{}'.format(bid_id.hex()))
+    assert (js_0_bid['itx_state'] == 'Refunded')
+    assert (js_1_bid['ptx_state'] == 'Refunded')
+
+    # Verify lock tx spends are found in the expected wallets
+    bid, offer = swap_clients[node_from].getBidAndOffer(bid_id)
+    max_fee: int = 10000
+    itx_spend = bid.initiate_tx.spend_txid.hex()
+    node_from_ci_from = swap_clients[node_from].ci(coin_from)
+    wtx = node_from_ci_from.rpc_wallet('gettransaction', [itx_spend,])
+    assert (amt_swap - node_from_ci_from.make_int(wtx['details'][0]['amount']) < max_fee)
+
+    node_to_ci_to = swap_clients[node_to].ci(coin_to)
+    bid, offer = swap_clients[node_to].getBidAndOffer(bid_id)
+    ptx_spend = bid.participate_tx.spend_txid.hex()
+    wtx = node_to_ci_to.rpc_wallet('gettransaction', [ptx_spend,])
+    assert (bid.amount_to - node_to_ci_to.make_int(wtx['details'][0]['amount']) < max_fee)
+
+    bid_id_hex = bid_id.hex()
+    path = f'bids/{bid_id_hex}/states'
+    offerer_states = read_json_api(1800 + node_from, path)
+    bidder_states = read_json_api(1800 + node_to, path)
+
+    # Hard to get the timing right
+    assert (compare_bid_states_unordered(offerer_states, self.states_offerer_sh[1]) is True)
+    assert (compare_bid_states_unordered(bidder_states, self.states_bidder_sh[1]) is True)
+
+    js_0 = read_json_api(1800 + node_from)
+    js_1 = read_json_api(1800 + node_to)
+    assert (js_0['num_swapping'] == 0 and js_0['num_watched_outputs'] == 0)
+    assert (js_1['num_swapping'] == 0 and js_1['num_watched_outputs'] == 0)
+
+
+def test_itx_refund(self, coin_from: Coins, coin_to: Coins):
+    # Offerer claims PTX and refunds ITX after lock expires
+    # Bidder loses PTX value without gaining ITX value
+    logging.info(f'---------- Test itx refund {coin_from.name} to {coin_to.name}')
+
+    node_from = 0
+    node_to = 1
+    swap_clients = self.swap_clients
+    ci_from = swap_clients[node_from].ci(coin_from)
+    ci_to = swap_clients[node_to].ci(coin_to)
+
+    self.prepare_balance(coin_to, 100.0, 1801, 1800)
+    self.prepare_balance(coin_from, 100.0, 1800, 1801)
+
+    swap_value = ci_from.make_int(random.uniform(2.0, 20.0), r=1)
+    rate_swap = ci_to.make_int(0.5, r=1)
+    offer_id = swap_clients[node_from].postOffer(coin_from, coin_to, swap_value, rate_swap, swap_value, SwapTypes.SELLER_FIRST,
+                                                 TxLockTypes.SEQUENCE_LOCK_BLOCKS, 12)
+
+    wait_for_offer(test_delay_event, swap_clients[node_to], offer_id)
+    offer = swap_clients[node_to].getOffer(offer_id)
+    bid_id = swap_clients[node_to].postBid(offer_id, offer.amount_from)
+    swap_clients[node_to].setBidDebugInd(bid_id, DebugTypes.DONT_SPEND_ITX)
+
+    wait_for_bid(test_delay_event, swap_clients[node_from], bid_id)
+
+    # For testing: Block refunding the ITX until PTX has been redeemed, else ITX refund can become spendable before PTX confirms
+    swap_clients[node_from].setBidDebugInd(bid_id, DebugTypes.SKIP_LOCK_TX_REFUND)
+    swap_clients[node_from].acceptBid(bid_id)
+    wait_for_bid_tx_state(test_delay_event, swap_clients[node_from], bid_id, TxStates.TX_CONFIRMED, TxStates.TX_REDEEMED, wait_for=120)
+    swap_clients[node_from].setBidDebugInd(bid_id, DebugTypes.NONE)
+
+    wait_for_bid_tx_state(test_delay_event, swap_clients[node_from], bid_id, TxStates.TX_REFUNDED, TxStates.TX_REDEEMED, wait_for=90)
+
+    wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, wait_for=60)
+
+    # Verify lock tx spends are found in the expected wallets
+    bid, offer = swap_clients[node_from].getBidAndOffer(bid_id)
+    max_fee: int = 10000
+    itx_spend = bid.initiate_tx.spend_txid.hex()
+    node_from_ci_from = swap_clients[node_from].ci(coin_from)
+    wtx = node_from_ci_from.rpc_wallet('gettransaction', [itx_spend,])
+    assert (swap_value - node_from_ci_from.make_int(wtx['details'][0]['amount']) < max_fee)
+
+    node_from_ci_to = swap_clients[node_from].ci(coin_to)
+    ptx_spend = bid.participate_tx.spend_txid.hex()
+    wtx = node_from_ci_to.rpc_wallet('gettransaction', [ptx_spend,])
+    assert (bid.amount_to - node_from_ci_to.make_int(wtx['details'][0]['amount']) < max_fee)
+
+
 def prepareDCDDataDir(datadir, node_id, conf_file, dir_prefix, num_nodes=3):
     node_dir = os.path.join(datadir, dir_prefix + str(node_id))
     if not os.path.exists(node_dir):
@@ -326,7 +513,7 @@ class Test(BaseTest):
         swap_clients = self.swap_clients
         ci0 = swap_clients[0].ci(self.test_coin)
 
-        utxos = ci0.getNewAddress()
+        utxos = ci0.rpc_wallet('listunspent')
         addr_out = ci0.rpc_wallet('getnewaddress')
         rtx = ci0.rpc_wallet('createrawtransaction', [[], {addr_out: 2.0}])
 
@@ -530,7 +717,8 @@ class Test(BaseTest):
         assert (len(unspents) == 1)
         utxo = unspents[0]
 
-        txout = ci0.rpc('gettxout', [utxo['txid'], utxo['vout'], utxo['tree']])
+        include_mempool: bool = False
+        txout = ci0.rpc('gettxout', [utxo['txid'], utxo['vout'], utxo['tree'], include_mempool])
 
         # Lock utxo so it's not spent for tickets, while waiting for depth
         rv = ci0.rpc_wallet('lockunspent', [False, [utxo, ]])
@@ -538,7 +726,7 @@ class Test(BaseTest):
         def wait_for_depth():
             for i in range(20):
                 logging.info('Waiting for txout depth, iter {}'.format(i))
-                txout = ci0.rpc('gettxout', [utxo['txid'], utxo['vout'], utxo['tree']])
+                txout = ci0.rpc('gettxout', [utxo['txid'], utxo['vout'], utxo['tree'], True])
                 if txout['confirmations'] > 0:
                     return txout
                 test_delay_event.wait(1)
@@ -555,11 +743,11 @@ class Test(BaseTest):
         sent_txid = ci0.rpc_wallet('sendrawtransaction', [stx['hex'], ])
 
         # NOTE: UTXO is still found when spent in the mempool (tested in loop, not delay from wallet to core)
-        txout = ci0.rpc('gettxout', [utxo['txid'], utxo['vout'], utxo['tree']])
+        txout = ci0.rpc('gettxout', [utxo['txid'], utxo['vout'], utxo['tree'], include_mempool])
         assert (addr in txout['scriptPubKey']['addresses'])
 
         for i in range(20):
-            txout = ci0.rpc('gettxout', [utxo['txid'], utxo['vout'], utxo['tree']])
+            txout = ci0.rpc('gettxout', [utxo['txid'], utxo['vout'], utxo['tree'], include_mempool])
             if txout is None:
                 logging.info('txout spent, height before spent {}, height spent {}'.format(chain_height_before_send, ci0.getChainHeight()))
                 break
@@ -574,6 +762,24 @@ class Test(BaseTest):
         amount_proved = ci0.verifyProofOfFunds(funds_proof[0], funds_proof[1], funds_proof[2], 'test'.encode('utf-8'))
         assert (amount_proved >= require_amount)
 
+    def test_02_part_coin(self):
+        test_success_path(self, Coins.PART, self.test_coin)
+
+    def test_03_coin_part(self):
+        test_success_path(self, self.test_coin, Coins.PART)
+
+    def test_04_part_coin_bad_ptx(self):
+        test_bad_ptx(self, Coins.PART, self.test_coin)
+
+    def test_05_coin_part_bad_ptx(self):
+        test_bad_ptx(self, self.test_coin, Coins.PART)
+
+    def test_06_part_coin_itx_refund(self):
+        test_itx_refund(self, Coins.PART, self.test_coin)
+
+    def test_07_coin_part_itx_refund(self):
+        test_itx_refund(self, self.test_coin, Coins.PART)
+
 
 if __name__ == '__main__':
     unittest.main()

tests/basicswap/test_other.py

@@ -319,7 +319,6 @@ class Test(unittest.TestCase):
         ci_btc = BTCInterface(coin_settings, 'regtest')
 
         for i in range(10000):
-
             test_pairs = random.randint(0, 3)
             if test_pairs == 0:
                 ci_from = ci_btc
@@ -425,6 +424,9 @@ class Test(unittest.TestCase):
         msg_buf_v2.ParseFromString(serialised_msg)
         assert (msg_buf_v2.protocol_version == 2)
         assert (msg_buf_v2.time_valid == 1024)
+        assert (msg_buf_v2.amount == 0)
+        assert (msg_buf_v2.pkhash_buyer is not None)
+        assert (len(msg_buf_v2.pkhash_buyer) == 0)
 
         # Decode only the first field
         msg_buf_v2.ParseFromString(serialised_msg[:2])

tests/basicswap/test_run.py

@@ -13,17 +13,16 @@ $ pytest -v -s tests/basicswap/test_run.py::Test::test_04_ltc_btc
 
 """
 
-import os
 import random
 import logging
 import unittest
 
 from basicswap.basicswap import (
+    BidStates,
     Coins,
+    DebugTypes,
     SwapTypes,
-    BidStates,
     TxStates,
-    DebugTypes,
 )
 from basicswap.basicswap_util import (
     TxLockTypes,
@@ -40,24 +39,23 @@ from tests.basicswap.util import (
     read_json_api,
 )
 from tests.basicswap.common import (
-    wait_for_offer,
+    BTC_BASE_RPC_PORT,
-    wait_for_bid,
+    compare_bid_states,
+    LTC_BASE_RPC_PORT,
+    TEST_HTTP_PORT,
     wait_for_balance,
-    wait_for_unspent,
+    wait_for_bid,
     wait_for_bid_tx_state,
     wait_for_in_progress,
-    TEST_HTTP_PORT,
+    wait_for_offer,
-    LTC_BASE_RPC_PORT,
+    wait_for_unspent,
-    BTC_BASE_RPC_PORT,
-    compare_bid_states,
-    extract_states_from_xu_file,
 )
 from basicswap.contrib.test_framework.messages import (
-    ToHex,
-    CTxIn,
     COutPoint,
     CTransaction,
+    CTxIn,
     CTxInWitness,
+    ToHex,
 )
 from basicswap.contrib.test_framework.script import (
     CScript,
@@ -88,10 +86,6 @@ class Test(BaseTest):
         wait_for_balance(test_delay_event, 'http://127.0.0.1:1801/json/wallets/btc', 'balance', 1000.0)
         wait_for_balance(test_delay_event, 'http://127.0.0.1:1801/json/wallets/ltc', 'balance', 1000.0)
 
-        diagrams_dir = 'doc/protocols/sequence_diagrams'
-        cls.states_bidder = extract_states_from_xu_file(os.path.join(diagrams_dir, 'bidder.alt.xu'), 'B')
-        cls.states_offerer = extract_states_from_xu_file(os.path.join(diagrams_dir, 'offerer.alt.xu'), 'O')
-
         # Wait for height, or sequencelock is thrown off by genesis blocktime
         cls.waitForParticlHeight(3)
 
@@ -329,7 +323,8 @@ class Test(BaseTest):
         logging.info('---------- Test PART to LTC')
         swap_clients = self.swap_clients
 
-        offer_id = swap_clients[0].postOffer(Coins.PART, Coins.LTC, 100 * COIN, 0.1 * COIN, 100 * COIN, SwapTypes.SELLER_FIRST)
+        swap_value = 100 * COIN
+        offer_id = swap_clients[0].postOffer(Coins.PART, Coins.LTC, swap_value, 0.1 * COIN, swap_value, SwapTypes.SELLER_FIRST)
 
         wait_for_offer(test_delay_event, swap_clients[1], offer_id)
         offer = swap_clients[1].getOffer(offer_id)
@@ -341,21 +336,34 @@ class Test(BaseTest):
 
         wait_for_in_progress(test_delay_event, swap_clients[1], bid_id, sent=True)
 
-        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, wait_for=80)
-        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=80)
 
-        js_0 = read_json_api(1800)
+        # Verify lock tx spends are found in the expected wallets
-        js_1 = read_json_api(1801)
+        bid, offer = swap_clients[0].getBidAndOffer(bid_id)
-        assert (js_0['num_swapping'] == 0 and js_0['num_watched_outputs'] == 0)
+        max_fee: int = 1000
-        assert (js_1['num_swapping'] == 0 and js_1['num_watched_outputs'] == 0)
+        itx_spend = bid.initiate_tx.spend_txid.hex()
+        ci_node_1_from = swap_clients[1].ci(Coins.PART)
+        wtx = ci_node_1_from.rpc_wallet('gettransaction', [itx_spend,])
+        assert (swap_value - ci_node_1_from.make_int(wtx['details'][0]['amount']) < max_fee)
+
+        ci_node_0_to = swap_clients[0].ci(Coins.LTC)
+        ptx_spend = bid.participate_tx.spend_txid.hex()
+        wtx = ci_node_0_to.rpc_wallet('gettransaction', [ptx_spend,])
+        assert (bid.amount_to - ci_node_0_to.make_int(wtx['details'][0]['amount']) < max_fee)
 
         bid_id_hex = bid_id.hex()
         path = f'bids/{bid_id_hex}/states'
         offerer_states = read_json_api(1800, path)
         bidder_states = read_json_api(1801, path)
 
-        assert (compare_bid_states(offerer_states, self.states_offerer[0]) is True)
+        assert (compare_bid_states(offerer_states, self.states_offerer_sh[0]) is True)
-        assert (compare_bid_states(bidder_states, self.states_bidder[0]) is True)
+        assert (compare_bid_states(bidder_states, self.states_bidder_sh[0]) is True)
+
+        js_0 = read_json_api(1800)
+        js_1 = read_json_api(1801)
+        assert (js_0['num_swapping'] == 0 and js_0['num_watched_outputs'] == 0)
+        assert (js_1['num_swapping'] == 0 and js_1['num_watched_outputs'] == 0)
 
     def test_03_ltc_part(self):
         logging.info('---------- Test LTC to PART')
@@ -372,8 +380,8 @@ class Test(BaseTest):
 
         wait_for_in_progress(test_delay_event, swap_clients[0], bid_id, sent=True)
 
-        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=80)
-        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, wait_for=80)
 
         js_0 = read_json_api(1800)
         js_1 = read_json_api(1801)
@@ -395,8 +403,8 @@ class Test(BaseTest):
 
         wait_for_in_progress(test_delay_event, swap_clients[1], bid_id, sent=True)
 
-        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, wait_for=80)
-        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=80)
 
         js_0 = read_json_api(1800)
         js_1 = read_json_api(1801)
@@ -419,8 +427,8 @@ class Test(BaseTest):
         read_json_api(1801, 'bids/{}'.format(bid_id.hex()), {'abandon': True})
         swap_clients[0].acceptBid(bid_id)
 
-        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, wait_for=80)
-        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.BID_ABANDONED, sent=True, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.BID_ABANDONED, sent=True, wait_for=80)
 
         js_0_bid = read_json_api(1800, 'bids/{}'.format(bid_id.hex()))
         js_1_bid = read_json_api(1801, 'bids/{}'.format(bid_id.hex()))
@@ -437,7 +445,7 @@ class Test(BaseTest):
         offerer_states = read_json_api(1800, path)
         bidder_states = read_json_api(1801, path)
 
-        assert (compare_bid_states(offerer_states, self.states_offerer[1]) is True)
+        assert (compare_bid_states(offerer_states, self.states_offerer_sh[1]) is True)
         assert (bidder_states[-1][1] == 'Bid Abandoned')
 
     def test_06_self_bid(self):
@@ -455,8 +463,8 @@ class Test(BaseTest):
         wait_for_bid(test_delay_event, swap_clients[0], bid_id)
         swap_clients[0].acceptBid(bid_id)
 
-        wait_for_bid_tx_state(test_delay_event, swap_clients[0], bid_id, TxStates.TX_REDEEMED, TxStates.TX_REDEEMED, wait_for=60)
+        wait_for_bid_tx_state(test_delay_event, swap_clients[0], bid_id, TxStates.TX_REDEEMED, TxStates.TX_REDEEMED, wait_for=80)
-        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, wait_for=80)
 
         js_0 = read_json_api(1800)
         assert (js_0['num_swapping'] == 0 and js_0['num_watched_outputs'] == 0)
@@ -504,8 +512,8 @@ class Test(BaseTest):
         offer = swap_clients[1].getOffer(offer_id)
         bid_id = swap_clients[1].postBid(offer_id, offer.amount_from)
 
-        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, wait_for=80)
-        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=80)
 
     def test_10_bad_ptx(self):
         # Invalid PTX sent, swap should stall and ITx and PTx should be reclaimed by senders
@@ -543,8 +551,8 @@ class Test(BaseTest):
         offerer_states = read_json_api(1800, path)
         bidder_states = read_json_api(1801, path)
 
-        assert (compare_bid_states(offerer_states, self.states_offerer[1]) is True)
+        assert (compare_bid_states(offerer_states, self.states_offerer_sh[1]) is True)
-        assert (compare_bid_states(bidder_states, self.states_bidder[1]) is True)
+        assert (compare_bid_states(bidder_states, self.states_bidder_sh[1]) is True)
 
     '''
     def test_11_refund(self):
@@ -654,8 +662,8 @@ class Test(BaseTest):
         offerer_states = read_json_api(1800, path)
         bidder_states = read_json_api(1801, path)
 
-        assert (compare_bid_states(offerer_states, self.states_offerer[2]) is True)
+        assert (compare_bid_states(offerer_states, self.states_offerer_sh[2]) is True)
-        assert (compare_bid_states(bidder_states, self.states_bidder[2], exact_match=False) is True)
+        assert (compare_bid_states(bidder_states, self.states_bidder_sh[2], exact_match=False) is True)
 
     def test_14_sweep_balance(self):
         logging.info('---------- Test sweep balance offer')
@@ -718,8 +726,8 @@ class Test(BaseTest):
         wait_for_bid(test_delay_event, swap_clients[2], bid_id)
         swap_clients[2].acceptBid(bid_id)
 
-        wait_for_bid(test_delay_event, swap_clients[2], bid_id, BidStates.SWAP_COMPLETED, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[2], bid_id, BidStates.SWAP_COMPLETED, wait_for=80)
-        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=80)
 
         # Verify expected inputs were used
         bid, offer = swap_clients[2].getBidAndOffer(bid_id)
@@ -753,8 +761,8 @@ class Test(BaseTest):
 
         wait_for_in_progress(test_delay_event, swap_clients[0], bid_id, sent=True)
 
-        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[0], bid_id, BidStates.SWAP_COMPLETED, sent=True, wait_for=80)
-        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, wait_for=60)
+        wait_for_bid(test_delay_event, swap_clients[1], bid_id, BidStates.SWAP_COMPLETED, wait_for=80)
 
     def pass_99_delay(self):
         logging.info('Delay')

tests/basicswap/test_xmr.py

@@ -334,6 +334,9 @@ class BaseTest(unittest.TestCase):
         cls.states_bidder = extract_states_from_xu_file(os.path.join(diagrams_dir, 'ads.bidder.alt.xu'), 'B')
         cls.states_offerer = extract_states_from_xu_file(os.path.join(diagrams_dir, 'ads.offerer.alt.xu'), 'O')
 
+        cls.states_bidder_sh = extract_states_from_xu_file(os.path.join(diagrams_dir, 'bidder.alt.xu'), 'B')
+        cls.states_offerer_sh = extract_states_from_xu_file(os.path.join(diagrams_dir, 'offerer.alt.xu'), 'O')
+
         if os.path.isdir(TEST_DIR):
             if RESET_TEST:
                 logging.info('Removing ' + TEST_DIR)