#!/usr/bin/env python # -*- coding: utf-8 -*- # Copyright (c) 2024 tecnovert # Distributed under the MIT software license, see the accompanying # file LICENSE or http://www.opensource.org/licenses/mit-license.php. import base64 import hashlib import json import logging import random import traceback from basicswap.basicswap_util import ( getVoutByScriptPubKey, TxLockTypes ) from basicswap.chainparams import Coins from basicswap.contrib.test_framework.script import ( CScriptNum, ) from basicswap.interface.base import ( Secp256k1Interface, ) from basicswap.interface.btc import ( extractScriptLockScriptValues, extractScriptLockRefundScriptValues, ) from basicswap.util import ( ensure, b2h, b2i, i2b, i2h, ) from basicswap.util.address import ( b58decode, b58encode, ) from basicswap.util.crypto import ( blake256, hash160, ripemd160, ) from basicswap.util.script import ( SerialiseNumCompact, ) from basicswap.util.extkey import ExtKeyPair from basicswap.util.integer import encode_varint from basicswap.interface.dcr.rpc import make_rpc_func, openrpc from .messages import ( COutPoint, CTransaction, CTxIn, CTxOut, findOutput, SigHashType, TxSerializeType, ) from .script import ( OP_CHECKMULTISIG, OP_CHECKSEQUENCEVERIFY, OP_CHECKSIG, OP_DROP, OP_DUP, OP_ELSE, OP_ENDIF, OP_EQUAL, OP_EQUALVERIFY, OP_HASH160, OP_IF, push_script_data, ) from coincurve.keys import ( PrivateKey, PublicKey, ) from coincurve.ecdsaotves import ( ecdsaotves_enc_sign, ecdsaotves_enc_verify, ecdsaotves_dec_sig, ecdsaotves_rec_enc_key ) SEQUENCE_LOCKTIME_GRANULARITY = 9 # 512 seconds SEQUENCE_LOCKTIME_TYPE_FLAG = (1 << 22) SEQUENCE_LOCKTIME_MASK = 0x0000f SigHashSerializePrefix: int = 1 SigHashSerializeWitness: int = 3 def DCRSignatureHash(sign_script: bytes, hash_type: SigHashType, tx: CTransaction, idx: int) -> bytes: masked_hash_type = hash_type & SigHashType.SigHashMask if masked_hash_type != SigHashType.SigHashAll: raise ValueError('todo') # Prefix hash sign_tx_in_idx: int = idx sign_vins = tx.vin if hash_type & SigHashType.SigHashAnyOneCanPay != 0: sign_vins = [tx.vin[idx],] sign_tx_in_idx = 0 hash_buffer = bytearray() version: int = tx.version | (SigHashSerializePrefix << 16) hash_buffer += version.to_bytes(4, 'little') hash_buffer += encode_varint(len(sign_vins)) for txi_n, txi in enumerate(sign_vins): hash_buffer += txi.prevout.hash.to_bytes(32, 'little') hash_buffer += txi.prevout.n.to_bytes(4, 'little') hash_buffer += txi.prevout.tree.to_bytes(1) # In the case of SigHashNone and SigHashSingle, commit to 0 for everything that is not the input being signed instead. if (masked_hash_type == SigHashType.SigHashNone or masked_hash_type == SigHashType.SigHashSingle) and \ sign_tx_in_idx != txi_n: hash_buffer += (0).to_bytes(4, 'little') else: hash_buffer += txi.sequence.to_bytes(4, 'little') hash_buffer += encode_varint(len(tx.vout)) for txo_n, txo in enumerate(tx.vout): if masked_hash_type == SigHashType.SigHashSingle and \ idx != txo_n: hash_buffer += (-1).to_bytes(8, 'little') hash_buffer += txo.version.to_bytes(2, 'little') hash_buffer += encode_varint(0) continue hash_buffer += txo.value.to_bytes(8, 'little') hash_buffer += txo.version.to_bytes(2, 'little') hash_buffer += encode_varint(len(txo.script_pubkey)) hash_buffer += txo.script_pubkey hash_buffer += tx.locktime.to_bytes(4, 'little') hash_buffer += tx.expiry.to_bytes(4, 'little') prefix_hash = blake256(hash_buffer) # Witness hash hash_buffer.clear() version: int = tx.version | (SigHashSerializeWitness << 16) hash_buffer += version.to_bytes(4, 'little') hash_buffer += encode_varint(len(sign_vins)) for txi_n, txi in enumerate(sign_vins): if sign_tx_in_idx != txi_n: hash_buffer += encode_varint(0) continue hash_buffer += encode_varint(len(sign_script)) hash_buffer += sign_script witness_hash = blake256(hash_buffer) hash_buffer.clear() hash_buffer += hash_type.to_bytes(4, 'little') hash_buffer += prefix_hash hash_buffer += witness_hash 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 def coin_type(): return Coins.DCR @staticmethod def exp() -> int: return 8 @staticmethod def COIN() -> int: return 100000000 @staticmethod def nbk() -> int: return 32 @staticmethod def nbK() -> int: # No. of bytes requires to encode a public key return 33 @staticmethod def txVersion() -> int: return 2 @staticmethod def txoType(): return CTxOut @staticmethod def getExpectedSequence(lockType: int, lockVal: int) -> int: ensure(lockVal >= 1, 'Bad lockVal') if lockType == TxLockTypes.SEQUENCE_LOCK_BLOCKS: return lockVal if lockType == TxLockTypes.SEQUENCE_LOCK_TIME: secondsLocked = lockVal # Ensure the locked time is never less than lockVal if secondsLocked % (1 << SEQUENCE_LOCKTIME_GRANULARITY) != 0: secondsLocked += (1 << SEQUENCE_LOCKTIME_GRANULARITY) secondsLocked >>= SEQUENCE_LOCKTIME_GRANULARITY return secondsLocked | SEQUENCE_LOCKTIME_TYPE_FLAG raise ValueError('Unknown lock type') @staticmethod def watch_blocks_for_scripts() -> bool: return True @staticmethod def depth_spendable() -> int: return 0 def __init__(self, coin_settings, network, swap_client=None): super().__init__(network) self._rpc_host = coin_settings.get('rpchost', '127.0.0.1') self._rpcport = coin_settings['rpcport'] self._rpcauth = coin_settings['rpcauth'] self._sc = swap_client self._log = self._sc.log if self._sc and self._sc.log else logging self.rpc = make_rpc_func(self._rpcport, self._rpcauth, host=self._rpc_host) if 'walletrpcport' in coin_settings: self._walletrpcport = coin_settings['walletrpcport'] self.rpc_wallet = make_rpc_func(self._walletrpcport, self._rpcauth, host=self._rpc_host) else: self._walletrpcport = None self.rpc_wallet = None self.blocks_confirmed = coin_settings['blocks_confirmed'] self.setConfTarget(coin_settings['conf_target']) self._use_segwit = True # Decred is natively segwit self._connection_type = coin_settings['connection_type'] def open_rpc(self): return openrpc(self._rpcport, self._rpcauth, host=self._rpc_host) def json_request(self, rpc_conn, method, params): try: v = rpc_conn.json_request(method, params) r = json.loads(v.decode('utf-8')) except Exception as ex: traceback.print_exc() raise ValueError('RPC Server Error ' + str(ex)) if 'error' in r and r['error'] is not None: raise ValueError('RPC error ' + str(r['error'])) return r['result'] def close_rpc(self, rpc_conn): rpc_conn.close() def use_tx_vsize(self) -> bool: return False def pkh(self, pubkey: bytes) -> bytes: return ripemd160(blake256(pubkey)) def pkh_to_address(self, pkh: bytes) -> str: prefix = self.chainparams_network()['pubkey_address'] data = prefix.to_bytes(2, 'big') + pkh checksum = blake256(blake256(data)) return b58encode(data + checksum[0:4]) def sh_to_address(self, sh: bytes) -> str: assert (len(sh) == 20) prefix = self.chainparams_network()['script_address'] data = prefix.to_bytes(2, 'big') + sh checksum = blake256(blake256(data)) return b58encode(data + checksum[0:4]) def decode_address(self, address: str) -> bytes: # Different from decodeAddress returns more prefix bytes addr_data = b58decode(address) if addr_data is None: return None prefixed_data = addr_data[:-4] checksum = addr_data[-4:] if blake256(blake256(prefixed_data))[:4] != checksum: raise ValueError('Checksum mismatch') return prefixed_data def decodeAddress(self, address: str) -> bytes: return self.decode_address(address)[2:] def testDaemonRPC(self, with_wallet=True) -> None: if with_wallet: self.rpc_wallet('getinfo') else: self.rpc('getblockchaininfo') def getChainHeight(self) -> int: return self.rpc('getblockcount') def checkWallets(self) -> int: # Only one wallet possible? return 1 def initialiseWallet(self, key: bytes) -> None: # Load with --create pass def getDaemonVersion(self): return self.rpc('getnetworkinfo')['version'] def getBlockchainInfo(self): return self.rpc('getblockchaininfo') def getWalletInfo(self): rv = {} rv = self.rpc_wallet('getinfo') wi = self.rpc_wallet('walletinfo') balances = self.rpc_wallet('getbalance') default_account_bal = balances['balances'][0] # 0 always default? rv['balance'] = default_account_bal['spendable'] rv['unconfirmed_balance'] = default_account_bal['unconfirmed'] rv['immature_balance'] = default_account_bal['immaturecoinbaserewards'] + default_account_bal['immaturestakegeneration'] rv['encrypted'] = True rv['locked'] = True if wi['unlocked'] is False else False return rv def getSpendableBalance(self) -> int: balances = self.rpc_wallet('getbalance') default_account_bal = balances['balances'][0] # 0 always default? return self.make_int(default_account_bal['spendable']) def getSeedHash(self, seed: bytes) -> bytes: # m / purpose' / coin_type' / account' / change / address_index # m/44'/coin_type'/0'/0/0 ek = ExtKeyPair(self.coin_type()) ek.set_seed(seed) coin_type = self.chainparams_network()['bip44'] ek_purpose = ek.derive(44 | (1 << 31)) ek_coin = ek_purpose.derive(coin_type | (1 << 31)) ek_account = ek_coin.derive(0 | (1 << 31)) return hash160(ek_account.encode_p()) def decodeKey(self, encoded_key: str) -> (int, bytes): key = b58decode(encoded_key) checksum = key[-4:] key = key[:-4] if blake256(key)[:4] != checksum: 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) return tx def signTx(self, key_bytes: bytes, tx_bytes: bytes, input_n: int, prevout_script: bytes, prevout_value: int) -> bytes: tx = self.loadTx(tx_bytes) sig_hash = DCRSignatureHash(prevout_script, SigHashType.SigHashAll, tx, input_n) eck = PrivateKey(key_bytes) return eck.sign(sig_hash, hasher=None) + bytes((SigHashType.SigHashAll,)) 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() def stripTxSignature(self, tx_bytes) -> bytes: tx = self.loadTx(tx_bytes) return tx.serialize(TxSerializeType.NoWitness) def getTxSignature(self, tx_hex: str, prevout_data, key_wif: str) -> str: sig_type, key = self.decodeKey(key_wif) redeem_script = bytes.fromhex(prevout_data['redeemScript']) sig = self.signTx(key, bytes.fromhex(tx_hex), 0, redeem_script, self.make_int(prevout_data['amount'])) 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) assert len(script_hash) == 20 return OP_HASH160.to_bytes(1) + len(script_hash).to_bytes(1) + script_hash + OP_EQUAL.to_bytes(1) def encodeScriptDest(self, script_dest: bytes) -> str: script_hash = script_dest[2:-1] # Extract hash from script return self.sh_to_address(script_hash) 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) def getPkDest(self, K: bytes) -> bytearray: return self.getPubkeyHashDest(self.pkh(K)) def getSCLockScriptAddress(self, lock_script: bytes) -> str: lock_tx_dest = self.getScriptDest(lock_script) return self.encodeScriptDest(lock_tx_dest) def get_fee_rate(self, conf_target: int = 2) -> (float, str): chain_client_settings = self._sc.getChainClientSettings(self.coin_type()) # basicswap.json override_feerate = chain_client_settings.get('override_feerate', None) if override_feerate: self._log.debug('Fee rate override used for %s: %f', self.coin_name(), override_feerate) return override_feerate, 'override_feerate' min_relay_fee = chain_client_settings.get('min_relay_fee', None) def try_get_fee_rate(self, conf_target): # TODO: How to estimate required fee? try: fee_rate: float = self.rpc_wallet('walletinfo')['txfee'] assert (fee_rate > 0.0), 'Non positive feerate' return fee_rate, 'paytxfee' except Exception: fee_rate: float = self.rpc('getnetworkinfo')['relayfee'] return fee_rate, 'relayfee' fee_rate, rate_src = try_get_fee_rate(self, conf_target) if min_relay_fee and min_relay_fee > fee_rate: self._log.warning('Feerate {} ({}) is below min relay fee {} for {}'.format(self.format_amount(fee_rate, True, 1), rate_src, self.format_amount(min_relay_fee, True, 1), self.coin_name())) return min_relay_fee, 'min_relay_fee' return fee_rate, rate_src def getNewAddress(self, use_segwit: bool = True, label: str = 'swap_receive') -> str: return self.rpc_wallet('getnewaddress') def getProofOfFunds(self, amount_for, extra_commit_bytes): # TODO: Lock unspent and use same output/s to fund bid unspents_by_addr = dict() unspents = self.rpc_wallet('listunspent') if unspents is None: unspents = [] for u in unspents: if u['spendable'] is not True: continue if u['address'] not in unspents_by_addr: unspents_by_addr[u['address']] = {'total': 0, 'utxos': []} utxo_amount: int = self.make_int(u['amount'], r=1) unspents_by_addr[u['address']]['total'] += utxo_amount unspents_by_addr[u['address']]['utxos'].append((utxo_amount, u['txid'], u['vout'], u['tree'])) max_utxos: int = 4 viable_addrs = [] for addr, data in unspents_by_addr.items(): if data['total'] >= amount_for: # Sort from largest to smallest amount sorted_utxos = sorted(data['utxos'], key=lambda x: x[0]) # Max outputs required to reach amount_for utxos_req: int = 0 sum_value: int = 0 for utxo in sorted_utxos: sum_value += utxo[0] utxos_req += 1 if sum_value >= amount_for: break if utxos_req <= max_utxos: viable_addrs.append(addr) continue ensure(len(viable_addrs) > 0, 'Could not find address with enough funds for proof') sign_for_addr: str = random.choice(viable_addrs) self._log.debug('sign_for_addr %s', sign_for_addr) prove_utxos = [] sorted_utxos = sorted(unspents_by_addr[sign_for_addr]['utxos'], key=lambda x: x[0]) hasher = hashlib.sha256() sum_value: int = 0 for utxo in sorted_utxos: sum_value += utxo[0] outpoint = (bytes.fromhex(utxo[1]), utxo[2], utxo[3]) prove_utxos.append(outpoint) hasher.update(outpoint[0]) hasher.update(outpoint[1].to_bytes(2, 'big')) hasher.update(outpoint[2].to_bytes(1)) if sum_value >= amount_for: break utxos_hash = hasher.digest() signature = self.rpc_wallet('signmessage', [sign_for_addr, sign_for_addr + '_swap_proof_' + utxos_hash.hex() + extra_commit_bytes.hex()]) return (sign_for_addr, signature, prove_utxos) def withdrawCoin(self, value: float, addr_to: str, subfee: bool = False) -> str: if subfee: raise ValueError('TODO') params = [addr_to, value] return self.rpc_wallet('sendtoaddress', params) def isAddressMine(self, address: str, or_watch_only: bool = False) -> bool: addr_info = self.rpc_wallet('validateaddress', [address]) return addr_info.get('ismine', False) def encodeProofUtxos(self, proof_utxos): packed_utxos = bytes() for utxo in proof_utxos: packed_utxos += utxo[0] + utxo[1].to_bytes(2, 'big') + utxo[2].to_bytes(1) return packed_utxos def decodeProofUtxos(self, msg_utxos): proof_utxos = [] if len(msg_utxos) > 0: num_utxos = len(msg_utxos) // 34 p: int = 0 for i in range(num_utxos): proof_utxos.append((msg_utxos[p: p + 32], int.from_bytes(msg_utxos[p + 32: p + 34], 'big'), msg_utxos[p + 34])) p += 35 return proof_utxos def verifyProofOfFunds(self, address: str, signature: bytes, utxos, extra_commit_bytes: bytes): hasher = hashlib.sha256() sum_value: int = 0 for outpoint in utxos: hasher.update(outpoint[0]) hasher.update(outpoint[1].to_bytes(2, 'big')) hasher.update(outpoint[2].to_bytes(1)) utxos_hash = hasher.digest() passed = self.verifyMessage(address, address + '_swap_proof_' + utxos_hash.hex() + extra_commit_bytes.hex(), signature) ensure(passed is True, 'Proof of funds signature invalid') sum_value: int = 0 for outpoint in utxos: txout = self.rpc('gettxout', [outpoint[0].hex(), outpoint[1], outpoint[2]]) sum_value += self.make_int(txout['value']) return sum_value def signCompact(self, k, message): message_hash = blake256(bytes(message, 'utf-8')) privkey = PrivateKey(k) return privkey.sign_recoverable(message_hash, hasher=None)[:64] def signRecoverable(self, k, message: str) -> bytes: message_hash = blake256(bytes(message, 'utf-8')) privkey = PrivateKey(k) return privkey.sign_recoverable(message_hash, hasher=None) def verifyCompactSig(self, K, message: str, sig) -> None: message_hash = blake256(bytes(message, 'utf-8')) pubkey = PublicKey(K) rv = pubkey.verify_compact(sig, message_hash, hasher=None) assert (rv is True) def verifySigAndRecover(self, sig, message: str) -> bytes: message_hash = blake256(bytes(message, 'utf-8')) pubkey = PublicKey.from_signature_and_message(sig, message_hash, hasher=None) return pubkey.format() def verifyMessage(self, address: str, message: str, signature: str, message_magic: str = None) -> bool: if message_magic is None: message_magic = self.chainparams()['message_magic'] message_bytes = SerialiseNumCompact(len(message_magic)) + bytes(message_magic, 'utf-8') + SerialiseNumCompact(len(message)) + bytes(message, 'utf-8') message_hash = blake256(message_bytes) signature_bytes = base64.b64decode(signature) rec_id = (signature_bytes[0] - 27) & 3 signature_bytes = signature_bytes[1:] + bytes((rec_id,)) try: pubkey = PublicKey.from_signature_and_message(signature_bytes, message_hash, hasher=None) except Exception as e: self._log.info('verifyMessage failed: ' + str(e)) return False address_hash = self.decode_address(address)[2:] pubkey_hash = ripemd160(blake256(pubkey.format())) return True if address_hash == pubkey_hash else False def signTxWithWallet(self, tx) -> bytes: return bytes.fromhex(self.rpc_wallet('signrawtransaction', [tx.hex()])['hex']) def signTxWithKey(self, tx: bytes, key: bytes) -> bytes: key_wif = self.encodeKey(key) rv = self.rpc_wallet('signrawtransaction', [tx.hex(), [], [key_wif, ]]) return bytes.fromhex(rv['hex']) def createRawFundedTransaction(self, addr_to: str, amount: int, sub_fee: bool = False, lock_unspents: bool = True) -> str: # amount can't be a string, else: Failed to parse request: parameter #2 'amounts' must be type float64 (got string) float_amount = float(self.format_amount(amount)) txn = self.rpc('createrawtransaction', [[], {addr_to: float_amount}]) fee_rate, fee_src = self.get_fee_rate(self._conf_target) self._log.debug(f'Fee rate: {fee_rate}, source: {fee_src}, block target: {self._conf_target}') options = { 'lockUnspents': lock_unspents, 'feeRate': fee_rate, } if sub_fee: options['subtractFeeFromOutputs'] = [0,] return self.rpc_wallet('fundrawtransaction', [txn, 'default', options])['hex'] def createRawSignedTransaction(self, addr_to, amount) -> str: 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, vout: int = -1): if txid is 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 if found_vout is None: 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 = { 'txid': txid.hex(), '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': txo['scriptPubKey']['hex'], 'redeemScript': txn_script.hex(), '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 = b2i(bytes.fromhex(prevout['txid'])) 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 = b2i(bytes.fromhex(prevout['txid'])) 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 getBlockHeaderAt(self, time: int, block_after=False): blockchaininfo = self.rpc('getblockchaininfo') last_block_header = self.rpc('getblockheader', [blockchaininfo['bestblockhash']]) max_tries = 5000 for i in range(max_tries): prev_block_header = self.rpc('getblockheader', [last_block_header['previousblockhash']]) if prev_block_header['time'] <= time: return last_block_header if block_after else prev_block_header last_block_header = prev_block_header raise ValueError(f'Block header not found at time: {time}') def getMempoolTx(self, txid): raise ValueError('TODO') 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]) def fundTx(self, tx: bytes, feerate) -> bytes: feerate_str = float(self.format_amount(feerate)) # TODO: unlock unspents if bid cancelled options = { 'feeRate': feerate_str, } rv = self.rpc_wallet('fundrawtransaction', [tx.hex(), 'default', options]) tx_bytes = bytes.fromhex(rv['hex']) tx_obj = self.loadTx(tx_bytes) for txi in tx_obj.vin: utxos = [{'amount': float(self.format_amount(txi.value_in)), 'txid': i2h(txi.prevout.hash), 'vout': txi.prevout.n, 'tree': txi.prevout.tree}] rv = self.rpc_wallet('lockunspent', [False, utxos]) return tx_bytes def createSCLockTx(self, value: int, script: bytearray, vkbv: bytes = None) -> bytes: tx = CTransaction() tx.version = self.txVersion() tx.vout.append(self.txoType()(value, self.getScriptDest(script))) return tx.serialize() def fundSCLockTx(self, tx_bytes, feerate, vkbv=None): return self.fundTx(tx_bytes, feerate) def genScriptLockRefundTxScript(self, Kal, Kaf, csv_val) -> bytes: Kal_enc = Kal if len(Kal) == 33 else self.encodePubkey(Kal) Kaf_enc = Kaf if len(Kaf) == 33 else self.encodePubkey(Kaf) script = bytearray() script += OP_IF.to_bytes(1) push_script_data(script, bytes((2,))) push_script_data(script, Kal_enc) push_script_data(script, Kaf_enc) push_script_data(script, bytes((2,))) script += OP_CHECKMULTISIG.to_bytes(1) script += OP_ELSE.to_bytes(1) script += CScriptNum.encode(CScriptNum(csv_val)) script += OP_CHECKSEQUENCEVERIFY.to_bytes(1) script += OP_DROP.to_bytes(1) push_script_data(script, Kaf_enc) script += OP_CHECKSIG.to_bytes(1) script += OP_ENDIF.to_bytes(1) return script def createSCLockSpendTx(self, tx_lock_bytes, script_lock, pkh_dest, tx_fee_rate, vkbv=None, fee_info={}): tx_lock = self.loadTx(tx_lock_bytes) output_script = self.getScriptDest(script_lock) locked_n = findOutput(tx_lock, output_script) ensure(locked_n is not None, 'Output not found in tx') locked_coin = tx_lock.vout[locked_n].value tx_lock_id_int = b2i(tx_lock.TxHash()) tx = CTransaction() tx.version = self.txVersion() tx.vin.append(CTxIn(COutPoint(tx_lock_id_int, locked_n, 0))) tx.vout.append(self.txoType()(locked_coin, self.getPubkeyHashDest(pkh_dest))) dummy_witness_stack = self.getScriptLockTxDummyWitness(script_lock) size = len(self.setTxSignature(tx.serialize(), dummy_witness_stack)) pay_fee = round(tx_fee_rate * size / 1000) tx.vout[0].value = locked_coin - pay_fee fee_info['fee_paid'] = pay_fee fee_info['rate_used'] = tx_fee_rate fee_info['size'] = size self._log.info('createSCLockSpendTx %s:\n fee_rate, size, fee: %ld, %ld, %ld.', tx.TxHash().hex(), tx_fee_rate, size, pay_fee) return tx.serialize(TxSerializeType.NoWitness) def createSCLockRefundTx(self, tx_lock_bytes, script_lock, Kal, Kaf, lock1_value, csv_val, tx_fee_rate, vkbv=None): tx_lock = CTransaction() tx_lock = self.loadTx(tx_lock_bytes) output_script = self.getScriptDest(script_lock) locked_n = findOutput(tx_lock, output_script) ensure(locked_n is not None, 'Output not found in tx') locked_coin = tx_lock.vout[locked_n].value tx_lock_id_int = b2i(tx_lock.TxHash()) refund_script = self.genScriptLockRefundTxScript(Kal, Kaf, csv_val) tx = CTransaction() tx.version = self.txVersion() tx.vin.append(CTxIn(COutPoint(tx_lock_id_int, locked_n, 0), sequence=lock1_value)) tx.vout.append(self.txoType()(locked_coin, self.getScriptDest(refund_script))) dummy_witness_stack = self.getScriptLockTxDummyWitness(script_lock) size = len(self.setTxSignature(tx.serialize(), dummy_witness_stack)) pay_fee = round(tx_fee_rate * size / 1000) tx.vout[0].value = locked_coin - pay_fee self._log.info('createSCLockRefundTx %s:\n fee_rate, size, fee: %ld, %ld, %ld.', tx.TxHash().hex(), tx_fee_rate, size, pay_fee) return tx.serialize(TxSerializeType.NoWitness), refund_script, tx.vout[0].value def createSCLockRefundSpendTx(self, tx_lock_refund_bytes, script_lock_refund, pkh_refund_to, tx_fee_rate, vkbv=None): # Returns the coinA locked coin to the leader # The follower will sign the multisig path with a signature encumbered by the leader's coinB spend pubkey # If the leader publishes the decrypted signature the leader's coinB spend privatekey will be revealed to the follower tx_lock_refund = self.loadTx(tx_lock_refund_bytes) output_script = self.getScriptDest(script_lock_refund) locked_n = findOutput(tx_lock_refund, output_script) ensure(locked_n is not None, 'Output not found in tx') locked_coin = tx_lock_refund.vout[locked_n].value tx_lock_refund_hash_int = b2i(tx_lock_refund.TxHash()) tx = CTransaction() tx.version = self.txVersion() tx.vin.append(CTxIn(COutPoint(tx_lock_refund_hash_int, locked_n, 0), sequence=0)) tx.vout.append(self.txoType()(locked_coin, self.getPubkeyHashDest(pkh_refund_to))) dummy_witness_stack = self.getScriptLockRefundSpendTxDummyWitness(script_lock_refund) size = len(self.setTxSignature(tx.serialize(), dummy_witness_stack)) pay_fee = round(tx_fee_rate * size / 1000) tx.vout[0].value = locked_coin - pay_fee self._log.info('createSCLockRefundSpendTx %s:\n fee_rate, size, fee: %ld, %ld, %ld.', tx.TxHash().hex(), tx_fee_rate, size, pay_fee) return tx.serialize(TxSerializeType.NoWitness) def verifySCLockTx(self, tx_bytes, script_out, swap_value, Kal, Kaf, feerate, check_lock_tx_inputs, vkbv=None): # Verify: # # Not necessary to check the lock txn is mineable, as protocol will wait for it to confirm # However by checking early we can avoid wasting time processing unmineable txns # Check fee is reasonable tx = self.loadTx(tx_bytes) txid = self.getTxid(tx) self._log.info('Verifying lock tx: {}.'.format(b2h(txid))) ensure(tx.version == self.txVersion(), 'Bad version') ensure(tx.locktime == 0, 'Bad locktime') ensure(tx.expiry == 0, 'Bad expiry') script_pk = self.getScriptDest(script_out) locked_n = findOutput(tx, script_pk) ensure(locked_n is not None, 'Lock output not found in tx') locked_coin = tx.vout[locked_n].value # Check value ensure(locked_coin == swap_value, 'Bad locked value') # Check script A, B = extractScriptLockScriptValues(script_out) ensure(A == Kal, 'Bad script pubkey') ensure(B == Kaf, 'Bad script pubkey') if check_lock_tx_inputs: # TODO: Check that inputs are unspent # Verify fee rate inputs_value = 0 add_bytes = 0 add_witness_bytes = 0 for pi in tx.vin: ptx = self.rpc('getrawtransaction', [i2h(pi.prevout.hash), True]) prevout = ptx['vout'][pi.prevout.n] inputs_value += self.make_int(prevout['value']) self._log.info('prevout: {}.'.format(prevout)) prevout_type = prevout['scriptPubKey']['type'] ''' if prevout_type == 'witness_v0_keyhash': #add_witness_bytes += 107 # sig 72, pk 33 and 2 size bytes #add_witness_bytes += getCompactSizeLen(107) else: # Assume P2PKH, TODO more types add_bytes += 107 # OP_PUSH72 OP_PUSH33 ''' outputs_value = 0 for txo in tx.vout: outputs_value += txo.nValue fee_paid = inputs_value - outputs_value assert (fee_paid > 0) size = len(tx.serialize()) + add_witness_bytes fee_rate_paid = fee_paid * 1000 // size self._log.info('tx amount, size, feerate: %ld, %ld, %ld', locked_coin, size, fee_rate_paid) if not self.compareFeeRates(fee_rate_paid, feerate): self._log.warning('feerate paid doesn\'t match expected: %ld, %ld', fee_rate_paid, feerate) # TODO: Display warning to user return txid, locked_n def verifySCLockSpendTx(self, tx_bytes, lock_tx_bytes, lock_tx_script, a_pkhash_f, feerate, vkbv=None): # Verify: # Must have only one input with correct prevout (n is always 0) and sequence # Must have only one output with destination and amount tx = self.loadTx(tx_bytes) txid = self.getTxid(tx) self._log.info('Verifying lock spend tx: {}.'.format(b2h(txid))) ensure(tx.version == self.txVersion(), 'Bad version') ensure(tx.locktime == 0, 'Bad locktime') ensure(tx.expiry == 0, 'Bad expiry') ensure(len(tx.vin) == 1, 'tx doesn\'t have one input') lock_tx = self.loadTx(lock_tx_bytes) lock_tx_id = self.getTxid(lock_tx) output_script = self.getScriptDest(lock_tx_script) locked_n = findOutput(lock_tx, output_script) ensure(locked_n is not None, 'Output not found in tx') locked_coin = lock_tx.vout[locked_n].value ensure(tx.vin[0].sequence == 0, 'Bad input nSequence') ensure(len(tx.vin[0].signature_script) == 0, 'Input sig not empty') ensure(i2b(tx.vin[0].prevout.hash) == lock_tx_id and tx.vin[0].prevout.n == locked_n, 'Input prevout mismatch') ensure(len(tx.vout) == 1, 'tx doesn\'t have one output') p2wpkh = self.getPubkeyHashDest(a_pkhash_f) ensure(tx.vout[0].script_pubkey == p2wpkh, 'Bad output destination') # The value of the lock tx output should already be verified, if the fee is as expected the difference will be the correct amount fee_paid = locked_coin - tx.vout[0].value assert (fee_paid > 0) dummy_witness_stack = self.getScriptLockTxDummyWitness(lock_tx_script) size = len(self.setTxSignature(tx.serialize(), dummy_witness_stack)) fee_rate_paid = fee_paid * 1000 // size self._log.info('tx amount, size, feerate: %ld, %ld, %ld', tx.vout[0].value, size, fee_rate_paid) if not self.compareFeeRates(fee_rate_paid, feerate): raise ValueError('Bad fee rate, expected: {}'.format(feerate)) return True def verifySCLockRefundTx(self, tx_bytes, lock_tx_bytes, script_out, prevout_id, prevout_n, prevout_seq, prevout_script, Kal, Kaf, csv_val_expect, swap_value, feerate, vkbv=None): # Verify: # Must have only one input with correct prevout and sequence # Must have only one output to the p2wsh of the lock refund script # Output value must be locked_coin - lock tx fee tx = self.loadTx(tx_bytes) txid = self.getTxid(tx) self._log.info('Verifying lock refund tx: {}.'.format(b2h(txid))) ensure(tx.version == self.txVersion(), 'Bad version') ensure(tx.locktime == 0, 'locktime not 0') ensure(tx.expiry == 0, 'Bad expiry') ensure(len(tx.vin) == 1, 'tx doesn\'t have one input') ensure(tx.vin[0].sequence == prevout_seq, 'Bad input sequence') ensure(i2b(tx.vin[0].prevout.hash) == prevout_id and tx.vin[0].prevout.n == prevout_n and tx.vin[0].prevout.tree == 0, 'Input prevout mismatch') ensure(len(tx.vin[0].signature_script) == 0, 'Input sig not empty') ensure(len(tx.vout) == 1, 'tx doesn\'t have one output') script_pk = self.getScriptDest(script_out) locked_n = findOutput(tx, script_pk) ensure(locked_n is not None, 'Output not found in tx') locked_coin = tx.vout[locked_n].value # Check script and values A, B, csv_val, C = extractScriptLockRefundScriptValues(script_out) ensure(A == Kal, 'Bad script pubkey') ensure(B == Kaf, 'Bad script pubkey') ensure(csv_val == csv_val_expect, 'Bad script csv value') ensure(C == Kaf, 'Bad script pubkey') fee_paid = swap_value - locked_coin assert (fee_paid > 0) dummy_witness_stack = self.getScriptLockTxDummyWitness(prevout_script) size = len(self.setTxSignature(tx.serialize(), dummy_witness_stack)) fee_rate_paid = fee_paid * 1000 // size self._log.info('tx amount, size, feerate: %ld, %ld, %ld', locked_coin, size, fee_rate_paid) if not self.compareFeeRates(fee_rate_paid, feerate): raise ValueError('Bad fee rate, expected: {}'.format(feerate)) return txid, locked_coin, locked_n def verifySCLockRefundSpendTx(self, tx_bytes, lock_refund_tx_bytes, lock_refund_tx_id, prevout_script, Kal, prevout_n, prevout_value, feerate, vkbv=None): # Verify: # Must have only one input with correct prevout (n is always 0) and sequence # Must have only one output sending lock refund tx value - fee to leader's address, TODO: follower shouldn't need to verify destination addr tx = self.loadTx(tx_bytes) txid = self.getTxid(tx) self._log.info('Verifying lock refund spend tx: {}.'.format(b2h(txid))) ensure(tx.version == self.txVersion(), 'Bad version') ensure(tx.locktime == 0, 'locktime not 0') ensure(tx.expiry == 0, 'Bad expiry') ensure(len(tx.vin) == 1, 'tx doesn\'t have one input') ensure(tx.vin[0].sequence == 0, 'Bad input sequence') ensure(len(tx.vin[0].signature_script) == 0, 'Input sig not empty') ensure(i2b(tx.vin[0].prevout.hash) == lock_refund_tx_id and tx.vin[0].prevout.n == 0 and tx.vin[0].prevout.tree == 0, 'Input prevout mismatch') ensure(len(tx.vout) == 1, 'tx doesn\'t have one output') # Destination doesn't matter to the follower ''' p2wpkh = CScript([OP_0, hash160(Kal)]) locked_n = findOutput(tx, p2wpkh) ensure(locked_n is not None, 'Output not found in lock refund spend tx') ''' tx_value = tx.vout[0].value fee_paid = prevout_value - tx_value assert (fee_paid > 0) dummy_witness_stack = self.getScriptLockRefundSpendTxDummyWitness(prevout_script) size = len(self.setTxSignature(tx.serialize(), dummy_witness_stack)) fee_rate_paid = fee_paid * 1000 // size self._log.info('tx amount, size, feerate: %ld, %ld, %ld', tx_value, size, fee_rate_paid) if not self.compareFeeRates(fee_rate_paid, feerate): raise ValueError('Bad fee rate, expected: {}'.format(feerate)) return True def createSCLockRefundSpendToFTx(self, tx_lock_refund_bytes, script_lock_refund, pkh_dest, tx_fee_rate, vkbv=None): # lock refund swipe tx # Sends the coinA locked coin to the follower tx_lock_refund = self.loadTx(tx_lock_refund_bytes) output_script = self.getScriptDest(script_lock_refund) locked_n = findOutput(tx_lock_refund, output_script) ensure(locked_n is not None, 'Output not found in tx') locked_amount = tx_lock_refund.vout[locked_n].value A, B, lock2_value, C = extractScriptLockRefundScriptValues(script_lock_refund) tx_lock_refund_hash_int = b2i(tx_lock_refund.TxHash()) tx = CTransaction() tx.version = self.txVersion() tx.vin.append(CTxIn(COutPoint(tx_lock_refund_hash_int, locked_n, 0), sequence=lock2_value,)) tx.vout.append(self.txoType()(locked_amount, self.getPubkeyHashDest(pkh_dest))) dummy_witness_stack = self.getScriptLockRefundSwipeTxDummyWitness(script_lock_refund) size = len(self.setTxSignature(tx.serialize(), dummy_witness_stack)) pay_fee = round(tx_fee_rate * size / 1000) tx.vout[0].value = locked_amount - pay_fee self._log.info('createSCLockRefundSpendToFTx %s:\n fee_rate, size, fee: %ld, %ld, %ld.', tx.TxHash().hex(), tx_fee_rate, size, pay_fee) return tx.serialize(TxSerializeType.NoWitness) def signTxOtVES(self, key_sign: bytes, pubkey_encrypt: bytes, tx_bytes: bytes, input_n: int, prevout_script: bytes, prevout_value: int) -> bytes: tx = self.loadTx(tx_bytes) sig_hash = DCRSignatureHash(prevout_script, SigHashType.SigHashAll, tx, input_n) return ecdsaotves_enc_sign(key_sign, pubkey_encrypt, sig_hash) def verifyTxOtVES(self, tx_bytes: bytes, ct: bytes, Ks: bytes, Ke: bytes, input_n: int, prevout_script: bytes, prevout_value): tx = self.loadTx(tx_bytes) sig_hash = DCRSignatureHash(prevout_script, SigHashType.SigHashAll, tx, input_n) return ecdsaotves_enc_verify(Ks, Ke, sig_hash, ct) def decryptOtVES(self, k: bytes, esig: bytes) -> bytes: return ecdsaotves_dec_sig(k, esig) + bytes((SigHashType.SigHashAll,)) def recoverEncKey(self, esig, sig, K): return ecdsaotves_rec_enc_key(K, esig, sig[:-1]) # Strip sighash type def getTxOutputPos(self, tx, script): if isinstance(tx, bytes): tx = self.loadTx(tx) script_pk = self.getScriptDest(script) return findOutput(tx, script_pk) def getScriptLockTxDummyWitness(self, script: bytes): return [ bytes(72), bytes(72), bytes(len(script)) ] def getScriptLockRefundSpendTxDummyWitness(self, script: bytes): return [ bytes(72), bytes(72), bytes((1,)), bytes(len(script)) ] def extractLeaderSig(self, tx_bytes: bytes) -> bytes: tx = self.loadTx(tx_bytes) sig_len = tx.vin[0].signature_script[0] return tx.vin[0].signature_script[1: 1 + sig_len] def extractFollowerSig(self, tx_bytes: bytes) -> bytes: tx = self.loadTx(tx_bytes) sig_len = tx.vin[0].signature_script[0] ofs = 1 + sig_len sig_len = tx.vin[0].signature_script[ofs] ofs += 1 return tx.vin[0].signature_script[ofs: ofs + sig_len] def unlockInputs(self, tx_bytes): tx = self.loadTx(tx_bytes) inputs = [] for txi in tx.vin: inputs.append({'amount': float(self.format_amount(txi.value_in)), 'txid': i2h(txi.prevout.hash), 'vout': txi.prevout.n, 'tree': txi.prevout.tree}) self.rpc_wallet('lockunspent', [True, inputs]) def getWalletRestoreHeight(self) -> int: start_time = self.rpc_wallet('getinfo')['keypoololdest'] blockchaininfo = self.getBlockchainInfo() best_block = blockchaininfo['bestblockhash'] chain_synced = round(blockchaininfo['verificationprogress'], 3) if chain_synced < 1.0: raise ValueError('{} chain isn\'t synced.'.format(self.coin_name())) self._log.debug('Finding block at time: {}'.format(start_time)) rpc_conn = self.open_rpc() try: block_hash = best_block while True: block_header = self.json_request(rpc_conn, 'getblockheader', [block_hash]) if block_header['time'] < start_time: return block_header['height'] # genesis block if block_header['previousblockhash'] == '0000000000000000000000000000000000000000000000000000000000000000': return block_header['height'] block_hash = block_header['previousblockhash'] finally: self.close_rpc(rpc_conn) raise ValueError('{} wallet restore height not found.'.format(self.coin_name())) def createBLockTx(self, Kbs, output_amount, vkbv=None) -> bytes: tx = CTransaction() tx.version = self.txVersion() script_pk = self.getPkDest(Kbs) tx.vout.append(self.txoType()(output_amount, script_pk)) return tx.serialize() def publishBLockTx(self, kbv, Kbs, output_amount, feerate, unlock_time: int = 0) -> bytes: b_lock_tx = self.createBLockTx(Kbs, output_amount) b_lock_tx = self.fundTx(b_lock_tx, feerate) b_lock_tx_id = self.getTxid(b_lock_tx) b_lock_tx = self.signTxWithWallet(b_lock_tx) return bytes.fromhex(self.publishTx(b_lock_tx)) def getBLockSpendTxFee(self, tx, fee_rate: int) -> int: witness_bytes = 120 # TODO size = len(tx.serialize()) + witness_bytes pay_fee = round(fee_rate * size / 1000) self._log.info(f'BLockSpendTx fee_rate, vsize, fee: {fee_rate}, {size}, {pay_fee}.') return pay_fee def spendBLockTx(self, chain_b_lock_txid: bytes, address_to: str, kbv: bytes, kbs: bytes, cb_swap_value: int, b_fee: int, restore_height: int, lock_tx_vout=None) -> bytes: self._log.info('spendBLockTx %s:\n', chain_b_lock_txid.hex()) locked_n = lock_tx_vout Kbs = self.getPubkey(kbs) script_pk = self.getPkDest(Kbs) if locked_n is None: self._log.debug(f'Unknown lock vout, searching tx: {chain_b_lock_txid.hex()}') # When refunding a lock tx, it should be in the wallet as a sent tx wtx = self.rpc_wallet('gettransaction', [chain_b_lock_txid.hex(), ]) lock_tx = self.loadTx(bytes.fromhex(wtx['hex'])) locked_n = findOutput(lock_tx, script_pk) ensure(locked_n is not None, 'Output not found in tx') pkh_to = self.decodeAddress(address_to) tx = CTransaction() tx.version = self.txVersion() chain_b_lock_txid_int = b2i(chain_b_lock_txid) tx.vin.append(CTxIn(COutPoint(chain_b_lock_txid_int, locked_n, 0), sequence=0)) tx.vout.append(self.txoType()(cb_swap_value, self.getPubkeyHashDest(pkh_to))) pay_fee = self.getBLockSpendTxFee(tx, b_fee) tx.vout[0].value = cb_swap_value - pay_fee b_lock_spend_tx = tx.serialize() b_lock_spend_tx = self.signTxWithKey(b_lock_spend_tx, kbs) return bytes.fromhex(self.publishTx(b_lock_spend_tx)) def findTxnByHash(self, txid_hex: str): try: txout = self.rpc('gettxout', [txid_hex, 0, 0, True]) except Exception as e: # self._log.warning('gettxout {}'.format(e)) return None confirmations: int = 0 if 'confirmations' not in txout else txout['confirmations'] if confirmations >= self.blocks_confirmed: block_height = self.getChainHeight() - confirmations # TODO: Better way? return {'txid': txid_hex, 'amount': 0, 'height': block_height} return None def isTxExistsError(self, err_str: str) -> bool: return 'transaction already exists' in err_str or 'already have transaction' in err_str def isTxNonFinalError(self, err_str: str) -> bool: return 'locks on inputs not met' in err_str