Perform-Bitcoin-transactions-using-python-bitcoinlib/Q4.py at main · QianCyrus/Perform-Bitcoin-transactions-using-python-bitcoinlib · GitHub

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from bitcoin.core.script import *
from bitcoin.core import Hash160

######################################################################
# These functions will be used by Alice and Bob to send their respective
# coins to a utxo that is redeemable either of two cases:
# 1) Recipient provides x such that hash(x) = hash of secret
#    and recipient signs the transaction.
# 2) Sender and recipient both sign transaction
#
# TODO: Fill these in to create scripts that are redeemable by both
#       of the above conditions.
# See this page for opcode documentation: https://en.bitcoin.it/wiki/Script

# This is the ScriptPubKey for the swap transaction
def coinExchangeScript(public_key_sender, public_key_recipient, hash_of_secret):
    return [
        OP_IF,
            # Recipient can redeem with secret
            OP_SHA256,
            hash_of_secret,
            OP_EQUALVERIFY,
            OP_DUP,
            OP_HASH160,
            Hash160(public_key_recipient),
        OP_ELSE,
            # Both parties can redeem after timelock
            OP_2,
            public_key_sender,
            public_key_recipient,
            OP_2,
            OP_CHECKMULTISIG,
            OP_VERIFY,
            OP_DUP,
            OP_HASH160,
            Hash160(public_key_sender),
        OP_ENDIF,
        OP_EQUALVERIFY,
        OP_CHECKSIG,
    ]

# This is the ScriptSig that the receiver will use to redeem coins
def coinExchangeScriptSig1(sig_recipient, secret):
    return [
        sig_recipient,
        secret,
        OP_TRUE,
    ]

# This is the ScriptSig for sending coins back to the sender if unredeemed
def coinExchangeScriptSig2(sig_sender, sig_recipient):
    return [
        sig_sender,
        sig_recipient,
        OP_FALSE,
    ]
######################################################################

######################################################################
#
# Configured for your addresses
#
# TODO: Fill in all of these fields
#

alice_txid_to_spend     = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
alice_utxo_index        = None
alice_amount_to_send    = None

bob_txid_to_spend       = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
bob_utxo_index          = None
bob_amount_to_send      = None

# Get current block height (for locktime) in 'height' parameter for each blockchain (will be used in swap.py):
#  curl https://api.blockcypher.com/v1/btc/test3
btc_test3_chain_height  = 1579945

#  curl https://api.blockcypher.com/v1/bcy/test
bcy_test_chain_height   = 2548698

# Parameter for how long Alice/Bob should have to wait before they can take back their coins
# alice_locktime MUST be > bob_locktime
alice_locktime = 5
bob_locktime = 3

tx_fee = 0.0001

# While testing your code, you can edit these variables to see if your
# transaction can be broadcasted succesfully.
broadcast_transactions = False
alice_redeems = False

######################################################################