def change_fee_spend_amounts(
self, tx, inp_amount, policy,
currentnetwork) -> (float, float, float, str, float, float):
spend = 0
change = 0
destinationaddress = ""
dest_addr_cnt = 0
outs = 0
for i, out in enumerate(tx.outputs):
outs += 1
out_policy = self.get_policy(out, tx.tx.vout[i].script_pubkey,
tx.xpubs)
is_change = False
# if policy is the same - probably change
if out_policy == policy:
# double-check that it's change
# we already checked in get_cosigners and parse_multisig
# that pubkeys are generated from cosigners,
# and witness script is corresponding multisig
# so we only need to check that scriptpubkey is generated from
# witness script
# empty script by default
sc = script.Script(b"")
# multisig, we know witness script
if policy["type"] == "p2wsh":
sc = script.p2wsh(out.witness_script)
elif policy["type"] == "p2sh-p2wsh":
sc = script.p2sh(script.p2wsh(out.witness_script))
# single-sig native segwit
elif "pkh" in policy["type"]:
for pub in out.bip32_derivations:
# check if it is our key
if out.bip32_derivations[
pub].fingerprint == self.fingerprint:
hdkey = self.root.derive(
out.bip32_derivations[pub].derivation)
mypub = hdkey.key.get_public_key()
if mypub != pub:
raise ValueError(
"Derivation path doesn't look right")
# now check if provided scriptpubkey matches
sc = script.p2wpkh(mypub)
if sc == tx.tx.vout[i].script_pubkey:
is_change = True
if sc.data == tx.tx.vout[i].script_pubkey.data:
is_change = True
if is_change:
change += tx.tx.vout[i].value
print("Change %d sats" % tx.tx.vout[i].value)
else:
spend += tx.tx.vout[i].value
print(
"Spending %d sats to %s" %
(tx.tx.vout[i].value, tx.tx.vout[i].script_pubkey.address(
NETWORKS[currentnetwork])))
destinationaddress = tx.tx.vout[i].script_pubkey.address(
NETWORKS[currentnetwork])
dest_addr_cnt += 1
fee = inp_amount - change - spend
return (change, fee, spend, destinationaddress, outs, dest_addr_cnt)
def __parseOutputs(self):
self.spend_amount = 0
self.change_amount = 0
self.fee_amount = 0
self.destination_addresses = []
self.self_addresses = []
for i, out in enumerate(self.psbt.outputs):
out_policy = PSBTParser.__get_policy(
out, self.psbt.tx.vout[i].script_pubkey, self.psbt.xpubs)
is_change = False
# if policy is the same - probably change
if out_policy == self.policy:
# double-check that it's change
# we already checked in get_cosigners and parse_multisig
# that pubkeys are generated from cosigners,
# and witness script is corresponding multisig
# so we only need to check that scriptpubkey is generated from
# witness script
# empty script by default
sc = script.Script(b"")
# multisig, we know witness script
if self.policy["type"] == "p2wsh":
sc = script.p2wsh(out.witness_script)
elif self.policy["type"] == "p2sh-p2wsh":
sc = script.p2sh(script.p2wsh(out.witness_script))
# single-sig
elif "pkh" in self.policy["type"]:
my_pubkey = None
# should be one or zero for single-key addresses
if len(out.bip32_derivations.values()) > 0:
der = list(
out.bip32_derivations.values())[0].derivation
my_pubkey = self.root.derive(der)
if self.policy[
"type"] == "p2wpkh" and my_pubkey is not None:
sc = script.p2wpkh(my_pubkey)
elif self.policy[
"type"] == "p2sh-p2wpkh" and my_pubkey is not None:
sc = script.p2sh(script.p2wpkh(my_pubkey))
if sc.data == self.psbt.tx.vout[i].script_pubkey.data:
is_change = True
if sc.data == self.psbt.tx.vout[i].script_pubkey.data:
is_change = True
if is_change:
self.change_amount += self.psbt.tx.vout[i].value
self.self_addresses.append(
self.psbt.tx.vout[i].script_pubkey.address(
NETWORKS[self.network]))
else:
self.spend_amount += self.psbt.tx.vout[i].value
self.destination_addresses.append(
self.psbt.tx.vout[i].script_pubkey.address(
NETWORKS[self.network]))
self.fee_amount = self.psbt.fee()
return True
def main():
# mnemonic we use
mnemonic = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about"
seed = bip39.mnemonic_to_seed(mnemonic)
root = bip32.HDKey.from_seed(seed)
# A few transactions
b64psbts = [
# p2wsh, 2 inputs
"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",
# p2sh-p2wsh
"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",
# p2wpkh
"cHNidP8BAHECAAAAAc88WMMpgq4gUIjZvUnrmwKs3009rnalFsazBrFd46FOAAAAAAD9////Anw/XQUAAAAAFgAULzSqHPAKU7BVopGgOn1F8KaYi1KAlpgAAAAAABYAFOZq/v/Dg45x8KJ7B+OwDt5q6OFgAAAAAAABAR8A4fUFAAAAABYAFNDEo+8J6Ze26Z45flGP4+QaEYyhIgYC56slN7XUnpcDCargbp5J82zhyf671E7I4NHMoLT5wxkYc8XaClQAAIABAACAAAAAgAAAAAAAAAAAACICA11J7M1U0AmeQ2did8em1GJdYR2oil30m/lReneRp3elGHPF2gpUAACAAQAAgAAAAIABAAAAAAAAAAAA",
# p2sh-p2wpkh
"cHNidP8BAHICAAAAAXbva/K90EDzwdg6zLl0OfGrsaVWrR0PUpaB/6foypSKAQAAAAD9////Apw9XQUAAAAAF6kUJR3RFFeiWcO6R+XMo3F/5CFOApiHgJaYAAAAAAAWABTmav7/w4OOcfCiewfjsA7eaujhYAAAAAAAAQEgAOH1BQAAAAAXqRQzbKoT4IuWCAoytdgY1ZtKs7NnQocBBBYAFDiXH3OTD2wUHZd6xP1KcnyFSTWzIgYDoa+ASsEIqKUXghmMLQNLKL+QyIA/WlP3Ynb6aaTq538Yc8XaCjEAAIABAACAAAAAgAAAAAAAAAAAAAEAFgAUcL6x4EpQCUDp86uqZuGkmsVbjzUiAgKi/ImWxSYiSLXa78Wk0M3NAMEwR9DLEwKBNupjDYdahxhzxdoKMQAAgAEAAIAAAACAAQAAAAAAAAAAAA==",
]
for i, b64psbt in enumerate(b64psbts):
print("\nTransaction #%d" % (i + 1))
raw = a2b_base64(b64psbt)
tx = psbt.PSBT.parse(raw)
# Check inputs of the transaction and check that they use the same script type
# For multisig parsed policy will look like this:
# { script_type: p2wsh, cosigners: [xpubs strings], m: 2, n: 3}
policy = None
inp_amount = 0
for inp in tx.inputs:
inp_amount += inp.witness_utxo.value
# get policy of the input
inp_policy = get_policy(inp, inp.witness_utxo.script_pubkey,
tx.xpubs)
# if policy is None - assign current
if policy is None:
policy = inp_policy
# otherwise check that everything in the policy is the same
else:
# check policy is the same
if policy != inp_policy:
raise RuntimeError("Mixed inputs in the transaction")
wallet = "Native Segwit "
if "p2sh-" in policy["type"]:
wallet = "Nested Segwit "
if "m" in policy:
wallet += "Multisig (%d of %d)" % (policy["m"], policy["n"])
else:
wallet += "Single sig"
print("Spending from: %s" % wallet)
print("Input amount: %d sat" % inp_amount)
# now go through outputs and check if they are change
spending = 0
change = 0
for i, out in enumerate(tx.outputs):
out_policy = get_policy(out, tx.tx.vout[i].script_pubkey, tx.xpubs)
is_change = False
# if policy is the same - probably change
if out_policy == policy:
# double-check that it's change
# we already checked in get_cosigners and parse_multisig
# that pubkeys are generated from cosigners,
# and witness script is corresponding multisig
# so we only need to check that scriptpubkey is generated from
# witness script
# empty script by default
sc = script.Script(b"")
# multisig, we know witness script
if policy["type"] == "p2wsh":
sc = script.p2wsh(out.witness_script)
elif policy["type"] == "p2sh-p2wsh":
sc = script.p2sh(script.p2wsh(out.witness_script))
# single-sig
elif "pkh" in policy["type"]:
if len(out.bip32_derivations.values()) > 0:
der = list(
out.bip32_derivations.values())[0].derivation
my_pubkey = root.derive(der)
if policy["type"] == "p2wpkh":
sc = script.p2wpkh(my_pubkey)
elif policy["type"] == "p2sh-p2wpkh":
sc = script.p2sh(script.p2wpkh(my_pubkey))
if sc.data == tx.tx.vout[i].script_pubkey.data:
is_change = True
if is_change:
change += tx.tx.vout[i].value
print("Change %d sats" % tx.tx.vout[i].value)
else:
spending += tx.tx.vout[i].value
print("Spending %d sats to %s" %
(tx.tx.vout[i].value,
tx.tx.vout[i].script_pubkey.address()))
fee = inp_amount - change - spending
print("Fee: %d sats" % fee)