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wallet_multisig_descriptor_psbt.py
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#!/usr/bin/env python3
# Copyright (c) 2021-2022 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test a basic M-of-N multisig setup between multiple people using descriptor wallets and PSBTs, as well as a signing flow.
This is meant to be documentation as much as functional tests, so it is kept as simple and readable as possible.
"""
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_approx,
assert_equal,
)
class WalletMultisigDescriptorPSBTTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 3
self.setup_clean_chain = True
self.wallet_names = []
self.extra_args = [["-keypool=100"]] * self.num_nodes
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
@staticmethod
def _get_xpub(wallet, internal):
"""Extract the wallet's xpubs using `listdescriptors` and pick the one from the `pkh` descriptor since it's least likely to be accidentally reused (legacy addresses)."""
pkh_descriptor = next(filter(lambda d: d["desc"].startswith("pkh(") and d["internal"] == internal, wallet.listdescriptors()["descriptors"]))
# Keep all key origin information (master key fingerprint and all derivation steps) for proper support of hardware devices
# See section 'Key origin identification' in 'doc/descriptors.md' for more details...
return pkh_descriptor["desc"].split("pkh(")[1].split(")")[0]
@staticmethod
def _check_psbt(psbt, to, value, multisig):
"""Helper function for any of the N participants to check the psbt with decodepsbt and verify it is OK before signing."""
tx = multisig.decodepsbt(psbt)["tx"]
amount = 0
for vout in tx["vout"]:
address = vout["scriptPubKey"]["address"]
assert_equal(multisig.getaddressinfo(address)["ischange"], address != to)
if address == to:
amount += vout["value"]
assert_approx(amount, float(value), vspan=0.001)
def participants_create_multisigs(self, external_xpubs, internal_xpubs):
"""The multisig is created by importing the following descriptors. The resulting wallet is watch-only and every participant can do this."""
for i, node in enumerate(self.nodes):
node.createwallet(wallet_name=f"{self.name}_{i}", blank=True, descriptors=True, disable_private_keys=True)
multisig = node.get_wallet_rpc(f"{self.name}_{i}")
external = multisig.getdescriptorinfo(f"wsh(sortedmulti({self.M},{','.join(external_xpubs)}))")
internal = multisig.getdescriptorinfo(f"wsh(sortedmulti({self.M},{','.join(internal_xpubs)}))")
result = multisig.importdescriptors([
{ # receiving addresses (internal: False)
"desc": external["descriptor"],
"active": True,
"internal": False,
"timestamp": "now",
},
{ # change addresses (internal: True)
"desc": internal["descriptor"],
"active": True,
"internal": True,
"timestamp": "now",
},
])
assert all(r["success"] for r in result)
yield multisig
def run_test(self):
self.M = 2
self.N = self.num_nodes
self.name = f"{self.M}_of_{self.N}_multisig"
self.log.info(f"Testing {self.name}...")
participants = {
# Every participant generates an xpub. The most straightforward way is to create a new descriptor wallet.
# This wallet will be the participant's `signer` for the resulting multisig. Avoid reusing this wallet for any other purpose (for privacy reasons).
"signers": [node.get_wallet_rpc(node.createwallet(wallet_name=f"participant_{self.nodes.index(node)}", descriptors=True)["name"]) for node in self.nodes],
# After participants generate and exchange their xpubs they will each create their own watch-only multisig.
# Note: these multisigs are all the same, this just highlights that each participant can independently verify everything on their own node.
"multisigs": []
}
self.log.info("Generate and exchange xpubs...")
external_xpubs, internal_xpubs = [[self._get_xpub(signer, internal) for signer in participants["signers"]] for internal in [False, True]]
self.log.info("Every participant imports the following descriptors to create the watch-only multisig...")
participants["multisigs"] = list(self.participants_create_multisigs(external_xpubs, internal_xpubs))
self.log.info("Check that every participant's multisig generates the same addresses...")
for _ in range(10): # we check that the first 10 generated addresses are the same for all participant's multisigs
receive_addresses = [multisig.getnewaddress() for multisig in participants["multisigs"]]
assert all(address == receive_addresses[0] for address in receive_addresses)
change_addresses = [multisig.getrawchangeaddress() for multisig in participants["multisigs"]]
assert all(address == change_addresses[0] for address in change_addresses)
self.log.info("Get a mature utxo to send to the multisig...")
coordinator_wallet = participants["signers"][0]
self.generatetoaddress(self.nodes[0], 101, coordinator_wallet.getnewaddress())
deposit_amount = 6.15
multisig_receiving_address = participants["multisigs"][0].getnewaddress()
self.log.info("Send funds to the resulting multisig receiving address...")
coordinator_wallet.sendtoaddress(multisig_receiving_address, deposit_amount)
self.generate(self.nodes[0], 1)
for participant in participants["multisigs"]:
assert_approx(participant.getbalance(), deposit_amount, vspan=0.001)
self.log.info("Send a transaction from the multisig!")
to = participants["signers"][self.N - 1].getnewaddress()
value = 1
self.log.info("First, make a sending transaction, created using `walletcreatefundedpsbt` (anyone can initiate this)...")
psbt = participants["multisigs"][0].walletcreatefundedpsbt(inputs=[], outputs={to: value}, feeRate=0.00010)
psbts = []
self.log.info("Now at least M users check the psbt with decodepsbt and (if OK) signs it with walletprocesspsbt...")
for m in range(self.M):
signers_multisig = participants["multisigs"][m]
self._check_psbt(psbt["psbt"], to, value, signers_multisig)
signing_wallet = participants["signers"][m]
partially_signed_psbt = signing_wallet.walletprocesspsbt(psbt["psbt"])
psbts.append(partially_signed_psbt["psbt"])
self.log.info("Finally, collect the signed PSBTs with combinepsbt, finalizepsbt, then broadcast the resulting transaction...")
combined = coordinator_wallet.combinepsbt(psbts)
finalized = coordinator_wallet.finalizepsbt(combined)
coordinator_wallet.sendrawtransaction(finalized["hex"])
self.log.info("Check that balances are correct after the transaction has been included in a block.")
self.generate(self.nodes[0], 1)
assert_approx(participants["multisigs"][0].getbalance(), deposit_amount - value, vspan=0.001)
assert_equal(participants["signers"][self.N - 1].getbalance(), value)
self.log.info("Send another transaction from the multisig, this time with a daisy chained signing flow (one after another in series)!")
psbt = participants["multisigs"][0].walletcreatefundedpsbt(inputs=[], outputs={to: value}, feeRate=0.00010)
for m in range(self.M):
signers_multisig = participants["multisigs"][m]
self._check_psbt(psbt["psbt"], to, value, signers_multisig)
signing_wallet = participants["signers"][m]
psbt = signing_wallet.walletprocesspsbt(psbt["psbt"])
assert_equal(psbt["complete"], m == self.M - 1)
coordinator_wallet.sendrawtransaction(psbt["hex"])
self.log.info("Check that balances are correct after the transaction has been included in a block.")
self.generate(self.nodes[0], 1)
assert_approx(participants["multisigs"][0].getbalance(), deposit_amount - (value * 2), vspan=0.001)
assert_equal(participants["signers"][self.N - 1].getbalance(), value * 2)
if __name__ == "__main__":
WalletMultisigDescriptorPSBTTest(__file__).main()