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#!/usr/bin/env python3
# Copyright (c) 2020-2021 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 UTXO set hash value calculation in gettxoutsetinfo."""
import struct
from test_framework.blocktools import create_transaction
from test_framework.messages import (
CBlock,
COutPoint,
FromHex,
)
from test_framework.muhash import MuHash3072
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import assert_equal
class UTXOSetHashTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.setup_clean_chain = True
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
def test_deterministic_hash_results(self):
self.log.info("Test deterministic UTXO set hash results")
# These depend on the setup_clean_chain option, the chain loaded from the cache
assert_equal(self.nodes[0].gettxoutsetinfo()['hash_serialized_2'], "b32ec1dda5a53cd025b95387aad344a801825fe46a60ff952ce26528f01d3be8")
assert_equal(self.nodes[0].gettxoutsetinfo("muhash")['muhash'], "dd5ad2a105c2d29495f577245c357409002329b9f4d6182c0af3dc2f462555c8")
def test_muhash_implementation(self):
self.log.info("Test MuHash implementation consistency")
node = self.nodes[0]
# Generate 100 blocks and remove the first since we plan to spend its
# coinbase
block_hashes = node.generate(100)
blocks = list(map(lambda block: FromHex(CBlock(), node.getblock(block, False)), block_hashes))
spending = blocks.pop(0)
# Create a spending transaction and mine a block which includes it
tx = create_transaction(node, spending.vtx[0].rehash(), node.getnewaddress(), amount=49)
txid = node.sendrawtransaction(hexstring=tx.serialize_with_witness().hex(), maxfeerate=0)
tx_block = node.generateblock(output=node.getnewaddress(), transactions=[txid])
blocks.append(FromHex(CBlock(), node.getblock(tx_block['hash'], False)))
# Serialize the outputs that should be in the UTXO set and add them to
# a MuHash object
muhash = MuHash3072()
for height, block in enumerate(blocks):
# The Genesis block coinbase is not part of the UTXO set and we
# spent the first mined block
height += 2
for tx in block.vtx:
for n, tx_out in enumerate(tx.vout):
coinbase = 1 if not tx.vin[0].prevout.hash else 0
# Skip witness commitment
if (coinbase and n > 0):
continue
data = COutPoint(int(tx.rehash(), 16), n).serialize()
data += struct.pack("<i", height * 2 + coinbase)
data += tx_out.serialize()
muhash.insert(data)
finalized = muhash.digest()
node_muhash = node.gettxoutsetinfo("muhash")['muhash']
assert_equal(finalized[::-1].hex(), node_muhash)
def run_test(self):
self.test_deterministic_hash_results()
self.test_muhash_implementation()
if __name__ == '__main__':
UTXOSetHashTest().main()
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