#!/usr/bin/env python3 # Copyright (c) 2014-2019 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 gettxoutproof and verifytxoutproof RPCs.""" from test_framework.blocktools import COINBASE_MATURITY from test_framework.messages import ( CMerkleBlock, from_hex, ) from test_framework.test_framework import BitcoinTestFramework from test_framework.wallet import MiniWallet from test_framework.util import ( assert_equal, assert_raises_rpc_error, ) class MerkleBlockTest(BitcoinTestFramework): def set_test_params(self): self.num_nodes = 2 self.setup_clean_chain = True # Nodes 0/1 are "wallet" nodes, Nodes 2/3 are used for testing self.extra_args = [ [], ["-txindex"], ] def run_test(self): miniwallet = MiniWallet(self.nodes[0]) # Add enough mature utxos to the wallet, so that all txs spend confirmed coins miniwallet.generate(5) self.nodes[0].generate(COINBASE_MATURITY) self.sync_all() chain_height = self.nodes[1].getblockcount() assert_equal(chain_height, 5 + COINBASE_MATURITY) txid1 = miniwallet.send_self_transfer(from_node=self.nodes[0])['txid'] txid2 = miniwallet.send_self_transfer(from_node=self.nodes[0])['txid'] # This will raise an exception because the transaction is not yet in a block assert_raises_rpc_error(-5, "Transaction not yet in block", self.nodes[0].gettxoutproof, [txid1]) self.nodes[0].generate(1) blockhash = self.nodes[0].getblockhash(chain_height + 1) self.sync_all() txlist = [] blocktxn = self.nodes[0].getblock(blockhash, True)["tx"] txlist.append(blocktxn[1]) txlist.append(blocktxn[2]) assert_equal(self.nodes[0].verifytxoutproof(self.nodes[0].gettxoutproof([txid1])), [txid1]) assert_equal(self.nodes[0].verifytxoutproof(self.nodes[0].gettxoutproof([txid1, txid2])), txlist) assert_equal(self.nodes[0].verifytxoutproof(self.nodes[0].gettxoutproof([txid1, txid2], blockhash)), txlist) txin_spent = miniwallet.get_utxo() # Get the change from txid2 tx3 = miniwallet.send_self_transfer(from_node=self.nodes[0], utxo_to_spend=txin_spent) txid3 = tx3['txid'] self.nodes[0].generate(1) self.sync_all() txid_spent = txin_spent["txid"] txid_unspent = txid1 # Input was change from txid2, so txid1 should be unspent # Invalid txids assert_raises_rpc_error(-8, "txid must be of length 64 (not 32, for '00000000000000000000000000000000')", self.nodes[0].gettxoutproof, ["00000000000000000000000000000000"], blockhash) assert_raises_rpc_error(-8, "txid must be hexadecimal string (not 'ZZZ0000000000000000000000000000000000000000000000000000000000000')", self.nodes[0].gettxoutproof, ["ZZZ0000000000000000000000000000000000000000000000000000000000000"], blockhash) # Invalid blockhashes assert_raises_rpc_error(-8, "blockhash must be of length 64 (not 32, for '00000000000000000000000000000000')", self.nodes[0].gettxoutproof, [txid_spent], "00000000000000000000000000000000") assert_raises_rpc_error(-8, "blockhash must be hexadecimal string (not 'ZZZ0000000000000000000000000000000000000000000000000000000000000')", self.nodes[0].gettxoutproof, [txid_spent], "ZZZ0000000000000000000000000000000000000000000000000000000000000") # We can't find the block from a fully-spent tx # Doesn't apply to Dash Core - we have txindex always on # assert_raises_rpc_error(-5, "Transaction not yet in block", self.nodes[2].gettxoutproof, [txid_spent]) # We can get the proof if we specify the block assert_equal(self.nodes[0].verifytxoutproof(self.nodes[0].gettxoutproof([txid_spent], blockhash)), [txid_spent]) # We can't get the proof if we specify a non-existent block assert_raises_rpc_error(-5, "Block not found", self.nodes[0].gettxoutproof, [txid_spent], "0000000000000000000000000000000000000000000000000000000000000000") # We can get the proof if the transaction is unspent assert_equal(self.nodes[0].verifytxoutproof(self.nodes[0].gettxoutproof([txid_unspent])), [txid_unspent]) # We can get the proof if we provide a list of transactions and one of them is unspent. The ordering of the list should not matter. assert_equal(sorted(self.nodes[0].verifytxoutproof(self.nodes[0].gettxoutproof([txid1, txid2]))), sorted(txlist)) assert_equal(sorted(self.nodes[0].verifytxoutproof(self.nodes[0].gettxoutproof([txid2, txid1]))), sorted(txlist)) # We can always get a proof if we have a -txindex assert_equal(self.nodes[0].verifytxoutproof(self.nodes[1].gettxoutproof([txid_spent])), [txid_spent]) # We can't get a proof if we specify transactions from different blocks assert_raises_rpc_error(-5, "Not all transactions found in specified or retrieved block", self.nodes[0].gettxoutproof, [txid1, txid3]) # Test empty list assert_raises_rpc_error(-8, "Parameter 'txids' cannot be empty", self.nodes[0].gettxoutproof, []) # Test duplicate txid assert_raises_rpc_error(-8, 'Invalid parameter, duplicated txid', self.nodes[0].gettxoutproof, [txid1, txid1]) # Now we'll try tweaking a proof. proof = self.nodes[1].gettxoutproof([txid1, txid2]) assert txid1 in self.nodes[0].verifytxoutproof(proof) assert txid2 in self.nodes[1].verifytxoutproof(proof) tweaked_proof = from_hex(CMerkleBlock(), proof) # Make sure that our serialization/deserialization is working assert txid1 in self.nodes[0].verifytxoutproof(tweaked_proof.serialize().hex()) # Check to see if we can go up the merkle tree and pass this off as a # single-transaction block tweaked_proof.txn.nTransactions = 1 tweaked_proof.txn.vHash = [tweaked_proof.header.hashMerkleRoot] tweaked_proof.txn.vBits = [True] + [False]*7 for n in self.nodes: assert not n.verifytxoutproof(tweaked_proof.serialize().hex()) # TODO: try more variants, eg transactions at different depths, and # verify that the proofs are invalid if __name__ == '__main__': MerkleBlockTest().main()