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248 lines
11 KiB
Python
Executable File
248 lines
11 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2014-present The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Test logic for skipping signature validation on old blocks.
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Test logic for skipping signature validation on blocks which we've assumed
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valid (https://github.com/bitcoin/bitcoin/pull/9484)
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We build a chain that includes an invalid signature for one of the transactions:
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0: genesis block
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1: block 1 with coinbase transaction output.
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2-101: bury that block with 100 blocks so the coinbase transaction
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output can be spent
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102: a block containing a transaction spending the coinbase
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transaction output. The transaction has an invalid signature.
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103-2202: bury the bad block with just over two weeks' worth of blocks
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(2100 blocks)
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Start a few nodes:
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- node0 has no -assumevalid parameter. Try to sync to block 2202. It will
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reject block 102 and only sync as far as block 101
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- node1 has -assumevalid set to the hash of block 102. Try to sync to
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block 2202. node1 will sync all the way to block 2202.
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- node2 has -assumevalid set to the hash of block 102. Try to sync to
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block 200. node2 will reject block 102 since it's assumed valid, but it
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isn't buried by at least two weeks' work.
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- node3 has -assumevalid set to the hash of block 102. Feed a longer
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competing headers-only branch so block #1 is not on the best header chain.
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- node4 has -assumevalid set to the hash of block 102. Submit an alternative
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block #1 that is not part of the assumevalid chain.
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- node5 starts with no -assumevalid parameter. Reindex to hit
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"assumevalid hash not in headers" and "below minimum chainwork".
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"""
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from test_framework.blocktools import (
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COINBASE_MATURITY,
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create_block,
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create_coinbase,
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)
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from test_framework.messages import (
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CBlockHeader,
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COutPoint,
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CTransaction,
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CTxIn,
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CTxOut,
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msg_block,
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msg_headers,
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)
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from test_framework.p2p import P2PInterface
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from test_framework.script import (
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CScript,
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OP_TRUE,
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)
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import assert_equal
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from test_framework.wallet_util import generate_keypair
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class BaseNode(P2PInterface):
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def send_header_for_blocks(self, new_blocks):
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headers_message = msg_headers()
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headers_message.headers = [CBlockHeader(b) for b in new_blocks]
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self.send_without_ping(headers_message)
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class AssumeValidTest(BitcoinTestFramework):
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def set_test_params(self):
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self.setup_clean_chain = True
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self.num_nodes = 6
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self.rpc_timeout = 120
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def setup_network(self):
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self.add_nodes(self.num_nodes)
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# Start node0. We don't start the other nodes yet since
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# we need to pre-mine a block with an invalid transaction
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# signature so we can pass in the block hash as assumevalid.
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self.start_node(0)
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def run_test(self):
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# Build the blockchain
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self.tip = int(self.nodes[0].getbestblockhash(), 16)
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self.block_time = self.nodes[0].getblock(self.nodes[0].getbestblockhash())['time'] + 1
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self.blocks = []
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# Get a pubkey for the coinbase TXO
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_, coinbase_pubkey = generate_keypair()
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# Create the first block with a coinbase output to our key
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height = 1
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block = create_block(self.tip, create_coinbase(height, coinbase_pubkey), self.block_time)
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self.blocks.append(block)
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self.block_time += 1
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block.solve()
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# Save the coinbase for later
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self.block1 = block
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self.tip = block.hash_int
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height += 1
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# Bury the block 100 deep so the coinbase output is spendable
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for _ in range(100):
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block = create_block(self.tip, create_coinbase(height), self.block_time)
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block.solve()
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self.blocks.append(block)
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self.tip = block.hash_int
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self.block_time += 1
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height += 1
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# Create a transaction spending the coinbase output with an invalid (null) signature
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tx = CTransaction()
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tx.vin.append(CTxIn(COutPoint(self.block1.vtx[0].txid_int, 0), scriptSig=b""))
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tx.vout.append(CTxOut(49 * 100000000, CScript([OP_TRUE])))
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block102 = create_block(self.tip, create_coinbase(height), self.block_time, txlist=[tx])
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self.block_time += 1
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block102.solve()
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self.blocks.append(block102)
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self.tip = block102.hash_int
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self.block_time += 1
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height += 1
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# Bury the assumed valid block 2100 deep
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for _ in range(2100):
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block = create_block(self.tip, create_coinbase(height), self.block_time)
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block.solve()
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self.blocks.append(block)
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self.tip = block.hash_int
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self.block_time += 1
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height += 1
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block_1_hash = self.blocks[0].hash_hex
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self.start_node(1, extra_args=[f"-assumevalid={block102.hash_hex}"])
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self.start_node(2, extra_args=[f"-assumevalid={block102.hash_hex}"])
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self.start_node(3, extra_args=[f"-assumevalid={block102.hash_hex}"])
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self.start_node(4, extra_args=[f"-assumevalid={block102.hash_hex}"])
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self.start_node(5)
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# nodes[0]
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self.log.info("Send blocks to node0. Block 102 will be rejected.")
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p2p0 = self.nodes[0].add_p2p_connection(BaseNode())
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p2p0.send_header_for_blocks(self.blocks[0:2000])
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p2p0.send_header_for_blocks(self.blocks[2000:])
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with self.nodes[0].assert_debug_log(expected_msgs=[
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f"Enabling script verification at block #1 ({block_1_hash}): assumevalid=0 (always verify).",
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]):
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p2p0.send_and_ping(msg_block(self.blocks[0]))
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with self.nodes[0].assert_debug_log(expected_msgs=[
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"Block validation error: block-script-verify-flag-failed",
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]):
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for i in range(1, 103):
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p2p0.send_without_ping(msg_block(self.blocks[i]))
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p2p0.wait_for_disconnect()
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assert_equal(self.nodes[0].getblockcount(), COINBASE_MATURITY + 1)
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assert_equal(next(filter(lambda x: x["hash"] == self.blocks[-1].hash_hex, self.nodes[0].getchaintips()))["status"], "invalid")
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# nodes[1]
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self.log.info("Send all blocks to node1. All blocks will be accepted.")
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p2p1 = self.nodes[1].add_p2p_connection(BaseNode())
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p2p1.send_header_for_blocks(self.blocks[0:2000])
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p2p1.send_header_for_blocks(self.blocks[2000:])
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with self.nodes[1].assert_debug_log(expected_msgs=[
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f"Disabling script verification at block #1 ({self.blocks[0].hash_hex}).",
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]):
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p2p1.send_and_ping(msg_block(self.blocks[0]))
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with self.nodes[1].assert_debug_log(expected_msgs=[
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f"Enabling script verification at block #103 ({self.blocks[102].hash_hex}): block height above assumevalid height.",
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]):
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for i in range(1, 2202):
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p2p1.send_without_ping(msg_block(self.blocks[i]))
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# Syncing 2200 blocks can take a while on slow systems. Give it plenty of time to sync.
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p2p1.sync_with_ping(timeout=960)
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assert_equal(self.nodes[1].getblockcount(), 2202)
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# nodes[2]
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self.log.info("Send blocks to node2. Block 102 will be rejected.")
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p2p2 = self.nodes[2].add_p2p_connection(BaseNode())
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p2p2.send_header_for_blocks(self.blocks[0:200])
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with self.nodes[2].assert_debug_log(expected_msgs=[
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f"Enabling script verification at block #1 ({block_1_hash}): block too recent relative to best header.",
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]):
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p2p2.send_and_ping(msg_block(self.blocks[0]))
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with self.nodes[2].assert_debug_log(expected_msgs=[
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"Block validation error: block-script-verify-flag-failed",
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]):
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for i in range(1, 103):
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p2p2.send_without_ping(msg_block(self.blocks[i]))
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p2p2.wait_for_disconnect()
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assert_equal(self.nodes[2].getblockcount(), COINBASE_MATURITY + 1)
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assert_equal(next(filter(lambda x: x["hash"] == self.blocks[199].hash_hex, self.nodes[2].getchaintips()))["status"], "invalid")
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# nodes[3]
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self.log.info("Send two header chains, and a block not in the best header chain to node3.")
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best_hash = self.nodes[3].getbestblockhash()
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tip_block = self.nodes[3].getblock(best_hash)
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second_chain_tip, second_chain_time, second_chain_height = int(best_hash, 16), tip_block["time"] + 1, tip_block["height"] + 1
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second_chain = []
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for _ in range(150):
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block = create_block(second_chain_tip, create_coinbase(second_chain_height), second_chain_time)
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block.solve()
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second_chain.append(block)
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second_chain_tip, second_chain_time, second_chain_height = block.hash_int, second_chain_time + 1, second_chain_height + 1
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p2p3 = self.nodes[3].add_p2p_connection(BaseNode())
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p2p3.send_header_for_blocks(second_chain)
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p2p3.send_header_for_blocks(self.blocks[0:103])
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with self.nodes[3].assert_debug_log(expected_msgs=[
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f"Enabling script verification at block #1 ({block_1_hash}): block not in best header chain.",
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]):
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p2p3.send_and_ping(msg_block(self.blocks[0]))
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assert_equal(self.nodes[3].getblockcount(), 1)
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# nodes[4]
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self.log.info("Send a block not in the assumevalid header chain to node4.")
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genesis_hash = self.nodes[4].getbestblockhash()
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genesis_time = self.nodes[4].getblock(genesis_hash)['time']
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alt1 = create_block(int(genesis_hash, 16), create_coinbase(1), genesis_time + 2)
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alt1.solve()
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p2p4 = self.nodes[4].add_p2p_connection(BaseNode())
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p2p4.send_header_for_blocks(self.blocks[0:103])
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with self.nodes[4].assert_debug_log(expected_msgs=[
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f"Enabling script verification at block #1 ({alt1.hash_hex}): block not in assumevalid chain.",
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]):
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p2p4.send_and_ping(msg_block(alt1))
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assert_equal(self.nodes[4].getblockcount(), 1)
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# nodes[5]
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self.log.info("Reindex to hit specific assumevalid gates (no races with header downloads/chainwork during startup).")
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p2p5 = self.nodes[5].add_p2p_connection(BaseNode())
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p2p5.send_header_for_blocks(self.blocks[0:200])
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p2p5.send_without_ping(msg_block(self.blocks[0]))
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self.wait_until(lambda: self.nodes[5].getblockcount() == 1)
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with self.nodes[5].assert_debug_log(expected_msgs=[
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f"Enabling script verification at block #1 ({block_1_hash}): assumevalid hash not in headers.",
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]):
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self.restart_node(5, extra_args=["-reindex-chainstate", "-assumevalid=1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"])
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assert_equal(self.nodes[5].getblockcount(), 1)
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with self.nodes[5].assert_debug_log(expected_msgs=[
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f"Enabling script verification at block #1 ({block_1_hash}): best header chainwork below minimumchainwork.",
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]):
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self.restart_node(5, extra_args=["-reindex-chainstate", f"-assumevalid={block102.hash_hex}", "-minimumchainwork=0xffff"])
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assert_equal(self.nodes[5].getblockcount(), 1)
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if __name__ == '__main__':
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AssumeValidTest(__file__).main()
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