def mine_large_blocks(node, n):
# Make a large scriptPubKey for the coinbase transaction. This is OP_RETURN
# followed by 950k of OP_NOP. This would be non-standard in a non-coinbase
# transaction but is consensus valid.
# Set the nTime if this is the first time this function has been called.
# A static variable ensures that time is monotonicly increasing and is therefore
# different for each block created => blockhash is unique.
if "nTimes" not in mine_large_blocks.__dict__:
mine_large_blocks.nTime = 0
# Get the block parameters for the first block
big_script = CScript([OP_RETURN] + [OP_NOP] * 950000)
best_block = node.getblock(node.getbestblockhash())
height = int(best_block["height"]) + 1
mine_large_blocks.nTime = max(mine_large_blocks.nTime,
int(best_block["time"])) + 1
previousblockhash = int(best_block["hash"], 16)
for _ in range(n):
# Build the coinbase transaction (with large scriptPubKey)
coinbase_tx = create_coinbase(height)
coinbase_tx.vin[0].nSequence = 2**32 - 1
coinbase_tx.vout[0].scriptPubKey = big_script
coinbase_tx.rehash()
# Build the block
block = CBlock()
block.nHeaderVersion = best_block["version"]
block.hashPrevBlock = previousblockhash
block.nTime = mine_large_blocks.nTime
block.nBits = int('207fffff', 16)
block.nNonce = 0
block.vtx = [coinbase_tx]
block.hashMerkleRoot = block.calc_merkle_root()
block.solve()
# Submit to the node
node.submitblock(ToHex(block))
previousblockhash = block.sha256
height += 1
mine_large_blocks.nTime += 1
def run_test(self):
node = self.nodes[0]
node.add_p2p_connection(P2PDataStore())
# OP_TRUE in P2SH
address = node.decodescript('51')['p2sh']
# burn script
p2sh_script = CScript([OP_HASH160, bytes(20), OP_EQUAL])
prevblockhash = node.getbestblockhash()
coinbase = create_coinbase(201)
coinbase.vout[1].scriptPubKey = p2sh_script
coinbase.rehash()
sample_block = CBlock()
sample_block.vtx = [coinbase]
sample_block.hashPrevBlock = int(prevblockhash, 16)
sample_block.nBits = 0x207fffff
sample_block.nTime = 1600000036
sample_block.nReserved = 0
sample_block.nHeaderVersion = 1
sample_block.nHeight = 201
sample_block.hashEpochBlock = 0
sample_block.hashMerkleRoot = sample_block.calc_merkle_root()
sample_block.hashExtendedMetadata = hash256_int(b'\0')
sample_block.update_size()
# Using legacy hashing algo
block = copy.deepcopy(sample_block)
target = uint256_from_compact(block.nBits)
block.rehash()
while hash256_int(
block.serialize()) > target or block.sha256 <= target:
block.nNonce += 1
block.rehash()
self.fail_block(block, force_send=True, reject_reason='high-hash')
del block
# Claimed size already excessive (before doing any other checks)
block = copy.deepcopy(sample_block)
block.nSize = 32_000_001
block.solve()
self.fail_block(block, force_send=True, reject_reason='bad-blk-size')
del block
# Incorrect nBits
block = copy.deepcopy(sample_block)
block.nBits = 0x207ffffe
block.solve()
self.fail_block(block, force_send=True, reject_reason='bad-diffbits')
del block
# Block too old
block = copy.deepcopy(sample_block)
block.nTime = 1600000035
block.solve()
self.fail_block(block, force_send=True, reject_reason='time-too-old')
del block
# nReserved must be 0
block = copy.deepcopy(sample_block)
block.nReserved = 0x0100
block.solve()
self.fail_block(block,
force_send=True,
reject_reason='bad-blk-reserved')
del block
# nHeaderVersion must be 1
block = copy.deepcopy(sample_block)
block.nHeaderVersion = 0
block.solve()
self.fail_block(block,
force_send=True,
reject_reason='bad-blk-version')
block.nHeaderVersion = 2
block.solve()
self.fail_block(block,
force_send=True,
reject_reason='bad-blk-version')
del block
# Incorrect claimed height
block = copy.deepcopy(sample_block)
block.nHeight = 200
block.solve()
self.fail_block(block, force_send=True, reject_reason='bad-blk-height')
block.nHeight = 202
block.solve()
self.fail_block(block, force_send=True, reject_reason='bad-blk-height')
del block
# Invalid epoch block
block = copy.deepcopy(sample_block)
block.hashEpochBlock = 1
block.solve()
self.fail_block(block, force_send=True, reject_reason='bad-blk-epoch')
del block
# Time too far into the future
block = copy.deepcopy(sample_block)
block.nTime = int(time.time()) + 2 * 60 * 60 + 1
block.solve()
self.fail_block(block, force_send=True, reject_reason='time-too-new')
del block
# Invalid merkle root
block = copy.deepcopy(sample_block)
block.hashMerkleRoot = 0
block.solve()
self.fail_block(block, reject_reason='bad-txnmrklroot')
del block
# Invalid metadata hash
block = copy.deepcopy(sample_block)
block.hashExtendedMetadata = 0
block.solve()
self.fail_block(block, reject_reason='bad-metadata-hash')
del block
# Non-empty metadata
block = copy.deepcopy(sample_block)
block.vMetadata.append(CBlockMetadataField(0, b''))
block.rehash_extended_metadata()
block.solve()
self.fail_block(block, reject_reason='bad-metadata')
del block
# Claimed nSize doesn't match actual size
block = copy.deepcopy(sample_block)
block.nSize = 1
block.solve()
self.fail_block(block, reject_reason='blk-size-mismatch')
del block
block_template = node.getblocktemplate()
assert_equal(block_template.pop('capabilities'), ['proposal'])
assert_equal(block_template.pop('version'), 1)
assert_equal(block_template.pop('previousblockhash'), prevblockhash)
assert_equal(
block_template.pop('epochblockhash'),
'0000000000000000000000000000000000000000000000000000000000000000')
assert_equal(
block_template.pop('extendedmetadatahash'),
'9a538906e6466ebd2617d321f71bc94e56056ce213d366773699e28158e00614')
assert_equal(block_template.pop('transactions'), [])
assert_equal(block_template.pop('coinbaseaux'), {})
assert_equal(block_template.pop('coinbasevalue'), int(SUBSIDY * COIN))
assert_equal(block_template.pop('coinbasetxn'),
{'minerfund': {
'outputs': []
}})
block_template.pop('longpollid')
assert_equal(
block_template.pop('target'),
'7fffff0000000000000000000000000000000000000000000000000000000000')
assert_equal(block_template.pop('mintime'), 1600000036)
assert_equal(block_template.pop('mutable'),
['time', 'transactions', 'prevblock'])
assert_equal(block_template.pop('noncerange'), '00000000ffffffff')
assert_equal(block_template.pop('sigoplimit'), 226950)
assert_equal(block_template.pop('sizelimit'), 32000000)
block_template.pop('curtime')
assert_equal(block_template.pop('bits'), '207fffff')
assert_equal(block_template.pop('height'), 201)
assert_equal(block_template, {})
# Check epoch hash is 0 for the first 20 blocks
for height in range(201, 221):
block_template = node.getblocktemplate()
assert_equal(block_template['epochblockhash'], '00' * 32)
block = self.block_from_template(block_template)
block.hashEpochBlock = 0
prepare_block(block)
node.p2p.send_blocks_and_test([block], node)
del block
# Move to end of epoch
node.generatetoaddress(4819, address)
assert_equal(node.getblockcount(), 5039)
epochblockhash = node.getbestblockhash()
epochblock = node.getblock(epochblockhash)
assert_equal(epochblock['epochblockhash'], '00' * 32)
# getblocktemplate gives us current tip as epoch block hash
block_template = node.getblocktemplate()
assert_equal(block_template['epochblockhash'], epochblockhash)
assert_equal(block_template['previousblockhash'], epochblockhash)
# Using 0 as epoch block hash is now invalid
block = self.block_from_template(block_template)
block.hashEpochBlock = 0
prepare_block(block)
self.fail_block(block, force_send=True, reject_reason='bad-blk-epoch')
# Setting current tip as epoch hash makes the block valid
block.hashEpochBlock = int(epochblockhash, 16)
prepare_block(block)
node.p2p.send_blocks_and_test([block], node)
del block
# getblocktemplate still gives us the same epoch block hash
block_template = node.getblocktemplate()
assert_equal(block_template['epochblockhash'], epochblockhash)
assert_equal(block_template['previousblockhash'],
node.getbestblockhash())
# Block after that still requires epoch block hash
block = self.block_from_template(block_template)
block.hashEpochBlock = int(epochblockhash, 16)
prepare_block(block)
node.p2p.send_blocks_and_test([block], node)
del block
# Test 48-bit nTime
node.setmocktime(
2**32) # smallest number that does not fit in 32-bit number
block_template = node.getblocktemplate()
assert_equal(block_template['curtime'], 2**32)
block = self.block_from_template(block_template)
block.nTime = 2**32
prepare_block(block)
node.p2p.send_blocks_and_test([block], node)
del block
node.setmocktime(2**48 - 1) # biggest possible 48-bit number
block_template = node.getblocktemplate()
assert_equal(block_template['curtime'], 2**48 - 1)
block = self.block_from_template(block_template)
block.nTime = 2**48 - 1
prepare_block(block)
node.p2p.send_blocks_and_test([block], node)
del block
def run_test(self):
self.mine_chain()
node = self.nodes[0]
def assert_submitblock(block, result_str_1, result_str_2=None):
block.solve()
result_str_2 = result_str_2 or 'duplicate-invalid'
assert_equal(result_str_1,
node.submitblock(hexdata=block.serialize().hex()))
assert_equal(result_str_2,
node.submitblock(hexdata=block.serialize().hex()))
self.log.info('getmininginfo')
mining_info = node.getmininginfo()
assert_equal(mining_info['blocks'], 200)
assert_equal(mining_info['chain'], self.chain)
assert 'currentblocktx' not in mining_info
assert 'currentblocksize' not in mining_info
assert_equal(mining_info['difficulty'],
Decimal('4.656542373906925E-10'))
assert_equal(mining_info['networkhashps'],
Decimal('0.003333333333333334'))
assert_equal(mining_info['pooledtx'], 0)
# Mine a block to leave initial block download
node.generatetoaddress(1, node.get_deterministic_priv_key().address)
tmpl = node.getblocktemplate()
self.log.info("getblocktemplate: Test capability advertised")
assert 'proposal' in tmpl['capabilities']
next_height = int(tmpl["height"])
coinbase_tx = create_coinbase(height=next_height)
# sequence numbers must not be max for nLockTime to have effect
coinbase_tx.vin[0].nSequence = 2**32 - 2
coinbase_tx.rehash()
block = CBlock()
block.nHeaderVersion = tmpl["version"]
block.hashPrevBlock = int(tmpl["previousblockhash"], 16)
block.nTime = tmpl["curtime"]
block.nBits = int(tmpl["bits"], 16)
block.nNonce = 0
block.nHeight = next_height
block.vtx = [coinbase_tx]
prepare_block(block)
self.log.info("getblocktemplate: Test valid block")
assert_template(node, block, None)
self.log.info("submitblock: Test block decode failure")
assert_raises_rpc_error(-22, "Block decode failed", node.submitblock,
block.serialize()[:-15].hex())
self.log.info(
"getblocktemplate: Test bad input hash for coinbase transaction")
bad_block = copy.deepcopy(block)
bad_block.vtx[0].vin[0].prevout.hash += 1
bad_block.vtx[0].rehash()
assert_template(node, bad_block, 'bad-cb-missing')
self.log.info("submitblock: Test invalid coinbase transaction")
assert_raises_rpc_error(-22, "Block does not start with a coinbase",
node.submitblock,
bad_block.serialize().hex())
self.log.info("getblocktemplate: Test truncated final transaction")
assert_raises_rpc_error(-22, "Block decode failed",
node.getblocktemplate, {
'data': block.serialize()[:-1].hex(),
'mode': 'proposal'
})
self.log.info(
"getblocktemplate: Test duplicate transaction, results in 'bad-tx-coinbase'"
)
bad_block = copy.deepcopy(block)
bad_block.vtx.append(bad_block.vtx[0])
prepare_block(bad_block)
assert_template(node, bad_block, 'bad-tx-coinbase')
assert_submitblock(bad_block, 'bad-tx-coinbase', 'bad-tx-coinbase')
self.log.info("getblocktemplate: Test invalid transaction")
bad_block = copy.deepcopy(block)
bad_tx = copy.deepcopy(bad_block.vtx[0])
bad_tx.vin[0].prevout.hash = 255
bad_tx.rehash()
bad_block.vtx.append(bad_tx)
prepare_block(bad_block)
assert_template(node, bad_block, 'bad-txns-inputs-missingorspent')
assert_submitblock(bad_block, 'bad-txns-inputs-missingorspent')
self.log.info("getblocktemplate: Test nonfinal transaction")
bad_block = copy.deepcopy(block)
bad_block.vtx[0].nLockTime = 2**32 - 1
bad_block.vtx[0].rehash()
assert_template(node, bad_block, 'bad-txns-nonfinal')
assert_submitblock(bad_block, 'bad-txns-nonfinal')
self.log.info("getblocktemplate: Test bad tx count")
# The tx count is immediately after the block header
bad_block_sn = bytearray(block.serialize())
# Check metadata is empty (for now)
assert_equal(bad_block_sn[BLOCK_HEADER_SIZE], 0)
# Check num txs = 1, which is behind the header and metadata
assert_equal(bad_block_sn[BLOCK_HEADER_SIZE + 1], 1)
# Increase num txs by 1 artificially
bad_block_sn[BLOCK_HEADER_SIZE + 1] += 1
assert_raises_rpc_error(-22, "Block decode failed",
node.getblocktemplate, {
'data': bad_block_sn.hex(),
'mode': 'proposal'
})
self.log.info("getblocktemplate: Test bad bits")
bad_block = copy.deepcopy(block)
bad_block.nBits = 469762303 # impossible in the real world
assert_template(node, bad_block, 'bad-diffbits')
self.log.info("getblocktemplate: Test bad merkle root")
bad_block = copy.deepcopy(block)
bad_block.hashMerkleRoot += 1
assert_template(node, bad_block, 'bad-txnmrklroot', False)
assert_submitblock(bad_block, 'bad-txnmrklroot', 'bad-txnmrklroot')
self.log.info("getblocktemplate: Test bad timestamps")
bad_block = copy.deepcopy(block)
bad_block.nTime = 2**31 - 1
assert_template(node, bad_block, 'time-too-new')
assert_submitblock(bad_block, 'time-too-new', 'time-too-new')
bad_block.nTime = 0
assert_template(node, bad_block, 'time-too-old')
assert_submitblock(bad_block, 'time-too-old', 'time-too-old')
self.log.info("getblocktemplate: Test not best block")
bad_block = copy.deepcopy(block)
bad_block.hashPrevBlock = 123
assert_template(node, bad_block, 'inconclusive-not-best-prevblk')
assert_submitblock(bad_block, 'prev-blk-not-found',
'prev-blk-not-found')
self.log.info('submitheader tests')
assert_raises_rpc_error(
-22, 'Block header decode failed',
lambda: node.submitheader(hexdata='xx' * BLOCK_HEADER_SIZE))
assert_raises_rpc_error(
-22, 'Block header decode failed',
lambda: node.submitheader(hexdata='ff' * (BLOCK_HEADER_SIZE - 2)))
assert_raises_rpc_error(
-25, 'Must submit previous header', lambda: node.submitheader(
hexdata=super(CBlock, bad_block).serialize().hex()))
block.nTime += 1
block.solve()
def chain_tip(b_hash, *, status='headers-only', branchlen=1):
return {
'hash': b_hash,
'height': 202,
'branchlen': branchlen,
'status': status
}
assert chain_tip(block.hash) not in node.getchaintips()
node.submitheader(hexdata=block.serialize().hex())
assert chain_tip(block.hash) in node.getchaintips()
# Noop
node.submitheader(hexdata=CBlockHeader(block).serialize().hex())
assert chain_tip(block.hash) in node.getchaintips()
bad_block_root = copy.deepcopy(block)
bad_block_root.hashMerkleRoot += 2
bad_block_root.solve()
assert chain_tip(bad_block_root.hash) not in node.getchaintips()
node.submitheader(
hexdata=CBlockHeader(bad_block_root).serialize().hex())
assert chain_tip(bad_block_root.hash) in node.getchaintips()
# Should still reject invalid blocks, even if we have the header:
assert_equal(
node.submitblock(hexdata=bad_block_root.serialize().hex()),
'bad-txnmrklroot')
assert_equal(
node.submitblock(hexdata=bad_block_root.serialize().hex()),
'bad-txnmrklroot')
assert chain_tip(bad_block_root.hash) in node.getchaintips()
# We know the header for this invalid block, so should just return
# early without error:
node.submitheader(
hexdata=CBlockHeader(bad_block_root).serialize().hex())
assert chain_tip(bad_block_root.hash) in node.getchaintips()
bad_block_lock = copy.deepcopy(block)
bad_block_lock.vtx[0].nLockTime = 2**32 - 1
bad_block_lock.vtx[0].rehash()
bad_block_lock.hashMerkleRoot = bad_block_lock.calc_merkle_root()
bad_block_lock.solve()
assert_equal(
node.submitblock(hexdata=bad_block_lock.serialize().hex()),
'bad-txns-nonfinal')
assert_equal(
node.submitblock(hexdata=bad_block_lock.serialize().hex()),
'duplicate-invalid')
# Build a "good" block on top of the submitted bad block
bad_block2 = copy.deepcopy(block)
bad_block2.hashPrevBlock = bad_block_lock.sha256
bad_block2.solve()
assert_raises_rpc_error(
-25, 'bad-prevblk', lambda: node.submitheader(hexdata=CBlockHeader(
bad_block2).serialize().hex()))
# Should reject invalid header right away
bad_block_time = copy.deepcopy(block)
bad_block_time.nTime = 1
bad_block_time.solve()
assert_raises_rpc_error(
-25, 'time-too-old', lambda: node.submitheader(
hexdata=CBlockHeader(bad_block_time).serialize().hex()))
# Should ask for the block from a p2p node, if they announce the header
# as well:
node.add_p2p_connection(P2PDataStore())
# Drop the first getheaders
node.p2p.wait_for_getheaders(timeout=5)
node.p2p.send_blocks_and_test(blocks=[block], node=node)
# Must be active now:
assert chain_tip(block.hash, status='active',
branchlen=0) in node.getchaintips()
# Building a few blocks should give the same results
node.generatetoaddress(10, node.get_deterministic_priv_key().address)
assert_raises_rpc_error(
-25, 'time-too-old', lambda: node.submitheader(
hexdata=CBlockHeader(bad_block_time).serialize().hex()))
assert_raises_rpc_error(
-25, 'bad-prevblk', lambda: node.submitheader(hexdata=CBlockHeader(
bad_block2).serialize().hex()))
node.submitheader(hexdata=CBlockHeader(block).serialize().hex())
node.submitheader(
hexdata=CBlockHeader(bad_block_root).serialize().hex())
# valid
assert_equal(node.submitblock(hexdata=block.serialize().hex()),
'duplicate')
# Sanity check that maxtries supports large integers
node.generatetoaddress(1,
node.get_deterministic_priv_key().address,
pow(2, 32))
