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111 lines
3.8 KiB
Python
111 lines
3.8 KiB
Python
#!/usr/bin/env python3
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# Copyright (c) 2015-2017 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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"""Utilities for manipulating blocks and transactions."""
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from .mininode import *
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from .script import CScript, OP_TRUE, OP_CHECKSIG, OP_RETURN
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# Create a block (with regtest difficulty)
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def create_block(hashprev, coinbase, nTime=None):
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block = CBlock()
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if nTime is None:
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import time
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block.nTime = int(time.time()+600)
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else:
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block.nTime = nTime
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block.hashPrevBlock = hashprev
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block.nBits = 0x207fffff # Will break after a difficulty adjustment...
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block.vtx.append(coinbase)
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block.hashMerkleRoot = block.calc_merkle_root()
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block.calc_sha256()
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return block
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# From BIP141
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WITNESS_COMMITMENT_HEADER = b"\xaa\x21\xa9\xed"
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def get_witness_script(witness_root, witness_nonce):
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witness_commitment = uint256_from_str(hash256(ser_uint256(witness_root)+ser_uint256(witness_nonce)))
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output_data = WITNESS_COMMITMENT_HEADER + ser_uint256(witness_commitment)
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return CScript([OP_RETURN, output_data])
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# According to BIP141, blocks with witness rules active must commit to the
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# hash of all in-block transactions including witness.
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def add_witness_commitment(block, nonce=0):
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# First calculate the merkle root of the block's
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# transactions, with witnesses.
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witness_nonce = nonce
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witness_root = block.calc_witness_merkle_root()
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# witness_nonce should go to coinbase witness.
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block.vtx[0].wit.vtxinwit = [CTxInWitness()]
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block.vtx[0].wit.vtxinwit[0].scriptWitness.stack = [ser_uint256(witness_nonce)]
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# witness commitment is the last OP_RETURN output in coinbase
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block.vtx[0].vout.append(CTxOut(0, get_witness_script(witness_root, witness_nonce)))
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block.vtx[0].rehash()
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block.hashMerkleRoot = block.calc_merkle_root()
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block.rehash()
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def serialize_script_num(value):
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r = bytearray(0)
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if value == 0:
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return r
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neg = value < 0
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absvalue = -value if neg else value
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while (absvalue):
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r.append(int(absvalue & 0xff))
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absvalue >>= 8
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if r[-1] & 0x80:
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r.append(0x80 if neg else 0)
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elif neg:
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r[-1] |= 0x80
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return r
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# Create a coinbase transaction, assuming no miner fees.
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# If pubkey is passed in, the coinbase output will be a P2PK output;
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# otherwise an anyone-can-spend output.
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def create_coinbase(height, pubkey = None):
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coinbase = CTransaction()
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coinbase.vin.append(CTxIn(COutPoint(0, 0xffffffff),
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ser_string(serialize_script_num(height)), 0xffffffff))
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coinbaseoutput = CTxOut()
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coinbaseoutput.nValue = 50 * COIN
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halvings = int(height/150) # regtest
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coinbaseoutput.nValue >>= halvings
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if (pubkey != None):
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coinbaseoutput.scriptPubKey = CScript([pubkey, OP_CHECKSIG])
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else:
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coinbaseoutput.scriptPubKey = CScript([OP_TRUE])
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coinbase.vout = [ coinbaseoutput ]
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coinbase.calc_sha256()
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return coinbase
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# Create a transaction.
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# If the scriptPubKey is not specified, make it anyone-can-spend.
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def create_transaction(prevtx, n, sig, value, scriptPubKey=CScript()):
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tx = CTransaction()
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assert(n < len(prevtx.vout))
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tx.vin.append(CTxIn(COutPoint(prevtx.sha256, n), sig, 0xffffffff))
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tx.vout.append(CTxOut(value, scriptPubKey))
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tx.calc_sha256()
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return tx
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def get_legacy_sigopcount_block(block, fAccurate=True):
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count = 0
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for tx in block.vtx:
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count += get_legacy_sigopcount_tx(tx, fAccurate)
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return count
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def get_legacy_sigopcount_tx(tx, fAccurate=True):
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count = 0
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for i in tx.vout:
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count += i.scriptPubKey.GetSigOpCount(fAccurate)
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for j in tx.vin:
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# scriptSig might be of type bytes, so convert to CScript for the moment
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count += CScript(j.scriptSig).GetSigOpCount(fAccurate)
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return count
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