5323a08afa
fabcee1 Remove copyright header from autogenerated chainparamsseeds.h (MarcoFalke) fa60d05 Add missing copyright headers (MarcoFalke) fa7e4c0 Bump copyright headers to 2014 (MarcoFalke)
68 lines
2.2 KiB
Python
68 lines
2.2 KiB
Python
# blocktools.py - utilities for manipulating blocks and transactions
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# Copyright (c) 2015 The Bitcoin Core developers
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# Distributed under the MIT/X11 software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#
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from .mininode import *
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from .script import CScript, OP_TRUE, OP_CHECKSIG
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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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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 = 500 * 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 with an anyone-can-spend output, that spends the
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# nth output of prevtx.
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def create_transaction(prevtx, n, sig, value):
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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, b""))
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tx.calc_sha256()
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return tx
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