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67 lines
2.2 KiB
67 lines
2.2 KiB
# 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(chr(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 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, "")) |
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tx.calc_sha256() |
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return tx
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