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# blocktools.py - utilities for manipulating blocks and transactions
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#
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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 CBlock, CTransaction, CTxIn, CTxOut, COutPoint, ser_string
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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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counter=1
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# Create an anyone-can-spend coinbase transaction, assuming no miner fees
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def create_coinbase(heightAdjust = 0):
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global counter
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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(counter+heightAdjust)), 0xffffffff))
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counter += 1
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coinbaseoutput = CTxOut()
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coinbaseoutput.nValue = 50*100000000
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halvings = int((counter+heightAdjust)/150) # regtest
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coinbaseoutput.nValue >>= halvings
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coinbaseoutput.scriptPubKey = ""
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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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