be16f80abc
Any projects which want to use Hush code from now on will need to be licensed as GPLv3 or we will send the lawyers: https://www.softwarefreedom.org/ Notably, Komodo (KMD) is licensed as GPLv2 and is no longer compatible to receive code changes, without causing legal issues. MIT projects, such as Zcash, also cannot pull in changes from the Hush Full Node without permission from The Hush Developers, which may in some circumstances grant an MIT license on a case-by-case basis.
79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
# blocktools.py - utilities for manipulating blocks and transactions
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#
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# Distributed under the GPLv3 software license, see the accompanying
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# file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
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#
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from mininode import CBlock, CTransaction, CTxIn, CTxOut, COutPoint
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from script import CScript, OP_0, OP_EQUAL, OP_HASH160
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# Create a block (with regtest difficulty)
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def create_block(hashprev, coinbase, nTime=None, nBits=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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if nBits is None:
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block.nBits = 0x200f0f0f # Will break after a difficulty adjustment...
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else:
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block.nBits = nBits
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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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CScript([counter+heightAdjust, OP_0]), 0xffffffff))
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counter += 1
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coinbaseoutput = CTxOut()
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coinbaseoutput.nValue = int(12.5*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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if halvings == 0: # regtest
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froutput = CTxOut()
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froutput.nValue = coinbaseoutput.nValue / 5
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# regtest
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fraddr = bytearray([0x67, 0x08, 0xe6, 0x67, 0x0d, 0xb0, 0xb9, 0x50,
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0xda, 0xc6, 0x80, 0x31, 0x02, 0x5c, 0xc5, 0xb6,
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0x32, 0x13, 0xa4, 0x91])
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froutput.scriptPubKey = CScript([OP_HASH160, fraddr, OP_EQUAL])
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coinbaseoutput.nValue -= froutput.nValue
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coinbase.vout = [ coinbaseoutput, froutput ]
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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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