98 lines
3.6 KiB
Python
98 lines
3.6 KiB
Python
#!/usr/bin/env python3
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# blocktools.py - utilities for manipulating blocks and transactions
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# Copyright (c) 2015-2016 The Bitcoin Core developers
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# Copyright (c) 2017-2022 The Zcash developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or https://www.opensource.org/licenses/mit-license.php .
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from hashlib import blake2b
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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, 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, nBits=None, hashFinalSaplingRoot=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 hashFinalSaplingRoot is None:
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# By default NUs up to Sapling are active from block 1, so we set this to the empty root.
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hashFinalSaplingRoot = 0x3e49b5f954aa9d3545bc6c37744661eea48d7c34e3000d82b7f0010c30f4c2fb
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block.hashFinalSaplingRoot = hashFinalSaplingRoot
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if nBits is None:
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block.nBits = 0x200f0f0f # difficulty retargeting is disabled in REGTEST chainparams
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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.hashAuthDataRoot = block.calc_auth_data_root()
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block.calc_sha256()
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return block
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def derive_block_commitments_hash(chain_history_root, auth_data_root):
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digest = blake2b(
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digest_size=32,
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person=b'ZcashBlockCommit')
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digest.update(chain_history_root)
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digest.update(auth_data_root)
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digest.update(b'\x00' * 32)
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return digest.digest()
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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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CScript([height, OP_0]), 0xffffffff))
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coinbaseoutput = CTxOut()
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coinbaseoutput.nValue = int(12.5*100000000)
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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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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, b""))
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tx.calc_sha256()
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return tx
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