#!/usr/bin/env python3 # Copyright (c) 2015-2018 The Bitcoin Core developers # Distributed under the MIT software license, see the accompanying # file COPYING or http://www.opensource.org/licenses/mit-license.php. """Utilities for manipulating blocks and transactions.""" from decimal import Decimal import unittest from .messages import ( CBlock, CCbTx, COIN, COutPoint, CTransaction, CTxIn, CTxOut, FromHex, uint256_to_string, ) from .script import CScript, CScriptNum, CScriptOp, OP_TRUE, OP_CHECKSIG from .util import assert_equal, hex_str_to_bytes from io import BytesIO MAX_BLOCK_SIGOPS = 20000 # Genesis block time (regtest) TIME_GENESIS_BLOCK = 1417713337 # Coinbase transaction outputs can only be spent after this number of new blocks (network rule) COINBASE_MATURITY = 100 def create_block(hashprev, coinbase, ntime=None, *, version=1): """Create a block (with regtest difficulty).""" block = CBlock() block.nVersion = version if ntime is None: import time block.nTime = int(time.time() + 600) else: block.nTime = ntime block.hashPrevBlock = hashprev block.nBits = 0x207fffff # difficulty retargeting is disabled in REGTEST chainparams block.vtx.append(coinbase) block.hashMerkleRoot = block.calc_merkle_root() block.calc_sha256() return block def create_block_with_mnpayments(mninfo, node, vtx=None, mn_payee=None, mn_amount=None): if vtx is None: vtx = [] bt = node.getblocktemplate() height = bt['height'] tip_hash = bt['previousblockhash'] coinbasevalue = bt['coinbasevalue'] assert len(bt['masternode']) <= 2 if mn_payee is None: mn_payee = bt['masternode'][0]['payee'] mn_operator_payee = None if len(bt['masternode']) == 2: mn_operator_payee = bt['masternode'][1]['payee'] # we can't take the masternode payee amount from the template here as we might have additional fees in vtx # calculate fees that the block template included (we'll have to remove it from the coinbase as we won't # include the template's transactions bt_fees = 0 for tx in bt['transactions']: bt_fees += tx['fee'] new_fees = 0 for tx in vtx: in_value = 0 out_value = 0 for txin in tx.vin: txout = node.gettxout(uint256_to_string(txin.prevout.hash), txin.prevout.n, False) in_value += int(txout['value'] * COIN) for txout in tx.vout: out_value += txout.nValue new_fees += in_value - out_value # fix fees coinbasevalue -= bt_fees coinbasevalue += new_fees operator_reward = 0 if mn_operator_payee is not None: for mn in mninfo: if mn.rewards_address == mn_payee: operator_reward = mn.operator_reward break assert operator_reward > 0 mn_operator_amount = 0 if mn_amount is None: v20_info = node.getblockchaininfo()['softforks']['v20'] mn_amount_total = get_masternode_payment(height, coinbasevalue, v20_info['active']) mn_operator_amount = mn_amount_total * operator_reward // 100 mn_amount = mn_amount_total - mn_operator_amount miner_amount = coinbasevalue - mn_amount - mn_operator_amount miner_address = node.get_deterministic_priv_key().address outputs = {miner_address: str(Decimal(miner_amount) / COIN)} if mn_amount > 0: outputs[mn_payee] = str(Decimal(mn_amount) / COIN) if mn_operator_amount > 0: outputs[mn_operator_payee] = str(Decimal(mn_operator_amount) / COIN) coinbase = FromHex(CTransaction(), node.createrawtransaction([], outputs)) coinbase.vin = create_coinbase(height).vin # We can't really use this one as it would result in invalid merkle roots for masternode lists if len(bt['coinbase_payload']) != 0: tip_block = node.getblock(tip_hash) cbtx = FromHex(CCbTx(version=1), bt['coinbase_payload']) if 'cbTx' in tip_block: cbtx.merkleRootMNList = int(tip_block['cbTx']['merkleRootMNList'], 16) else: cbtx.merkleRootMNList = 0 coinbase.nVersion = 3 coinbase.nType = 5 # CbTx coinbase.vExtraPayload = cbtx.serialize() coinbase.calc_sha256() block = create_block(int(tip_hash, 16), coinbase, ntime=bt['curtime'], version=bt['version']) block.vtx += vtx # Add quorum commitments from template for tx in bt['transactions']: tx2 = FromHex(CTransaction(), tx['data']) if tx2.nType == 6: block.vtx.append(tx2) block.hashMerkleRoot = block.calc_merkle_root() block.solve() return block def script_BIP34_coinbase_height(height): if height <= 16: res = CScriptOp.encode_op_n(height) # Append dummy to increase scriptSig size above 2 (see bad-cb-length consensus rule) return CScript([res, OP_TRUE]) return CScript([CScriptNum(height)]) def create_coinbase(height, pubkey=None, dip4_activated=False, v20_activated=False, nValue=500): """Create a coinbase transaction, assuming no miner fees. If pubkey is passed in, the coinbase output will be a P2PK output; otherwise an anyone-can-spend output.""" coinbase = CTransaction() coinbase.vin.append(CTxIn(COutPoint(0, 0xffffffff), script_BIP34_coinbase_height(height), 0xffffffff)) coinbaseoutput = CTxOut() coinbaseoutput.nValue = nValue * COIN if nValue == 500: halvings = int(height / 150) # regtest coinbaseoutput.nValue >>= halvings if (pubkey is not None): coinbaseoutput.scriptPubKey = CScript([pubkey, OP_CHECKSIG]) else: coinbaseoutput.scriptPubKey = CScript([OP_TRUE]) coinbase.vout = [coinbaseoutput] if dip4_activated: coinbase.nVersion = 3 coinbase.nType = 5 cbtx_version = 3 if v20_activated else 2 cbtx_payload = CCbTx(cbtx_version, height, 0, 0, 0) coinbase.vExtraPayload = cbtx_payload.serialize() coinbase.calc_sha256() return coinbase def create_tx_with_script(prevtx, n, script_sig=b"", *, amount, script_pub_key=CScript()): """Return one-input, one-output transaction object spending the prevtx's n-th output with the given amount. Can optionally pass scriptPubKey and scriptSig, default is anyone-can-spend output. """ tx = CTransaction() assert n < len(prevtx.vout) tx.vin.append(CTxIn(COutPoint(prevtx.sha256, n), script_sig, 0xffffffff)) tx.vout.append(CTxOut(amount, script_pub_key)) tx.calc_sha256() return tx def create_transaction(node, txid, to_address, *, amount): """ Return signed transaction spending the first output of the input txid. Note that the node must be able to sign for the output that is being spent, and the node must not be running multiple wallets. """ raw_tx = create_raw_transaction(node, txid, to_address, amount=amount) tx = CTransaction() tx.deserialize(BytesIO(hex_str_to_bytes(raw_tx))) return tx def create_raw_transaction(node, txid, to_address, *, amount): """ Return raw signed transaction spending the first output of the input txid. Note that the node must be able to sign for the output that is being spent, and the node must not be running multiple wallets. """ rawtx = node.createrawtransaction(inputs=[{"txid": txid, "vout": 0}], outputs={to_address: amount}) signresult = node.signrawtransactionwithwallet(rawtx) assert_equal(signresult["complete"], True) return signresult['hex'] def get_legacy_sigopcount_block(block, accurate=True): count = 0 for tx in block.vtx: count += get_legacy_sigopcount_tx(tx, accurate) return count def get_legacy_sigopcount_tx(tx, accurate=True): count = 0 for i in tx.vout: count += i.scriptPubKey.GetSigOpCount(accurate) for j in tx.vin: # scriptSig might be of type bytes, so convert to CScript for the moment count += CScript(j.scriptSig).GetSigOpCount(accurate) return count # Identical to GetMasternodePayment in C++ code def get_masternode_payment(nHeight, blockValue, fV20Active): ret = int(blockValue / 5) nMNPIBlock = 350 nMNPIPeriod = 10 nReallocActivationHeight = 2500 if nHeight > nMNPIBlock: ret += int(blockValue / 20) if nHeight > nMNPIBlock+(nMNPIPeriod* 1): ret += int(blockValue / 20) if nHeight > nMNPIBlock+(nMNPIPeriod* 2): ret += int(blockValue / 20) if nHeight > nMNPIBlock+(nMNPIPeriod* 3): ret += int(blockValue / 40) if nHeight > nMNPIBlock+(nMNPIPeriod* 4): ret += int(blockValue / 40) if nHeight > nMNPIBlock+(nMNPIPeriod* 5): ret += int(blockValue / 40) if nHeight > nMNPIBlock+(nMNPIPeriod* 6): ret += int(blockValue / 40) if nHeight > nMNPIBlock+(nMNPIPeriod* 7): ret += int(blockValue / 40) if nHeight > nMNPIBlock+(nMNPIPeriod* 9): ret += int(blockValue / 40) if nHeight < nReallocActivationHeight: # Block Reward Realocation is not activated yet, nothing to do return ret nSuperblockCycle = 10 # Actual realocation starts in the cycle next to one activation happens in nReallocStart = nReallocActivationHeight - nReallocActivationHeight % nSuperblockCycle + nSuperblockCycle if nHeight < nReallocStart: # Activated but we have to wait for the next cycle to start realocation, nothing to do return ret if fV20Active: # Once MNRewardReallocated activates, block reward is 80% of block subsidy (+ tx fees) since treasury is 20% # Since the MN reward needs to be equal to 60% of the block subsidy (according to the proposal), MN reward is set to 75% of the block reward. # Previous reallocation periods are dropped. return blockValue * 3 // 4 # Periods used to reallocate the masternode reward from 50% to 60% vecPeriods = [ 513, # Period 1: 51.3% 526, # Period 2: 52.6% 533, # Period 3: 53.3% 540, # Period 4: 54% 546, # Period 5: 54.6% 552, # Period 6: 55.2% 557, # Period 7: 55.7% 562, # Period 8: 56.2% 567, # Period 9: 56.7% 572, # Period 10: 57.2% 577, # Period 11: 57.7% 582, # Period 12: 58.2% 585, # Period 13: 58.5% 588, # Period 14: 58.8% 591, # Period 15: 59.1% 594, # Period 16: 59.4% 597, # Period 17: 59.7% 599, # Period 18: 59.9% 600 # Period 19: 60% ] nReallocCycle = nSuperblockCycle * 3 nCurrentPeriod = min(int((nHeight - nReallocStart) / nReallocCycle), len(vecPeriods) - 1) return int(blockValue * vecPeriods[nCurrentPeriod] / 1000) class TestFrameworkBlockTools(unittest.TestCase): def test_create_coinbase(self): height = 20 coinbase_tx = create_coinbase(height=height) assert_equal(CScriptNum.decode(coinbase_tx.vin[0].scriptSig), height)