def new_tx(utxo=None, target_sigops=20000, target_tx_size=ONE_MEGABYTE):
padding_size = calc_needed_data_size([OP_CHECKSIG] * target_sigops, target_tx_size)
if utxo != None:
tx_to_spend = utxo['txid']
vout = utxo['vout']
value = utxo['amount']
tx = CTransaction()
script = CScript([OP_CHECKSIG] * target_sigops)
tx.vout.append(CTxOut(200000000, script))
tx.vout.append(CTxOut(200000000, CScript([OP_DUP, OP_HASH160,
hex_str_to_bytes(
"ab812dc588ca9d5787dde7eb29569da63c3a238c"),
OP_EQUALVERIFY,
OP_CHECKSIG])))
tx.vout.append(CTxOut(150000000, CScript([OP_FALSE, OP_RETURN] + [bytes(5)[:1] * padding_size])))
if utxo == None:
txHex = node.fundrawtransaction(ToHex(tx), {'feeRate': 2, 'changePosition': len(tx.vout)})[
'hex']
else:
tx.vin.append(CTxIn(COutPoint(uint256_from_str(hex_str_to_bytes(tx_to_spend)[::-1]), vout)))
txHex = ToHex(tx)
txHex = node.signrawtransaction(txHex)['hex']
tx = FromHex(CTransaction(), txHex)
tx.rehash()
return tx
def new_tx(utxo=None,
target_script_size=20000,
op_codes=[OP_TRUE],
elem=[b"a" * 499, OP_DROP],
target_tx_size=None,
simple=False,
lock_script=None,
unlock_script=b""):
if utxo != None:
tx_to_spend = utxo['txid']
vout = utxo['vout']
value = utxo['amount']
if simple:
tx = create_transaction(tx_to_spend, vout, unlock_script,
value - target_script_size - 2000)
tx.rehash()
return tx
tx = CTransaction()
if (lock_script != None):
tx.vout.append(CTxOut(200000000, lock_script))
else:
script = make_script(op_codes=op_codes,
elem=elem,
target_script_size=target_script_size)
tx.vout.append(CTxOut(200000000, script))
tx.vout.append(
CTxOut(
200000000,
CScript([
OP_DUP, OP_HASH160,
hex_str_to_bytes(
"ab812dc588ca9d5787dde7eb29569da63c3a238c"),
OP_EQUALVERIFY, OP_CHECKSIG
])))
if target_tx_size != None:
padding_size = calc_needed_data_size(script, target_tx_size)
tx.vout.append(
CTxOut(
50000000,
CScript([OP_FALSE, OP_RETURN] +
[bytes(5)[:1] * padding_size])))
if utxo == None:
txHex = node.fundrawtransaction(ToHex(tx), {
'feeRate': 2,
'changePosition': len(tx.vout)
})['hex']
else:
tx.vin.append(
CTxIn(
COutPoint(
uint256_from_str(
hex_str_to_bytes(tx_to_spend)[::-1]), vout)))
txHex = ToHex(tx)
txHex = node.signrawtransaction(txHex)['hex']
tx = FromHex(CTransaction(), txHex)
tx.rehash()
return tx
def fill_outputs(self, tx, n_outputs, script_op_codes, fund, total_bytes):
for amount, n_bytes in zip(self._split_int(fund, n_outputs),
self._split_int(total_bytes, n_outputs)):
script = CScript(
script_op_codes +
[b"a" * calc_needed_data_size(script_op_codes, n_bytes)])
assert len(script) == n_bytes
tx.vout.append(CTxOut(amount, script))
def make_script(op_codes=[OP_TRUE], elem=[b"a" * 499, OP_DROP], target_script_size=MAX_SCRIPT_SIZE_BEFORE_GENESIS):
elem_len = len(CScript(elem))
max_size = calc_needed_data_size(op_codes, target_script_size)
remainder = (max_size - len(CScript(op_codes + elem * (int)(floor(max_size / elem_len)))))
script = CScript(op_codes + elem * (int)(floor(max_size / elem_len)) + [b"a" * remainder, OP_DROP])
if len(script) > target_script_size:
remainder -= (len(script) - target_script_size)
script = CScript(op_codes + elem * (int)(floor(max_size / elem_len)) + elem)
return script
def make_unlock_script(elem=[b"a" * 500], target_script_size=MAX_SCRIPT_SIZE_BEFORE_GENESIS):
elem_len = len(CScript(elem))
max_size = calc_needed_data_size([], (target_script_size))
remainder = (max_size - len(CScript(elem * (int)(floor(max_size / elem_len)))))
script = CScript([] + elem * (int)(floor(max_size / elem_len)) + [b"a" * remainder, b""])
if len(script) > target_script_size:
remainder -= (len(script) - target_script_size)
script = CScript([] + elem * (int)(floor(max_size / elem_len)) + [b"a" * remainder, b""])
return script
