def __init__(self, unspent):
"""Create ElementsUTXO from scanutxoset (processed) output"""
self.txid = h2b_rev(unspent.get('txid'))
self.vout = unspent.get('vout')
self.script_pubkey = h2b(unspent.get('scriptPubKey'))
self.address = unspent.get('address')
self.height = unspent.get('height')
# blinded data
is_unblinded = 'asset' in unspent and 'amount' in unspent
self.asset = h2b_rev(unspent['asset']) if is_unblinded else None
self.value = round(unspent['amount'] * 10**8) if is_unblinded else None
self.abf = b'\x00' * 32 if self.asset else None
self.vbf = b'\x00' * 32 if self.value else None
self.asset_commitment = \
b'\x01' + self.asset if is_unblinded else \
h2b(unspent.get('assetcommitment'))
self.value_commitment = \
wally.tx_confidential_value_from_satoshi(self.value) if is_unblinded else \
h2b(unspent.get('amountcommitment'))
self.nonce_commitment = \
b'' if is_unblinded else \
h2b(unspent.get('noncecommitment'))
self.rangeproof = \
b'' if is_unblinded else \
h2b(unspent.get('rangeproof'))
def _get_sighash(self, wally_tx, index, utxo):
flags = wally.WALLY_TX_FLAG_USE_WITNESS
prevout_script = wally.hex_to_bytes(utxo['prevout_script'])
if utxo['confidential']:
value = bytes.fromhex(utxo['commitment'])
else:
value = wally.tx_confidential_value_from_satoshi(utxo['satoshi'])
return wally.tx_get_elements_signature_hash(
wally_tx, index, prevout_script, value, wally.WALLY_SIGHASH_ALL, flags)
def add_unblinded_output(tx_, script, asset, amount):
wally.tx_add_elements_raw_output(
tx_,
script,
b'\x01' + h2b_rev(asset),
wally.tx_confidential_value_from_satoshi(btc2sat(amount)),
None, # nonce
None, # surjection proof
None, # range proof
0)
abfs_in, asset_generators_in)
wally.tx_add_elements_raw_output(output_tx, script_pubkey, generator,
value_commitment, ephemeral_pubkey,
surjectionproof, rangeproof, 0)
# end-create_outputs
# start-add_fee
BITCOIN = "5ac9f65c0efcc4775e0baec4ec03abdde22473cd3cf33c0419ca290e0751b225"
BITCOIN = wally.hex_to_bytes(BITCOIN)[::-1]
wally.tx_add_elements_raw_output(
output_tx,
None,
bytearray([0x01]) + BITCOIN,
wally.tx_confidential_value_from_satoshi(fee),
None, # nonce
None, # surjection proof
None, # range proof
0)
# end-add_fee
# start-sign
vout = 0
prev_txid = wally.tx_get_txid(tx)
for vin, script_pubkey in zip(vouts_in, script_pubkeys_in):
wally.tx_add_elements_raw_input(
output_tx,
prev_txid,
vin,