def init_db():
Base.metadata.create_all(engine)
ini_prik = bsv()
session.bulk_insert_mappings(PrivateKeyList,
[{
'PrivateKey': ini_prik.to_wif(),
'Address': ini_prik.address,
'is_activated': True
}])
session.commit()
def create_p2pkh_transaction(utxosets, outputs, custom_pushdata=False):
version = VERSION_1
lock_time = LOCK_TIME
# sequence = SEQUENCE
hash_type = HASH_TYPE
unspents = [Unspent.from_dict(utxo) for utxo in utxosets]
input_count = int_to_varint(len(unspents))
output_count = int_to_varint(len(outputs))
output_block = construct_output_block(outputs,
custom_pushdata=custom_pushdata)
# Optimize for speed, not memory, by pre-computing values.
inputs = []
for unspent in unspents:
txid = hex_to_bytes(unspent.txid)[::-1]
txindex = unspent.txindex.to_bytes(4, byteorder='little')
amount = unspent.amount.to_bytes(8, byteorder='little')
inputs.append(TxIn('', 0, txid, txindex, amount))
hashPrevouts = double_sha256(b''.join([i.txid + i.txindex
for i in inputs]))
hashSequence = double_sha256(b''.join([SEQUENCE for i in inputs]))
hashOutputs = double_sha256(output_block)
# scriptCode_len is part of the script.
for i, txin in enumerate(inputs):
private_key = bsv(wif=utxosets[i]['PrivateKey'])
public_key = bytes.fromhex(private_key.public_key)
public_key_len = len(public_key).to_bytes(1, byteorder='little')
scriptCode = (OP_DUP + OP_HASH160 + OP_PUSH_20 +
address_to_public_key_hash(private_key.address) +
OP_EQUALVERIFY + OP_CHECKSIG)
scriptCode_len = int_to_varint(len(scriptCode))
to_be_hashed = (version + hashPrevouts + hashSequence + txin.txid +
txin.txindex + scriptCode_len + scriptCode +
txin.amount + SEQUENCE + hashOutputs + lock_time +
hash_type)
hashed = sha256(to_be_hashed) # BIP-143: Used for Bitcoin SV
# signature = private_key.sign(hashed) + b'\x01'
signature = private_key.sign(hashed) + b'\x41'
script_sig = (len(signature).to_bytes(1, byteorder='little') +
signature + public_key_len + public_key)
inputs[i].script = script_sig
inputs[i].script_len = int_to_varint(len(script_sig))
return bytes_to_hex(version + input_count + construct_input_block(inputs) +
output_count + output_block + lock_time)
def get_new_address(self):
result = session.query(PrivateKeyList).filter_by(
is_activated=True).one()
result.is_activated = False
session.add(result)
prik = bsv()
session.bulk_insert_mappings(PrivateKeyList,
[{
'PrivateKey': prik.to_wif(),
'Address': prik.address,
'is_activated': True
}])
session.commit()
self.address = get_recieve_address()
self.ids.qr.data = self.address
self.ids.recieve_address.text = self.address
return self.address
def on_press_button(self):
self.ids.button.text = bsv().address
def generate_sighash_single_rawtx(utxosets, changeaddress, authrized_amount):
unspents = [Unspent.from_dict(utxo) for utxo in utxosets]
version = VERSION_1
lock_time = LOCK_TIME
#sequence = SEQUENCE
input_count = int_to_varint(len(unspents))
inputs = []
total_input_amount = 0
for unspent in unspents:
txid = hex_to_bytes(unspent.txid)[::-1]
txindex = unspent.txindex.to_bytes(4, byteorder='little')
amount = unspent.amount.to_bytes(8, byteorder='little')
inputs.append(TxIn('', 0, txid, txindex, amount))
total_input_amount += unspent.amount #satoshi
output_count = int_to_varint(1)
output_block = b''
output_script = (OP_DUP + OP_HASH160 + OP_PUSH_20 +
address_to_public_key_hash(changeaddress) +
OP_EQUALVERIFY + OP_CHECKSIG)
output_block += (total_input_amount - authrized_amount).to_bytes(
8, byteorder='little') #satoshi
output_block += int_to_varint(len(output_script))
output_block += output_script
hashPrevouts = double_sha256(b''.join([i.txid + i.txindex
for i in inputs]))
hashSequence = bytes.fromhex(
'0000000000000000000000000000000000000000000000000000000000000000')
# scriptCode_len is part of the script.
for i, txin in enumerate(inputs):
if i == 0:
hashOutputs = double_sha256(output_block)
hash_type = 0x43.to_bytes(4, byteorder='little') #sighash single
else:
hashOutputs = bytes.fromhex(
'0000000000000000000000000000000000000000000000000000000000000000'
)
hash_type = 0x42.to_bytes(4, byteorder='little') #sighash none
private_key = bsv(utxosets[i]['PrivateKey'])
public_key = bytes.fromhex(private_key.public_key)
public_key_len = len(public_key).to_bytes(1, byteorder='little')
scriptCode = (OP_DUP + OP_HASH160 + OP_PUSH_20 +
address_to_public_key_hash(private_key.address) +
OP_EQUALVERIFY + OP_CHECKSIG)
scriptCode_len = int_to_varint(len(scriptCode))
to_be_hashed = (version + hashPrevouts + hashSequence + txin.txid +
txin.txindex + scriptCode_len + scriptCode +
txin.amount + SEQUENCE + hashOutputs + lock_time +
hash_type)
hashed = sha256(to_be_hashed) # BIP-143: Used for Bitcoin SV
# signature = private_key.sign(hashed) + b'\x01' sighash ALL ; single b'\x03' ,NONE b'\x02'
if i == 0:
signature = private_key.sign(hashed) + b'\x43'
else:
signature = private_key.sign(hashed) + b'\x42'
script_sig = (len(signature).to_bytes(1, byteorder='little') +
signature + public_key_len + public_key)
inputs[i].script = script_sig
inputs[i].script_len = int_to_varint(len(script_sig))
return {
"version": bytes_to_hex(version),
"input": bytes_to_hex(input_count + construct_input_block(inputs)),
"output": bytes_to_hex(output_block),
"lock_time": bytes_to_hex(lock_time)
}