def helloblock_fetchtx(txhash, network="btc"):
if isinstance(txhash, list):
return [helloblock_fetchtx(h) for h in txhash]
if not re.match("^[0-9a-fA-F]*$", txhash):
txhash = txhash.encode("hex")
if network == "testnet":
url = "https://testnet.helloblock.io/v1/transactions/"
elif network == "btc":
url = "https://mainnet.helloblock.io/v1/transactions/"
else:
raise Exception("Unsupported network {0} for helloblock_fetchtx".format(network))
data = json.loads(make_request(url + txhash).decode("utf-8"))["data"]["transaction"]
o = {"locktime": data["locktime"], "version": data["version"], "ins": [], "outs": []}
for inp in data["inputs"]:
o["ins"].append(
{
"script": inp["scriptSig"],
"outpoint": {"index": inp["prevTxoutIndex"], "hash": inp["prevTxHash"]},
"sequence": 4294967295,
}
)
for outp in data["outputs"]:
o["outs"].append({"value": outp["value"], "script": outp["scriptPubKey"]})
from bitcoin.transaction import serialize
from bitcoin.transaction import txhash as TXHASH
tx = serialize(o)
assert TXHASH(tx) == txhash
return tx
def helloblock_fetchtx(txhash, network='btc'):
if not re.match('^[0-9a-fA-F]*$', txhash):
txhash = safe_hexlify(txhash)
if network == 'testnet':
url = 'https://testnet.helloblock.io/v1/transactions/'
elif network == 'btc':
url = 'https://mainnet.helloblock.io/v1/transactions/'
else:
raise Exception('Unsupported network {0} for helloblock_fetchtx'.format(network))
data = request(url + txhash)["data"]["transaction"]
o = {
"locktime": data["locktime"],
"version": data["version"],
"ins": [],
"outs": []
}
for inp in data["inputs"]:
o["ins"].append({
"script": inp["scriptSig"],
"outpoint": {
"index": inp["prevTxoutIndex"],
"hash": inp["prevTxHash"],
},
"sequence": 4294967295
})
for outp in data["outputs"]:
o["outs"].append({
"value": outp["value"],
"script": outp["scriptPubKey"]
})
from bitcoin.transaction import serialize
from bitcoin.transaction import txhash as TXHASH
tx = serialize(o)
assert TXHASH(tx) == txhash
return tx
def build_unsigned_single_tx(amount, fees, outputs):
'''
Builds an unsigned tx and returns it in a list
'''
txs = build_valid_single_tx(amount, fees, outputs)
txjson = deserialize(txs[0])
for inp in txjson["ins"]: inp['script'] = ''
return [serialize(txjson)]
o["ins"].append({
"script": inp["scriptSig"],
"outpoint": {
"index": inp["prevTxoutIndex"],
"hash": inp["prevTxHash"],
},
"sequence": 4294967295
})
for outp in data["outputs"]:
o["outs"].append({
"value": outp["value"],
"script": outp["scriptPubKey"]
})
from bitcoin.transaction import serialize
from bitcoin.transaction import txhash as TXHASH
tx = serialize(o)
assert TXHASH(tx) == txhash
return tx
def webbtc_fetchtx(txhash, network='btc'):
if not re.match('^[0-9a-fA-F]*$', txhash):
txhash = safe_hexlify(txhash)
if network == 'testnet':
webbtc_url = 'http://test.webbtc.com/tx/'
elif network == 'btc':
webbtc_url = 'http://webbtc.com/tx/'
else:
raise Exception('Unsupported network {0} for webbtc_fetchtx'.format(network))
hexdata = make_request(webbtc_url + txhash + ".hex")
return st(hexdata)
'sequence': UINT_MAX
}],
'outs': [{
'script': opReturnScript,
'value': 0
}, {
'script': lockScriptChangeAddr,
'value': amount
}],
'locktime':
0,
'version':
1
}
rawMainTX = bitcoinlibtransaction.serialize(mainTX)
## uncomment the next 3 lines if need to debug the transaction
# deserializedRawMainTX = bitcoinlibtransaction.deserialize(rawMainTX)
# print(deserializedRawMainTX)
# print("\n")
#
# sign raw transaction
#
signedRawMainTX = rpc._call(
"signrawtransaction", rawMainTX
) # I directly call the rpc method instead of using the lib rpc.signrawtransaction function as that function is expecting a transaction object. For the sake of the exercise, I construct the transaction manually. There are other methods to make the transaction, for instance: https://github.com/petertodd/python-bitcoinlib/blob/master/examples/spend-p2pkh-txout.py
#
