Latest posts of: nathnath5

Hello,

I'm currently trying to understand how to make and sign bitcoin transaction in python using pycryptotool library (https://github.com/primal100/pybitcointools). There's an example explaining how to use this library but I don't quite understand the signing part :

Quote

Code:

> tx = c.mktx(inputs,outs)
> tx
{'locktime': 0, 'version': 1, 'ins': [{'outpoint': {'hash': '3be10a0aaff108766371fd4f4efeabc5b848c61d4aac60db6001464879f07508', 'index': 0}, 'amount': 180000000, 'script': '483045022100fccd16f6....']}
> tx2 = c.sign(tx,0,priv)
> tx2
{'locktime': 0, 'version': 1, 'ins': [{'outpoint': {'hash': '3be10a0aaff108766371fd4f4efeabc5b848c61d4aac60db6001464879f07508', 'index': 0}, 'amount': 180000000, 'script': '483045022100fccd16f619c5f8b8198f5a00f557f6542afaae10b2992733963c5b9c4042544c022041521e7ab2f4b58856e8554c651664af92f6abd58328c41bc652aea460a9a6a30141041f.....']}
> tx3 = c.sign(tx2,1,priv)
> tx3
{'locktime': 0, 'version': 1, 'ins': [{'outpoint': {'hash': '3be10a0aaff108766371fd4f4efeabc5b848c61d4aac60db6001464879f07508', 'index': 0}, 'amount': 180000000, 'script': '483045022100fccd16f619c5f8b8198f5a00f557f6542a...]}
> tx4 = c.serialize(tx)
> tx4
'01000000020875f07948460160db60ac4a1dc648b8c5abfe4e4ffd71637608f1af0a0ae13b000000008b483045022100fccd16f619c5f8b8198f5a00f557f6542afaae10b2992733963c5b9c4042544c022041521e7ab2f4b58856e8554c651664af92f6abd58328c41bc652aea460a9a6a30141041f763d81010db8ba3026fef4ac3dc1ad7ccc....'
> c.pushtx(tx4)

Why is the transaction signed 2 times ? And why is tx serialized and pushed instead of tx2 and tx3 which are signed ?

Thank you in advance for your time and your help,
your fellow beginner,

NathNath