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#!/usr/bin/env python3
# Copyright (C) 2014 The python-bitcoinlib developers
#
# This file is part of python-bitcoinlib.
#
# It is subject to the license terms in the LICENSE file found in the top-level
# directory of this distribution.
#
# No part of python-bitcoinlib, including this file, may be copied, modified,
# propagated, or distributed except according to the terms contained in the
# LICENSE file.
"""Example of timestamping a file via OP_RETURN"""
import bitcoin.rpc
import sys
from bitcoin import params
from bitcoin.core import *
from bitcoin.core.script import *
proxy = bitcoin.rpc.Proxy()
assert len(sys.argv) > 1
digests = []
for f in sys.argv[1:]:
try:
with open(f, 'rb') as fd:
digests.append(Hash(fd.read()))
except FileNotFoundError as exp:
if len(f)/2 in (20, 32):
digests.append(x(f))
else:
raise exp
except IOError as exp:
print(exp, file=sys.stderr)
continue
for digest in digests:
txouts = []
unspent = sorted(proxy.listunspent(0), key=lambda x: hash(x['amount']))
txins = [CTxIn(unspent[-1]['outpoint'])]
value_in = unspent[-1]['amount']
change_addr = proxy.getnewaddress()
change_pubkey = proxy.validateaddress(change_addr)['pubkey']
change_out = CMutableTxOut(params.MAX_MONEY, CScript([change_pubkey, OP_CHECKSIG]))
digest_outs = [CMutableTxOut(0, CScript([OP_RETURN, digest]))]
txouts = [change_out] + digest_outs
tx = CMutableTransaction(txins, txouts)
FEE_PER_BYTE = 0.00025*COIN/1000
while True:
tx.vout[0].nValue = int(value_in - max(len(tx.serialize()) * FEE_PER_BYTE, 0.00011*COIN))
r = proxy.signrawtransaction(tx)
assert r['complete']
tx = r['tx']
if value_in - tx.vout[0].nValue >= len(tx.serialize()) * FEE_PER_BYTE:
print(b2x(tx.serialize()))
print(len(tx.serialize()), 'bytes', file=sys.stderr)
print(b2lx(proxy.sendrawtransaction(tx)))
break
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