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60 lines
1.9 KiB
60 lines
1.9 KiB
#!/usr/bin/env python
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import sys, hashlib
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from electrum import Interface
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from electrum.bitcoin import Hash, rev_hex, int_to_hex, hash_encode, hash_decode
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"""validate a transaction (SPV)"""
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i = Interface({'server':'ecdsa.org:50002:s'})
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i.start()
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def hash_merkle_root(merkle_s, target_hash, pos):
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h = hash_decode(target_hash)
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for i in range(len(merkle_s)):
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item = merkle_s[i]
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h = Hash( hash_decode(item) + h ) if ((pos >> i) & 1) else Hash( h + hash_decode(item) )
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return hash_encode(h)
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def hash_header(res):
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header = int_to_hex(res.get('version'),4) \
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+ rev_hex(res.get('prev_block_hash')) \
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+ rev_hex(res.get('merkle_root')) \
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+ int_to_hex(int(res.get('timestamp')),4) \
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+ int_to_hex(int(res.get('bits')),4) \
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+ int_to_hex(int(res.get('nonce')),4)
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return rev_hex(Hash(header.decode('hex')).encode('hex'))
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def verify_tx(tx_hash):
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res = i.synchronous_get([ ('blockchain.transaction.get_merkle',[tx_hash]) ])[0]
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raw_tx = i.synchronous_get([ ('blockchain.transaction.get',[tx_hash, res['block_height']]) ])[0]
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assert hash_encode(Hash(raw_tx.decode('hex'))) == tx_hash
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merkle_root = hash_merkle_root(res['merkle'], tx_hash, res['pos'])
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tx_height = res.get('block_height')
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headers_requests = []
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for height in range(tx_height-10,tx_height+10):
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headers_requests.append( ('blockchain.block.get_header',[height]) )
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headers = i.synchronous_get(headers_requests)
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_hash = None
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for header in headers:
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if _hash: assert _hash == header.get('prev_block_hash')
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_hash = hash_header(header)
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height = header.get('block_height')
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if height==tx_height:
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assert header.get('merkle_root') == merkle_root
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print height, _hash, '*'
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else:
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print height, _hash
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try:
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tx = sys.argv[1]
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except:
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tx = '587430e52af2cec98b3fd543083469ffa7a5f5dd2bd569898a7897a64e2eb031'
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verify_tx(tx)
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