You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
60 lines
1.9 KiB
60 lines
1.9 KiB
#!/usr/bin/env python |
|
|
|
import sys, hashlib |
|
from electrum import Interface |
|
from electrum.bitcoin import Hash, rev_hex, int_to_hex, hash_encode, hash_decode |
|
|
|
"""validate a transaction (SPV)""" |
|
|
|
i = Interface({'server':'ecdsa.org:50002:s'}) |
|
i.start() |
|
|
|
|
|
def hash_merkle_root(merkle_s, target_hash, pos): |
|
h = hash_decode(target_hash) |
|
for i in range(len(merkle_s)): |
|
item = merkle_s[i] |
|
h = Hash( hash_decode(item) + h ) if ((pos >> i) & 1) else Hash( h + hash_decode(item) ) |
|
return hash_encode(h) |
|
|
|
|
|
def hash_header(res): |
|
header = int_to_hex(res.get('version'),4) \ |
|
+ rev_hex(res.get('prev_block_hash')) \ |
|
+ rev_hex(res.get('merkle_root')) \ |
|
+ int_to_hex(int(res.get('timestamp')),4) \ |
|
+ int_to_hex(int(res.get('bits')),4) \ |
|
+ int_to_hex(int(res.get('nonce')),4) |
|
return rev_hex(Hash(header.decode('hex')).encode('hex')) |
|
|
|
|
|
def verify_tx(tx_hash): |
|
|
|
res = i.synchronous_get([ ('blockchain.transaction.get_merkle',[tx_hash]) ])[0] |
|
raw_tx = i.synchronous_get([ ('blockchain.transaction.get',[tx_hash, res['block_height']]) ])[0] |
|
assert hash_encode(Hash(raw_tx.decode('hex'))) == tx_hash |
|
|
|
merkle_root = hash_merkle_root(res['merkle'], tx_hash, res['pos']) |
|
tx_height = res.get('block_height') |
|
headers_requests = [] |
|
for height in range(tx_height-10,tx_height+10): |
|
headers_requests.append( ('blockchain.block.get_header',[height]) ) |
|
headers = i.synchronous_get(headers_requests) |
|
_hash = None |
|
for header in headers: |
|
if _hash: assert _hash == header.get('prev_block_hash') |
|
_hash = hash_header(header) |
|
height = header.get('block_height') |
|
if height==tx_height: |
|
assert header.get('merkle_root') == merkle_root |
|
print height, _hash, '*' |
|
else: |
|
print height, _hash |
|
|
|
try: |
|
tx = sys.argv[1] |
|
except: |
|
tx = '587430e52af2cec98b3fd543083469ffa7a5f5dd2bd569898a7897a64e2eb031' |
|
|
|
verify_tx(tx) |
|
|
|
|