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- /**
- * """ Check an InputComponent against electrumx service. This can be a bit slow
- since it gets all utxos on that address.
- Returns normally if the check passed. Raises ValidationError if the input is not
- consistent with blockchain (according to server), and raises other exceptions if
- the server times out or gives an unexpected kind of response.
- """
- */
- export default (network, inpcomp) => {
- address = Address.from_pubkey(inpcomp.pubkey)
- prevhash = inpcomp.prev_txid[::-1].hex()
- prevn = inpcomp.prev_index
- sh = address.to_scripthash_hex()
- u = network.synchronous_get(('blockchain.scripthash.listunspent', [sh]), timeout=5)
- for item in u:
- if prevhash == item['tx_hash'] and prevn == item['tx_pos']:
- break
- else:
- raise ValidationError('missing or spent or scriptpubkey mismatch')
- check(item['height'] > 0, 'not confirmed')
- check(item['value'] == inpcomp.amount, 'amount mismatch')
- # Not checked: is it a coinbase? is it matured?
- # A feasible strategy to identify unmatured coinbase is to cache the results
- # of blockchain.transaction.id_from_pos(height, 0) from the last 100 blocks.
- }
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