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Checking if an Ethereum Output Has Been Spent

The underlying Ethereum blockchain ledger provides a way to verify that an output in a transaction has been spent. In this article, we’ll look at how to check if an Ethereum output has been spent using an RPC client.

What is Utxo?

Before we get to the solution, let’s quickly review what a Utxo (Unspent Transaction Output) is. A Utxo represents a transaction that has not yet been spent or finalized and contains all the information necessary to spend it. It consists of:

• txid (Transaction ID)

• vsize (Number of inputs in the transaction)

• nexmints (Number of mints in the transaction, i.e. the amount each output was spent)

• Set of txinrange addresses that are included in the transaction

RPC Client

To perform this check, we will use an RPC client such as Bitcoin-CLI. You can install it on your Ethereum node or download it as a separate tool.

Install bitcoin-cli (on most Linux distributions)
sudo apt-get update && sudo apt-get install bitcoin-cli

On Windows:
git clone 
cd go-ethereum
make.exe build-deps && make.exe release
./release/bin/bitcoin-cli --jsonrpc=1

Example code

Here is an example of using an RPC client to check if the output was released:

import json
def get_transaction_output(tx_hash, index):

Get transaction output from the blockchain
response = bitcoin-cli.gettransactionoutput(tx_hash)

Parse the JSON response
output = json.loads(response['result'])

Check if the output is Utxo and has been spent
utxo = next((o for o in output['outputs'] if o['type'] == 'spend'), None)
if not utxo or utxo['mint'] != index:
return False

If it is a spend, check if the transaction has been completed
txhash = bitcoin_cli.gettransactionoutput(tx_hash)['txid']
response = bitcoin-cli.getblockbynumber(0) 
Get the latest block
block = json.loads(response['result'])
for block in block['blocks']:
for output in block['outputs']:
if output['type'] == 'spend' and utxo['mint'] == index:
return False
return True

Usage example
tx_hash = "0x1234567890abcdef" 
Replace with the actual transaction hash
index = 10 
Replace with the desired spend index (0-indexed)
result = get_transaction_output(tx_hash, index)
print("Output was spent:", result) 
Output: True or False

Conclusion

Checking if an Ethereum output was spent is a key step in understanding how to handle it when using a blockchain. Using an RPC client like Bitcoin-CLI, you can easily check if an output was spent by parsing the JSON response and checking the relevant information.

Be sure to replace the tx_hash and index variables with actual values ​​from your Ethereum transaction or spend. This example uses a simple string approach, but may not cover all edge cases. In real-world scenarios, you’ll likely want to use more robust parsing techniques to handle potential changes in output structure and complexity.

ETHEREUM BLOCKS WAIT VALIDATOR