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Checking if Ethereum Output Has Been Used

The Ethereum blockchain’s main ledger provides the ability to verify whether a transaction’s output has been issued. In this article, we’ll explore how to check whether an Ethereum output has been issued using an RPC client.

What is Utxo?

Before we dive into the solution, let’s quickly talk about what Utxo (Unspent Transaction Output) is. A “Utxo” means a transaction that has not yet been released or completed and contains all the information needed to release it. It consists of:

• “txid” (transaction identifier)

• “vsize” (number of operating inputs)

• Nexmints (number of operating mints, i.e. the amount from which each production is issued)

• A set of txinrange addresses included in the transaction

RPC Client

To perform this verification, we’ll use an RPC client, such as Bitcoin-CLI. You can install it on your Ethereum node or download it as a standalone tool.

”bash

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

Sample code
Here is an example of how to use an RPC client to check if output has been released:

python

import json file

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 if it has been released

utxo = next((o o in output[‘outputs’], if o[‘type’] == ‘costs’), None)

if not utxo or utxo[‘mint’] != index:

return False

If it is an expense, 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’]:

in output block[‘outputs’]:

if output[‘type’] == ‘costs’ and utxo[‘mint’] == index:

return False

return True

Example usage

tx_hash = “0x1234567890abcdef”

Replace with the actual transaction hash

index = 10

Replace with the desired cost index (indexed 0)

result = get_transaction_output(tx_hash, index)

print(“Output used:”, result)

Output: true or false

“`

Conclusion

Verifying whether Ethereum output has been consumed is a very important step in understanding how to handle it on the blockchain. Using an RPC client like bitcoin-CLI, you can easily verify whether the output was emitted by parsing the JSON response and checking for relevant information.

Remember to replace the tx_hash and index variables with the actual Ethereum transaction or cost values. This example uses a simple string-based approach, but may not cover all edge cases. In real-world scenarios, you will likely want to use more robust parsing techniques to handle possible changes in the structure and complexity of the output.

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