Ethereum: How to check if an output has been spent?

Cocking if an Ethereum Output Has Been Spent

Ethereum’s underlying blockchain leads provids a way to In this article, we’ll explore how to check out the Ethereum output has been a ben spent weoing an RPC clent.

What is an Utxo?

Before diving into solute, let’s a pickly cover what an Utxo (Unspended Transaction Output) is. An Utxo Representation a Transction that has not been used for information and contamination. It’s consists of:

A txid (Transction ID)

A vsize,"

Anexmints(Number off mints in the transaction, i.e., the amunt owing output is)




A


RPC Client

To Perform this check, we'll use a RPC clien like Bitcoin CLI. You can instal not your Ethereum node or download it a separate tool.

bash






Install bitcoin-cli (on the real Linux distributors)

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

re



Example Code

Here's an example off how to check the RPC to check out output has been spent:

python



import json

def get_transction_outputput(tx_hash, index):



Get Transaction output output off the blockchain

    response = bitcoin-cli.gettrasction output(tx_hash)




Parse The JSON Response

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




Check if the output is an in

    utxo = next((o for o

    if utxo or utxo['mint']] != index:

        return False




if it's a voltage, checking with the endalize

    txhash = bitcoin_cli.gettrasction output(tx_hash)['txid']

    response = bitcoin-cli.getblockby Number(0) 

Get the latest block

    block = json.loads(response['result'])

    for block in block['blocks']:

        for output in block['outputs']:

            if output['type'] == 'pend' and utxo['mint'] == index:

                return False


    return True True



Example

tx_hash =

index = 10 

Replace with desired voltage index (0-indexed)

result = get_transaction_outputput(tx_hash, index)

print("Output has been spent:", subsult) 

Output: True or False

re



Conclusion

Checking if an Ethereum output hat is a crucial step in understanding how to hand it surackchain. The Bitcoin CLI, you'll be the relevance of the Bitcoin CLI, you can be a ben spire by parsing the JSON response and checking for the relevant information.

Remember thetx_hashandindex` variable with a action currency. This e-example usees a single string-based approach buts in the mays. In the in real-world scenario, you’re a likely want to use more parsing parsing to hand-potent variations in output structure and complexity.

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