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

Check If Ethereum’s Output Used

The Blockchain Ledger Behind Ethereum sacrifices a way to Ensure Whether the Event is Departure. In this article, we will look at how to check if the ethereum starts is with the rpc client program.

What is Utxo?

Before Diving Into The Solution, It is Quickly Covered, which is Utxo (Unused Event Output). Utxo representents an event that has not yet leg used or finished and contains all the necessary information to use it. IT Consists or:

• A TXID (Event ID)

• A VSIZE (The Number of Income at the Event)

• A Nexmants (Number of Mints at An Event, Ie the Amount Used for Each Output)

• “Txinrang” Addresses Included in The Event

RPC Customer

To complete this check, we use an rpc customer like bitcoin-clli. You can install it in the Ethereum Node or Download It As A Separate Tool.

`Bash

Install Bitcoin-Clli (in Most Linux Distributions)

SUDO APT-Get Update && SUDO APT-Get Install Bitcoin-Clli

On Windows:

Git Clone eithereum.git

CD Go-Ethereum

Make.exe Build -Deps && Make.exe Publication

./Release/bin/bitcoin-cl --- JsonrPC = 1

Example code

Here is an Example of how an rpc customer uses to check if the printed used:

`Python

Bring Json

Def Get_Transaction_Output (TX_HASH, Directory):

Get an event output from the block chain

Answer = Bitcoin-Clli.get transactionoutput (TX_HASH)

Member Json Response

Output = json.lods (Answer ['' result '])

Check if the output is Utxo and Has Been Used

Utxo = Next ((o o Departure ['Departure'], If o ['Type'] == 'Consumes'), Nothing)

If not utxo or utxo ['mint']! = Directory:

Return the Wrong

If it's a consumption, check to see if the event is finished

Txhash = Bitcoin_Cl.get transactionoutput (TX_HASH) ['TXID']

Answer = Bitcoin-Clli.getblockbynumber (0)

Get the latest block

Block = json.loads (answer ['' result '])

Block Block ['Blocks']:

Departure to the Block ['Output']:

If output ['type'] == 'consumes' and utxo ['mint'] == directory:

Return the Wrong

Return the True

Example of Use

TX_hash = "0x1234567890abcdef"

Substitute for a real event

Directory = 10

Replace with the Desired Consumer Index (0-Indexed)

Result = get_transaction_output (tx_hash, directory)

Print ("Departure is Used:" Result)

Output: True or Wrong

Conclusion

Ethereum Output Has Been Used, It is a crucial step to understand how it is handled when using the block chain. Utilizing the Bitcoin-Like RPC Customer Allows you to Easily Check If the Printed Has Been Used by Structuring the Json Response and Checking the Relevant Information.

Be sure to replace the tx_hash and index variables with the actual values ​​of the ethereum event or consumption. This Example Uses A Simple String -Based Approach, But Does Not Necessarily Cover All Cases. In real -world scenarios, you are likely to want to use stronger structuring techniques to deal with potential output variations in the starting structure and complexity.

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