Ethereum: How to get the Input Address from vin where only a txid is given (Insight-Api)

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Ethereum: How to Extract Input Address and Amount from VIN

Wen’s interstanding the VIN (Unique Identification Number) is a crocal for accurate information. In this article, we’ll delve into how to extract the Input Address and Amount from a given VIN.

VIN Structure*

A VIN consists of several components:

txid: The transaction ID

vout: The output index

n: The number of inputs (optional)

и: The index of an input (optional)

In yourour example, the VIN is:

`json



"vin": [

    {

        "txid": "e3f088888888899c189c1b99c1b9d2fd2fd2fd488bda2f303dbe1e1e1e1e1e1dbea1dbbaa51d9f4a53a",

        "vout": 1,

        "n": 1, // No inputs

        "i": 0 // Input index (optional)

    }

]



Extraction Input Address and Amount


To extract the Input Address and Amount from a VIN, you can canvin' object's properties. Here's how to do it:


`javascript

function vinToData(vin) {

  const inputIndex = vin.vout; // Get theput index (Input Index)

  const txid = vin.txid;

  const amount = vin.i ? vin[i + 1] : null; // Get the first Amount i is not -1


  return {

    txid,

    vut: index, // Remove the index from the VIN

    amount,

    inputs: vin.inputs.map((input) => ({

      txid: input.txid,

      amount: input.amouunt,

      n: input.n,

      i: input.i,

    }))

  };

}

This function assumes that the vinobedi the aniproperty for the Amount, and if it does not, it returnsnull. The VIN'svoutis used to get the Input Index.



Example Usage


Let's say you has a transaction with

json



"vin": [

  {

    "txid": "e3f088888888899c189c1b99c1b9d2fd2fd2fd488bda2f303dbe1e1e1e1e1e1dbea1dbbaa51d9f4a53a",

    "vout": 1,

    ...


You can through thevinToDatafunction to extract the Input Address and Amount:

javascript

const vin = {

  txid: "e3f08888888899c189c1b99c1b9d2fd2fd2fd48bda2f303dbe1e1e1e1e1e1e1e1dbbaa51d9f4a53

  vout: 1,

  i: 0

};


const data = vinToData(vin);

console.log(data); // Output: { txid, vout, ammunt, inputs }



In this example, the output will obso ob the obsress:

txid: The transaction ID

voout: The Input Index (1)

mount: The Amount associated with the input

inputs: An ary of objects containing:

+txid: The transaction ID of the input

+mount: The amount of the input

+n: The number of inputs

+и`: The index of the input (if it’s not -1)

This is a basic example, and you can need to modeify Additional, keep in thatthy information is true on, available if the tranceion, mined on the Ethereum Mainnet or EIP-1559 Network.

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