Ethereum: How to get addresses from scriptPubKey in segwit transactions?

Scriptpubkey Ethereum scriptpubkey: How to extract them from segwit transactions

As a developer or data analyst who works with Ethereum transactions, you are probably familiar with the Scriptpubkey (SPTK) address concept. These addresses are used in Ethereum transactions and are generated by resolution of complex mathematical puzzles known as “POW), using their own unique cryptographic keys.

However, not all SPTKs can easily be extracted from gross transaction data using standard methods. This is because Segwit transactions, introduced in 2017, use a separate script (known as “scriptsig”) to store metadata and additional parameters for each transaction. The Scriptsig section contains information such as the sender’s public address, subscription scheme and other custom fields.

To overcome this limitation, we will explore some advanced techniques to extract SPTK addresses from Segwit transactions using Ethereum’s script language, Solidity.

Why can’t we simply use scriptpubkey?

In the past, it was possible to extract SPTK addresses directly from gross transaction data, analyzing the scriptsig section. However, with the introduction of Segwit transactions, the additional metadata stored in this section are no longer accessible to Ethereum’s standard tools and libraries.

METHOD 1: Using the eth-sig library

One way to overcome this limitation is to use a third party library called ‘Eth-Sig’. This library provides an API to extract sptk addresses from Segwit transactions. Here is an example of how you can use it:

`JavaScript

Consta {ethsig} = requires (‘eth-sig’);

// Load the transaction data

Consta Txdata = …;

// Extract the scriptsig section

Consta Scriptsig = txdata.scriptsig;

// Analyze scriptsig using the eth-sig library

CONST SIGIINFO = ETHSIG.PARSE (Scriptsig);

// Extract the SPTK address from the subscription scheme

CONST SPKADDRESS = SIGINFO.SPKADDRESS;

console.log (SPKADDRESS);

`

Method 2: Using a custom script

Another approach is to implement a custom script that extracts the SEGWIT transaction SPTK address. This script would need to be compiled and implemented as a solidity contract that can be used in conjunction with the existing code.

Here is an example of how you can implement a custom script:

`Solidity

Pragma solidity ^0.6,0;

SPTKEXTRATOR CONTRACT {

GETSPKADDRESS FUNCTION (Bytes TXDATA MEMORY) PUBLIC VIEW RETURNS (Address) {

// Load the transaction data

Bytes32 txhash = txdata.read (0);

// Analyze the transaction hash as an Ethereum signature

address spkaddress;

Bytes4 [] memory RSP = New Bytes4 [64];

Uint8 [] Memory Sigs = txhash.read (1);

For (Uint256 I = 2; I <65; i ++) {

RSP [i] = Bytes4 (SIGS [I] .byte ());

}

// Extract the SPTK address from the subscription scheme

SPKADDRESS = KECCAK256 (RSP);

Return SPKADDRESS;

}

}

`

Method 3: Using a Library of Third Party and Web3.JS

Finally, you can also use a third party library like Web3.js to extract sptk addresses from Segwit transactions. This method requires more configuration and configuration, but provides access to the necessary libraries and APIs.

Here is an example of how you can use Web3.js with the eth-SIG Library:

`JavaScript

CONST Web3 = Requires (‘Web3’);

Consta {ethsig} = requires (‘eth-sig’);

// Load the web3 instance

CONST Web3instance = new web3.web3 (new web3.providers.httpprovider (‘

// Load the transaction data

Consta Txdata = …;

// Extract the scriptsig section

Consta Scriptsig = txdata.scriptsig;

// Analyze scriptsig using the eth-sig library

CONST SIGINFO = ETHSIG.