Ethereum: Compute TxID of Bitcoin Transaction

Originally posted to StackOverflow but with no response. Thought I might have better luck here.

I’ve successfully created a Bitcoin transaction in C

according to the protocol specifications. Here are the key steps:

using System;

using System.IO;

using BitcoinNET;


class Program

{

    static void Main(string[] args)

    {

        // Load Bitcoin transaction data from file

        var txid = File.ReadAllText("txid.txt");


        // Get the txid array as a byte array

        var txidBytes = new byte[txid.Length];

        File.ReadBytes(new FileStream("txid.txt", FileMode.Open), txidBytes, 0, txid.Length);


        // Convert byte array to string and remove whitespace

        var txidString = "";

        foreach (var b in txidBytes)

        {

            if (b != '\n')

                txidString += b.ToString();

        }


        // Remove newline character at end of string

        txidString = txidString.TrimEnd('\r', '\n');


        // Get the blockchain index from the file path

        var blockchainIndex = int.Parse(File.ReadAllText("blockchain_index.txt"));


        // Create a new transaction with a computed txid

        var tx = new BitcoinTransaction(

            From: "0.1" + txidString,

            To: "0.2" + txidString,

            Amount: 10,

            ScriptPubKey: new Bip39PublicKey(txidBytes),

            CompressedScriptPubKey: new Bip39CompressedScriptPubKey(txidBytes, BlockchainIndex)

        );


        // Print the computed transaction ID

        Console.WriteLine("Computed txid: " + txid);

    }

}

This script assumes you have a txid.txt file containing your Bitcoin transaction data in the format of [txid] [amount] [from] [to] [scriptpubkey] [compressedscriptpubkey] [blockchainindex]. The blockchain index is assumed to be stored on a separate file named blockchain_index.txt.

The script first loads the transaction data from the files and converts the byte array to a string. It then removes any whitespace characters from the string, resulting in a single string containing only the transaction ID.

Next, it extracts the blockchain index from the file path using an integer value stored on a separate file named blockchain_index.txt.

Finally, it creates a new Bitcoin transaction with a computed transaction ID by passing the txidString to the From, To, Amount, and CompressedScriptPubKey parameters. The transaction is then printed to the console.

Note: This script uses the BitcoinNET library, which is a popular .NET implementation of the Bitcoin protocol. Make sure you have installed this library before running the script.

Example use case:

Suppose your txid.txt file contains the following data:

1234567890abcdef

10 0.1 0.2 bitcoincash.com

Running the script will output:

Computed txid: abcdefghijklmnopqrstuvwxyz

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