Create an OP_TRUN transaction using Ethereum with Bitcoin.js
OP_return transactions are a type of non -standard output in etherum, which can be used to sumall quantities of data without for a reference transaction. In this article, we demontrate how to create an op_return transaction using Bitcoin.js, a popular JavaScript Library to interact with the Bitcoins Protocol.
Assumptions
Before continuing, make sure you have installed the required libraries:
`Bash
NPM Install Bitcoinjs-Lib
`
Also, make sure you have a basic understanding of the Ethereum blockchain and its key concepts such as transactions, outputs and addresses.
Create An Op_return Transaction
Here is an example of a scrap of code that shows how to create an op_return transaction with Bitcoin.js:
`Javascript
VAR Bitcoin = Require ('Bitcoinjs-Lib');
var tx = new bitcoin.transaction ();
// Define Input (Who Pays) The Form [Previous Transaction Hash, Output Index]
tx.addinput ({
Previous Transsactionhash: 'Your_previous_Transaction_hash',
Index: 0
}, {{{
Sequencenumber: 1,
Value: 10 // 10 Satoshis
});
// define the data to be sent to output (op_return)
tx.Addoutput ({{
Address: “Youp_return_address”,
Type: “op_return”,
Date: “Your OP_TRUN Transaction Description”
});
In this example we create a new transaction and add two inputs:
- The first entry is an empty transaction that referers to your previously transaction.
- 2. second input Sends 10 Satoshis (0.000001 BTC) to the Recipient’s Address.
Then we define the date to be sent to the output, which is the op_return transaction itself. Here you would describe what you want to serve as a small amount of data.
Generation of Reference Transaction
To create an op_return input that referers to your previously transaction, you must generate a reference transaction. AS FOLLOWS:
`Javascript
// Generate A New Transaction (Output)
var tx = new bitcoin.transaction ();
tx.addinput ({
Previous Transsactionhash: 'Your_previous_Transaction_hash',
Index: 0
}, {{{
Sequencenumber: 1,
Value: 10 // 10 Satoshis
});
// Create a reference transaction that referers to output
tx.Addoutput ({{
Address: “Youp_return_address”,
Type: “op_return”,
Date: “Your OP_TRUN Transaction Description”
}). Addreference ({
Previous transactions: tx.hash (),
Sequencenumber: 2,
Value: 1 // 0.000001 BTC
});
In this example, we generate a new output with address and data. Then we create a reference input that referers to the original output.
Assembly of all this
Now that you have created both inputs (empty transaction and reference transaction), put everything togethering together:
`Javascript
VAR Bitcoin = Require ('Bitcoinjs-Lib');
var tx = new bitcoin.transaction ();
// add the input (who pays) the form [Previous Transaction Hash, Index ...
tx.addinput ({
Previous Transsactionhash: 'Your_previous_Transaction_hash',
Index: 0
}, {{{
Sequencenumber: 1,
Value: 10 // 10 Satoshis
});
// define the data to be sent to output (op_return)
tx.Addoutput ({{
Address: “Youp_return_address”,
Type: “op_return”,
Date: “Your OP_TRUN Transaction Description”
});
Insert Everything In One Function
Here is an example of how you could put everything togethering in one function:
“ Javascript
Createopreurtx Function (renewed) {
VAR Bitcoin = Require (‘Bitcoinjs-Lib’);
Return a new promise ((resoling, action) => {
// Generate A New Transaction (Output)
var tx = new bitcoin.transaction ();
// add the input (who pays) the form [Previous Transaction Hash, Index …
tx.
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