CRYPTOCURRENCY

Metamask: Can we sign and send transaction through Metamask on behalf of backend (nodeJs)

Posted on by wear

Event firm through MetamSk in Nodojs

When building a decentralized application (DAPP) with web3.js, the popular JavaScript library interacts with Ethereum blockchain, you must consider how to sign and send events from its front (web application) to the backup node. In this article, we are studying a similar firm of events through Medamk in Nodojs.

What is Metamk?

Metamask is Chrome’s popular extension that allows users to safely administer their Ethereum wallet. It provides a simple way to store and administer private keys, so that it can interact with decentralized applications (DAP) without revealing confidential information. When it comes to signing events through Metamask Nodojs, we focus on the bottom of this process.

Web3.js signing events

If you want to sign events through web3.js, you must create a new web manifestation in the ‘Web3’ library. Then use the ‘signrantation’ method to sign your transaction information.

Here is an example of the end of the code:

`JavaScript

Const web3 = require ('web3');

// Establish the web3 service provider (for example, Infura, MetamSk)

Const a provider = new web3.providers.httpProvider ('

// Create a new web supplier

CONST Web3instance = New Web3 (Service Provider);

// Establish event information

Constacciondata = {

A: '0xsomeaddress', //

Value: '1 ether', // amount of transaction

Gaslimit: '20', // Gas License for Commerce

Chainid: 1, // Red Ethereum (mountains)

};

// Sign your transaction using Web3

Web3instance.Signransaction (Transactionata). Then ((signed transaction) => {

Console.log ('Signed event:', signed transaction);

});

In this example, we create a new example of the "web3" supplier and use it to sign a transaction information object. The "signranation" method returns the signed transaction object, which you can then use to send the event.

Answer the firm through MetamSk

By signing events through Nodejs Metamask, you must delay a background service that can interact with the Ethereum block chain from your forehead (web application). Here are some possible steps:

  • Create a new nodejs server : Establish the new Nodejs server using Express.js or another plot of your choice.

  • Keep the user's private keys safely

    : Keep the user's private keys safely, such as a wallet hardware (for example, Pedger, Trezor) or a safe key, such as Metamk's own application itself of MetamSk.

  • Create the permissions firm : Access access information for each user looking for their private keys from a safe key savings service.

  • Create a new web3 atmosphere: Create a new example of the "Web3" library and establish the Ethereum service provider (for example, Infura, Metamask).

  • SIGNATURE EVENTS SIGNING ACCESS INFORMATION : Use the signature information created to sign the events in the background service.

Here is an example of the end of the code:

` JavaScript

Const express = require (‘express’);

Const app = express ();

Const web3 = require (‘web3’);

// Establish the Ethereum service provider and create signature information

Const a provider = new web3.providers.httpProvider (‘

Const userrivatus = wait fetchuseprivate (); // Look for the user’s private keys from the storage of safe keys

// Create a new expression of web3 and establish the Ethereum Service Supplier

CONST Web3instance = New Web3 (Service Provider);

Consta signedrdrentials = generationingcredits (userprivatic);

// Sign events using signature information

App.post (‘/firm-transaction’, (req, res) => {

Constacciondata = req.body;

Web3instance.Signransaction (Transactionata, signature of firmations). Then ((signed transaction) => {

console.

ETHEREUM SENDING WALLET BALANCE

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