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ECDSA Node

two ways to allowing user A to send money to user B :

  • User A give his private key to his website, website checks if it's the good private key. not the best way for obvious reasons.
  • User A give a signature, the server verify it's the good signature. more secure way.

Let's do option 2 what do ?

  • Create the message to sign. it contains : Nonce, Amount, Recipient. I've added a module to sign directly to the frontend. Everything in the module is done locally so not a single private key is send to the server.

This project is an example of using a client and server to facilitate transfers between different addresses. Since there is just a single server on the back-end handling transfers, this is clearly very centralized. We won't worry about distributed consensus for this project.

However, something that we would like to incoporate is Public Key Cryptography. By using Elliptic Curve Digital Signatures we can make it so the server only allows transfers that have been signed for by the person who owns the associated address.

Video instructions

For an overview of this project as well as getting started instructions, check out the following video:

https://www.loom.com/share/0d3c74890b8e44a5918c4cacb3f646c4

Client

The client folder contains a react app using vite. To get started, follow these steps:

  1. Open up a terminal in the /client folder
  2. Run npm install to install all the depedencies
  3. Run npm run dev to start the application
  4. Now you should be able to visit the app at http://127.0.0.1:5173/

Server

The server folder contains a node.js server using express. To run the server, follow these steps:

  1. Open a terminal within the /server folder
  2. Run npm install to install all the depedencies
  3. Run node index to start the server

The application should connect to the default server port (3042) automatically!

Hint - Use nodemon instead of node to automatically restart the server on any changes.