ECDSA node

React frontend that communicates with a Node.js server responsible for transferring balances between addresses by creating digital signatures with the appropriate private keys and verifying them on the backend.

It uses the Ethereum Cryptography library, specifically the elliptic curve operations on the curve secp256k1.

Prerequisites

• Node.js version 20+
• pnpm version 10+

Usage

Client (React, Vite, Tailwind CSS)

1. Open the /client folder from terminal.
2. cat .env.example > .env
3. Run pnpm install to install all the dependencies.
4. Run pnpm dev to start the application¹.
5. Visit the application at http://127.0.0.1:5173/.

Server (Express)

1. Open the /server folder from terminal.

2. cat .env.example > .env

3. Run pnpm install to install all the dependencies.

4. Get private key/address pairs by running pnpm generate and copy them into accounts.config.json using the JSON structure below:

   {
     "address_1": {
       "label": "Account 1",
       "balance": 10,
       "privateKey": "privateKey_1"
     },
     "address_2": {
       "label": "Account 2",
       "balance": 20,
       "privateKey": "privateKey_2"
     }
   }
   

5. Run pnpm dev to start the server¹.

Footnotes

1. Alternatively, you can run both the client and server in parallel. Either use pnpm dev in the root directory, or run the task included in .vscode/tasks.json with Ctrl+Shift+P / Cmd+Shift+P > Tasks: Run Task > Start: Client & Server. ↩ ↩²