This is a Solidity contract for whitelisting addresses. It is released under the Unlicense.

• Defines the maximum number of addresses that can be whitelisted
• Mapping of addresses to booleans indicating whether they are whitelisted or not
• Number of addresses currently whitelisted
• Constructor that sets the maximum number of whitelisted addresses
• Function that allows a caller to add their own address to the whitelist, provided that the caller's address has not already been whitelisted and the maximum number of whitelisted addresses has not been reached.

Hardhat is a command-line tool for managing Ethereum development. It helps you set up, test, and deploy your smart contracts on Ethereum networks.

Install Hardhat with npm:

$ npm install hardhat --save-dev

You will also need to install the @nomicfoundation/hardhat-toolbox and dotenv packages as dependencies.

$ npm install @nomicfoundation/hardhat-toolbox dotenv --save-dev

To use Hardhat, you will need to create a configuration file in your project directory. This file should be named hardhat.config.js. You can find more information about configuring Hardhat here.

Once your configuration is set up, you can run Hardhat commands from the command line:

$ npx hardhat <command> [options]

This is a configuration file for the Nomic Foundation Hardhat Toolbox. It includes the necessary code to connect to the Goerli and Mumbai test networks, as well as a private key for authentication.

• @nomicfoundation/hardhat-toolbox
• dotenv
• Environment variables for GOERLI_RPC_URL, MATIC_RPC_URL, and PRIVATE_KEY

The configuration includes the following settings:

• Default network: hardhat
• Solidity version: 0.8.9
• Network settings for Goerli, Mumbai, and Hardhat networks
  • URL for Goerli and Mumbai networks
  • Accounts array with private key for authentication
  • Chain ID for Goerli (5) and Mumbai (80001) networks