BRC-20: Fungible tokens
The BRC-20 token standard on Bitcoin is similar to ERC-20 on Ethereum. It can represent virtually anything in Bitcoin:
- a cryptocurrency
- a share in a company
- voting rights in a DAO
- a fiat currency like USD
- an ounce of gold
- loyalty points
- and more
Extending the OpenZeppelin ERC-20 contract, we can create a governance token (BIT) for a hypothetical DEX (Bitswap) on Bitcoin.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
contract Bitswap is ERC20 {
constructor(uint256 initialSupply) ERC20("Bitswap", "BIT") {
_mint(msg.sender, initialSupply);
}
}
We've prepared a few different examples for you to get started.
git clone https://github.com/trustlesscomputer/smart-contract-examples.git
To compile your contracts, use the built-in
hardhat compile task.cd smart-contract-examples
npm install
npx hardhat compile
Review config file
hardhat.config.ts. The network configs should look like this. networks: {
mynw: {
url: "http://localhost:10002",
accounts: {
mnemonic: "<your mnemonic with funds>"
},
timeout: 100_000,
},
blockscoutVerify: {
blockscoutURL: "http://localhost:4000", // your explorer URL
...
}
}
Run the deploy scripts using
hardhat-deploy.npx hardhat deploy --tags ERC20
Make sure the accounts in hardhat.config.ts have some TC.
Once the contracts are deployed, you can interact with them. We've prepared a few
hardhat tasks to make it easy for you to interact with the contracts.npx hardhat balanceERC20
npx hardhat transferERC20 --from <your-address> --amount 0.1 --to <your-address>