Issue your own governance token

Once your ZK rollup on Bitcoin is up and running, it's common to issue a governance token that can be used for raising funds for future projects and for governing your project's activities as a DAO.

Since your ZK Rollup is EVM-compatible, dApps should be written in Solidity. If you are new to this programming language, please learn more about it here.

The total amount of tokens in circulation can be set to a simple fixed amount or fluctuate based on any programmed ruleset.

Write the governance token issuance smart contract

Extending the OpenZeppelin ERC-20 contract, we create a governance token (BIT) for your Layer 2 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);

Clone the smart contract examples

We've prepared a few different examples for you to get started.

git clone

Compile the contracts

To compile your contracts, use the built-in hardhat compile task.

cd smart-contract-examples
npm install
npx hardhat compile

Deploy the contracts

Review config file hardhat.config.ts. The network configs should look like this.

  networks: {
    mynw: {
      url: "<your ZK rollup RPC url>",
      accounts: {
        mnemonic: "<your mnemonic with funds>"
      timeout: 100_000,
    blockscoutVerify: {
      blockscoutURL: "<your ZK rollup explorer url>",

Run the deploy scripts using hardhat-deploy.

npx hardhat deploy --tags ERC20

Make sure the accounts in hardhat.config.ts have some $BVM.

Interact with the contracts

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 <transfer-amount> --to <your-address>

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