NFT example

omnichain/nft/.eslintignore

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+.yarn
+artifacts
+cache
+coverage
+node_modules
+typechain-types

omnichain/nft/.eslintrc.js

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+const path = require("path");
+
+/**
+ * @type {import("eslint").Linter.Config}
+ */
+module.exports = {
+  env: {
+    browser: false,
+    es2021: true,
+    mocha: true,
+    node: true,
+  },
+  extends: ["plugin:prettier/recommended"],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    ecmaVersion: 12,
+  },
+  plugins: [
+    "@typescript-eslint",
+    "prettier",
+    "simple-import-sort",
+    "sort-keys-fix",
+    "typescript-sort-keys",
+  ],
+  rules: {
+    "@typescript-eslint/sort-type-union-intersection-members": "error",
+    camelcase: "off",
+    "simple-import-sort/exports": "error",
+    "simple-import-sort/imports": "error",
+    "sort-keys-fix/sort-keys-fix": "error",
+    "typescript-sort-keys/interface": "error",
+    "typescript-sort-keys/string-enum": "error",
+  },
+  settings: {
+    "import/parsers": {
+      "@typescript-eslint/parser": [".js", ".jsx", ".ts", ".tsx", ".d.ts"],
+    },
+    "import/resolver": {
+      node: {
+        extensions: [".js", ".jsx", ".ts", ".tsx", ".d.ts"],
+      },
+      typescript: {
+        project: path.join(__dirname, "tsconfig.json"),
+      },
+    },
+  },
+};

omnichain/nft/.gitignore

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+node_modules
+.env
+coverage
+coverage.json
+typechain
+typechain-types
+
+# Hardhat files
+cache
+artifacts
+
+access_token

omnichain/nft/LICENSE

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+MIT License
+
+Copyright (c) 2023 ZetaChain
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

omnichain/nft/README.md

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+# Hardhat Template for ZetaChain
+
+This is a simple Hardhat template that provides a starting point for developing
+smart contract applications on ZetaChain.
+
+## Prerequisites
+
+Before getting started, ensure that you have
+[Node.js](https://nodejs.org/en/download) (version 18 or above) and
+[Yarn](https://yarnpkg.com/) installed on your system.
+
+## Getting Started
+
+To get started, install the necessary dependencies:
+
+```
+yarn
+```
+
+## Hardhat Tasks
+
+This template includes Hardhat tasks that streamline smart contract development.
+Learn more about the template and the functionality it provides
+[in the docs](https://www.zetachain.com/docs/developers/template/).
+
+## Next Steps
+
+To learn more about building decentralized apps on ZetaChain, follow the
+tutorials available in
+[the introduction to ZetaChain](https://www.zetachain.com/docs/developers/overview/).

omnichain/nft/contracts/MyContract.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.7;
+
+import "@zetachain/protocol-contracts/contracts/zevm/SystemContract.sol";
+import "@zetachain/protocol-contracts/contracts/zevm/interfaces/zContract.sol";
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import "@openzeppelin/contracts/utils/Counters.sol";
+import "@zetachain/toolkit/contracts/BytesHelperLib.sol";
+
+contract MyContract is zContract, ERC721 {
+    uint256 constant BITCOIN = 18332;
+    using Counters for Counters.Counter;
+    Counters.Counter private _tokenIdCounter;
+
+    SystemContract public immutable systemContract;
+    mapping(uint256 => uint256) public tokenAmounts;
+    mapping(uint256 => uint256) public tokenChains;
+
+    constructor(address systemContractAddress) ERC721("MyNFT", "MNFT") {
+        systemContract = SystemContract(systemContractAddress);
+    }
+
+    modifier onlySystem() {
+        require(
+            msg.sender == address(systemContract),
+            "Only system contract can call this function"
+        );
+        _;
+    }
+
+    function onCrossChainCall(
+        zContext calldata context,
+        address zrc20,
+        uint256 amount,
+        bytes calldata message
+    ) external override onlySystem {
+        address recipient;
+
+        if (context.chainID == BITCOIN) {
+            recipient = BytesHelperLib.bytesToAddress(message, 0);
+        } else {
+            recipient = abi.decode(message, (address));
+        }
+
+        _mintNFT(recipient, context.chainID, amount);
+    }
+
+    function _mintNFT(
+        address recipient,
+        uint256 chainId,
+        uint256 amount
+    ) private {
+        uint256 tokenId = _tokenIdCounter.current();
+        _safeMint(recipient, tokenId);
+        tokenChains[tokenId] = chainId;
+        tokenAmounts[tokenId] = amount;
+        _tokenIdCounter.increment();
+    }
+
+    function burnNFT(uint256 tokenId, bytes memory recipient) public {
+        require(
+            _isApprovedOrOwner(_msgSender(), tokenId),
+            "Caller is not owner nor approved"
+        );
+        address zrc20 = systemContract.gasCoinZRC20ByChainId(
+            tokenChains[tokenId]
+        );
+
+        (, uint256 gasFee) = IZRC20(zrc20).withdrawGasFee();
+
+        IZRC20(zrc20).approve(zrc20, gasFee);
+        IZRC20(zrc20).withdraw(recipient, tokenAmounts[tokenId] - gasFee);
+
+        _burn(tokenId);
+        delete tokenAmounts[tokenId];
+        delete tokenChains[tokenId];
+    }
+}

omnichain/nft/goldsky.json

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+{
+  "version": "1",
+  "name": "MyContract",
+  "abis": {
+    "MyContract": {
+      "path": "artifacts/contracts/MyContract.sol/MyContract.json"
+    }
+  },
+  "chains": [
+    "zetachain-testnet"
+  ],
+  "instances": [
+    {
+      "abi": "MyContract",
+      "address": "0x3d026bE559797557Fa215f9F7EB4e8BE89fD7d6f",
+      "chain": "zetachain-testnet",
+      "startBlock": 3175521
+    }
+  ]
+}

omnichain/nft/hardhat.config.ts

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+import "./tasks/interact";
+import "./tasks/deploy";
+import "@nomicfoundation/hardhat-toolbox";
+import "@zetachain/toolkit/tasks";
+
+import { getHardhatConfigNetworks } from "@zetachain/networks";
+import { HardhatUserConfig } from "hardhat/config";
+
+const config: HardhatUserConfig = {
+  networks: {
+    ...getHardhatConfigNetworks(),
+  },
+  solidity: "0.8.7",
+};
+
+export default config;

omnichain/nft/package.json

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+{
+  "name": "example-template",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "lint:fix": "npx eslint . --ext .js,.ts --fix",
+    "lint": "npx eslint . --ext .js,.ts"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@ethersproject/abi": "^5.4.7",
+    "@ethersproject/providers": "^5.4.7",
+    "@nomicfoundation/hardhat-chai-matchers": "^1.0.0",
+    "@nomicfoundation/hardhat-network-helpers": "^1.0.0",
+    "@nomicfoundation/hardhat-toolbox": "^2.0.0",
+    "@nomiclabs/hardhat-ethers": "^2.0.0",
+    "@nomiclabs/hardhat-etherscan": "^3.0.0",
+    "@typechain/ethers-v5": "^10.1.0",
+    "@typechain/hardhat": "^6.1.2",
+    "@types/chai": "^4.2.0",
+    "@types/mocha": ">=9.1.0",
+    "@types/node": ">=12.0.0",
+    "@typescript-eslint/eslint-plugin": "^5.59.9",
+    "@typescript-eslint/parser": "^5.59.9",
+    "@zetachain/toolkit": "5.0.0",
+    "axios": "^1.3.6",
+    "chai": "^4.2.0",
+    "dotenv": "^16.0.3",
+    "envfile": "^6.18.0",
+    "eslint": "^8.42.0",
+    "eslint-config-prettier": "^8.8.0",
+    "eslint-import-resolver-typescript": "^3.5.5",
+    "eslint-plugin-import": "^2.27.5",
+    "eslint-plugin-prettier": "^4.2.1",
+    "eslint-plugin-simple-import-sort": "^10.0.0",
+    "eslint-plugin-sort-keys-fix": "^1.1.2",
+    "eslint-plugin-typescript-sort-keys": "^2.3.0",
+    "ethers": "^5.4.7",
+    "hardhat": "^2.14.0",
+    "hardhat-gas-reporter": "^1.0.8",
+    "prettier": "^2.8.8",
+    "solidity-coverage": "^0.8.0",
+    "ts-node": ">=8.0.0",
+    "typechain": "^8.1.0",
+    "typescript": ">=4.5.0"
+  }
+}

omnichain/nft/tasks/deploy.ts

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+import { getAddress } from "@zetachain/protocol-contracts";
+import { task } from "hardhat/config";
+import { HardhatRuntimeEnvironment } from "hardhat/types";
+
+const main = async (args: any, hre: HardhatRuntimeEnvironment) => {
+  if (hre.network.name !== "zeta_testnet") {
+    throw new Error(
+      '🚨 Please use the "zeta_testnet" network to deploy to ZetaChain.'
+    );
+  }
+
+  const [signer] = await hre.ethers.getSigners();
+  if (signer === undefined) {
+    throw new Error(
+      `Wallet not found. Please, run "npx hardhat account --save" or set PRIVATE_KEY env variable (for example, in a .env file)`
+    );
+  }
+
+  const systemContract = getAddress("systemContract", "zeta_testnet");
+
+  const factory = await hre.ethers.getContractFactory("MyContract");
+  const contract = await factory.deploy(systemContract);
+  await contract.deployed();
+
+  if (args.json) {
+    console.log(JSON.stringify(contract));
+  } else {
+    console.log(`🔑 Using account: ${signer.address}
+
+🚀 Successfully deployed contract on ZetaChain.
+📜 Contract address: ${contract.address}
+🌍 Explorer: https://athens3.explorer.zetachain.com/address/${contract.address}
+`);
+  }
+};
+
+task("deploy", "Deploy the contract", main).addFlag(
+  "json",
+  "Output in JSON"
+);

omnichain/nft/tasks/interact.ts

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+import { task } from "hardhat/config";
+import { HardhatRuntimeEnvironment } from "hardhat/types";
+import { parseUnits } from "@ethersproject/units";
+import { getAddress } from "@zetachain/protocol-contracts";
+import ERC20Custody from "@zetachain/protocol-contracts/abi/evm/ERC20Custody.sol/ERC20Custody.json";
+import { prepareData } from "@zetachain/toolkit/helpers";
+import { utils, ethers } from "ethers";
+import ERC20 from "@openzeppelin/contracts/build/contracts/ERC20.json";
+
+const main = async (args: any, hre: HardhatRuntimeEnvironment) => {
+  const [signer] = await hre.ethers.getSigners();
+
+  const data = prepareData(args.contract, ["address"], [args.recipient]);
+
+  let tx;
+
+  if (args.token) {
+    const custodyAddress = getAddress("erc20Custody", hre.network.name as any);
+    const custodyContract = new ethers.Contract(
+      custodyAddress,
+      ERC20Custody.abi,
+      signer
+    );
+    const tokenContract = new ethers.Contract(args.token, ERC20.abi, signer);
+    const decimals = await tokenContract.decimals();
+    const value = parseUnits(args.amount, decimals);
+    const approve = await tokenContract.approve(custodyAddress, value);
+    await approve.wait();
+
+    tx = await custodyContract.deposit(signer.address, args.token, value, data);
+    tx.wait();
+  } else {
+    const value = parseUnits(args.amount, 18);
+    const to = getAddress("tss", hre.network.name as any);
+    tx = await signer.sendTransaction({ data, to, value });
+  }
+
+  if (args.json) {
+    console.log(JSON.stringify(tx, null, 2));
+  } else {
+    console.log(`🔑 Using account: ${signer.address}\n`);
+
+    console.log(`🚀 Successfully broadcasted a token transfer transaction on ${hre.network.name} network.
+📝 Transaction hash: ${tx.hash}
+  `);
+  }
+};
+
+task("interact", "Interact with the contract", main)
+  .addParam("contract", "The address of the withdraw contract on ZetaChain")
+  .addParam("amount", "Amount of tokens to send")
+  .addParam("recipient", "The address of the recipient")
+  .addOptionalParam("token", "The address of the token to send")
+  .addFlag("json", "Output in JSON");