Merge pull request #1 from darwinia-network/bear-erc721

ERC721 example

Author: boundless-forest

.gitignore

@@ -1,4 +1,4 @@
-## NPM
 node_modules
-
-token-address.txt
+token-address.txt
+.env
+tokens

erc20/contracts/BootcampERC20.sol

@@ -10,4 +10,3 @@ contract Bootcamp is ERC20 {
         _mint(msg.sender, initialSupply);
     }
 }
-

erc20/scripts/deploy.js

@@ -23,7 +23,7 @@ const deploy = async () => {
 
     // Construct the contract instance
     const contract = new ethers.ContractFactory(abi, bin, wallet);
-
+    
     let initialSupply = ethers.parseUnits("1000"); // Represents 1000 * 10^18
     let res = await contract.deploy(initialSupply);
     let address = await res.getAddress();

erc721/contracts/BootcampERC721.sol

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-3.0
+
+pragma solidity ^0.8.17;
+
+import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
+
+contract Bootcamp is ERC721URIStorage {
+    uint256 public nextTokenId;
+
+    constructor() ERC721("Lesson", "LS") {}
+
+    function mint(address to, string memory tokenURI) public returns (uint256) {
+        uint256 tokenId = nextTokenId++;
+
+        _mint(to, tokenId);
+        _setTokenURI(tokenId, tokenURI);
+
+        return tokenId;
+    }
+}