2. Deploying Smart Contract

You can use Remix Online IDE or use truffle to deploy above MyERC721Card smart contract.

2.1 Deploying smart contract using Remix Online IDE

• Please visit Klaytn Plugin for Remix and create a MyERC721Card contract. The complete source code is given at Writing ERC-721 Smart Contract.

• Create an account to deploy the contract with.

  • If you do not have an account yet, create one at https://baobab.wallet.klaytn.foundation/create or https://toolkit.klaytn.foundation/account/accountKeyLegacy.

  • Get some test KLAY from the faucet - https://baobab.wallet.klaytn.foundation/faucet

• Let's deploy MyERC721Card.sol as below.

ERC721-1-deploy

Now MyERC721Card is live! You can mint and transfer cards which are ERC-721 compatible non-fungible tokens.

Let's mint two cards, i.e. King and Queen cards, for account 0x2645BA5Be42FfEe907ca8e9d88f6Ee6dAd8c1410 as below.

ERC721-2-mint-king

ERC721-3-mint-queen

Now we have minted two cards and let's check the status of these MyERC721Card non-fungible token.

ERC721-4-cards-status

• balanceOf shows that account 0x2645BA5Be42FfEe907ca8e9d88f6Ee6dAd8c1410 has two cards.

• cards with parameter 1 shows that MyERC721Card with token ID 1 is a Queen of level 1.

• ownerOf with parameter 0 shows that owner of MyERC721Card with token ID 0 is 0x2645BA5Be42FfEe907ca8e9d88f6Ee6dAd8c1410.

2.2 Deploying smart contract using truffle

You should have installed node.js in your environment. Please take a look at Installing Node.js via package manager to install node.js using package manager in various environment.

$ mkdir klaytn
$ cd klaytn
$ npm init # initialize npm at the erc20token directory
$ npm install truffle@4.1.15
$ npm install caver-js@latest # installing caver-js
$ ln -s node_modules/truffle/build/cli.bundled.js truffle
$ export PATH=`pwd`:$PATH

Now you have installed truffle and caver-js which are required to deploy smart contracts.

Let's prepare truffle and a smart contract MyERC721Card.sol.

$ mkdir myerc721
$ cd myerc721
$ truffle init

Now you will have following directory structures.

.
├── contracts
│   ├── Migrations.sol
├── migrations
│   └── 1_initial_migration.js
└── truffle-config.js

After write MyERC721Card.sol and locate it to contracts directory, directory structure will be as follows.

Now you will have following directory structures.

.
├── contracts
│   ├── Migrations.sol
│   └── MyERC721Card.sol
├── migrations
│   └── 1_initial_migration.js
└── truffle-config.js

Also, edit 1_initial_migration.js as shown below to deploy the MyERC721Card contract.

const Migrations = artifacts.require("./Migrations.sol");
const MyERC721Card = artifacts.require("./MyERC721Card.sol");
module.exports = function(deployer) {
  deployer.deploy(Migrations);
  deployer.deploy(MyERC721Card)
};

You also have to configure truffle-config.js to deploy the smart contract to Klaytn network. This is the same step described at Deploying a Smart Contract using Truffle

// truffle-config.js
module.exports = {
    networks: {
        baobab: {
            host: '127.0.0.1',
            port: 8551,
            from: '0xabcdabcdabcdabcdabcdabcdabcdabcdabcdabcd', // enter your account address
            network_id: '1001', // Baobab network id
            gas: 20000000, // transaction gas limit
            gasPrice: 250000000000, // gasPrice of Baobab is 250 ston
        },
    },
    compilers: {
      solc: {
        version: "0.5.12"    // Specify compiler's version to 0.5.12
      }
  }
};

Now you are all ready, let's deploy MyERC721Card.sol using the following command.

$ truffle deploy --network baobab --reset
Compiling ./contracts/MyERC721Card.sol...
Writing artifacts to ./build/contracts

Using network 'baobab'.

Running migration: 1_initial_migration.js
  Replacing Migrations...
  ... 0x5a947f076f4570dff8ff18b1ae3557e27dd69c92ce38a3c97fad8f5355914066
  Migrations: 0x0d737e9865e5fc4c1ff53744fd2c13c52a44b9bc
  Deploying MyERC721Card...
  ... 0x1571e80552dab1d67260e8914e06d9b16ccae16fb698c750f6a09aab12517bc1
  MyERC721Card: 0xc3d282926871c505f334d0f2c85ad52758347831
Saving successful migration to network...
  ... 0x5b984b3f79c425d80470a96d5badb857fc05e7f31d94423044ae3119c639aa77
Saving artifacts...

The console output shows that the transaction hash for deploying MyERC721Card is 0x1571e80552dab1d67260e8914e06d9b16ccae16fb698c750f6a09aab12517bc1 and the address of MyERC721Card is 0xc3d282926871c505f334d0f2c85ad52758347831.