# Deploy NFT
> This work is inspired by [this blog](https://forum.openzeppelin.com/t/draft-create-an-nft-and-deploy-to-a-public-testnet-using-truffle/2961)
In this tutorial we will create a non-fungible token (NFT) and deploy to a public testnet.
ERC721 is a standard for representing ownership of [non-fungible tokens](https://docs.openzeppelin.com/contracts/3.x/tokens#different-kinds-of-tokens), that is, where each token is unique such as in real estate or collectibles.
We will use [Presets](https://docs.openzeppelin.com/contracts/3.x/api/presets) contracts in [OpenZeppelin Contracts](https://docs.openzeppelin.com/contracts/3.x/) to create an ERC721 and deploy using Truffle.
### Setting up the Environment
We begin by creating a new project.
```
$ mkdir mynft && cd mynft
$ npm init -y
```
Then we install [OpenZeppelin Contracts](https://docs.openzeppelin.com/contracts) which has an implementation of ERC721.
```
$ npm i --save-dev @openzeppelin/contracts
```
Next we install a development tool for deployment, for this tutorial we will use [Truffle](https://www.trufflesuite.com/) but we could use any other tools such as Buidler, Remix or [OpenZeppelin CLI](https://docs.openzeppelin.com/cli).
```
$ npm i truffle
```
### Getting the contract artifacts
We will setup our Solidity project using `truffle init` to create a `contracts` directory and configuration to connect to a network.
```
$ npx truffle init
Starting init...
================
> Copying project files to
Init successful, sweet!
```
We are going to use Preset [`ERC721PresetMinterPauserAutoId`](https://docs.openzeppelin.com/contracts/3.x/api/presets#ERC721PresetMinterPauserAutoId) which is an ERC721 that is preset so it can be minted (with auto token ID and metadata URI), paused and burned.
The Preset contracts have already been compiled, so we only need to copy the artifacts to the `build/contracts` directory.
```
$ mkdir -p build/contracts/
$ cp node_modules/@openzeppelin/contracts/build/contracts/* build/contracts/
```
Using your favorite editor create `2_deploy.js` in the `migrations` directory with the following contents:
```
// migrations/2_deploy.js
// SPDX-License-Identifier: MIT
const ERC721PresetMinterPauserAutoId = artifacts.require("ERC721PresetMinterPauserAutoId");
module.exports = function(deployer) {
deployer.deploy(ERC721PresetMinterPauserAutoId, "My NFT","NFT", "http://my-json-server.typicode.com/huangsuyu/nft/tokens");
};
```
### Deploy the contract to a local blockchain
We will use [`truffle develop`](https://www.trufflesuite.com/docs/truffle/reference/truffle-commands#develop) to open a Truffle console with a development blockchain
* Head over to [Faucet ](https://faucet.ojxscan.com/)and request test OJX
```
$ npx truffle develop
Truffle Develop started at http://127.0.0.1:9545/
Accounts:
(0) 0xc7e4bbc4269fdc62f879834e363173aee7895f45
Private Keys:
(0) ef424b4dc91a9c9d6c1fc4ae0a50ce80668f3a955a7e982584b45577e2c70e27
Mnemonic: mechanic cannon setup general indicate people notable frown poet friend credit true
⚠️ Important ⚠️ : This mnemonic was created for you by Truffle. It is not secure.
Ensure you do not use it on production blockchains, or else you risk losing funds.
truffle(develop)> migrate
Compiling your contracts...
===========================
> Compiling ./contracts/Migrations.sol
> Artifacts written to /Users/Documents/work/mynft/build/contracts
> Compiled successfully using:
- solc: 0.5.16+commit.9c3226ce.Emscripten.clang
Starting migrations...
======================
> Network name: 'develop'
> Network id: 5777
> Block gas limit: 6721975 (0x6691b7)
1_initial_migration.js
======================
Deploying 'Migrations'
----------------------
> transaction hash: 0x9a17a50e6efd52ba3e55245c76c52b065d20587add45aee732c233987033e567
> Blocks: 0 Seconds: 0
> contract address: 0x77409B688eA5461078a31450F3138EA8324F72C9
> block number: 1
> block timestamp: 1604387655
> account: 0xc7e4bBc4269fdC62F879834E363173aeE7895F45
> balance: 99.99616114
> gas used: 191943 (0x2edc7)
> gas price: 20 gwei
> value sent: 0 ETH
> total cost: 0.00383886 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.00383886 ETH
2_deploy.js
===========
Deploying 'ERC721PresetMinterPauserAutoId'
------------------------------------------
> transaction hash: 0xc1a3994c2ad2ba706ac49934b4f480c7b3d9b94241f526afa2dfe91545145a4e
> Blocks: 0 Seconds: 0
> contract address: 0xEaB17D581552123695f03F12b09e378EE9463b44
> block number: 3
> block timestamp: 1604387655
> account: 0xc7e4bBc4269fdC62F879834E363173aeE7895F45
> balance: 99.92142266
> gas used: 3694586 (0x385ffa)
> gas price: 20 gwei
> value sent: 0 ETH
> total cost: 0.07389172 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.07389172 ETH
Summary
=======
> Total deployments: 2
> Final cost: 0.07773058 ETH
truffle(develop)>
```
We can deploy our new NFT to our development blockchain using migrate.
```
truffle(develop)> migrate
Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.
Starting migrations...
======================
> Network name: 'develop'
> Network id: 5777
> Block gas limit: 6721975 (0x6691b7)
1_initial_migration.js
======================
Replacing 'Migrations'
----------------------
> transaction hash: 0x5d71b0a45a0fe20e2ca645393bb44b83fbd47351c009c48be0b8b84b610fb3b7
> Blocks: 0 Seconds: 0
> contract address: 0x3797c825cAC4a1FA765F6D8cd7787fB195849555
> block number: 1
> block timestamp: 1590736865
> account: 0x0445c33BdCe670D57189158b88c0034B579f37cE
> balance: 99.99671674
> gas used: 164163 (0x28143)
> gas price: 20 gwei
> value sent: 0 ETH
> total cost: 0.00328326 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.00328326 ETH
2_deploy.js
===========
Replacing 'ERC721PresetMinterPauserAutoId'
------------------------------------------
> transaction hash: 0x166d7b28f4afb949585b5a0e5b4151daa54acbcb70566b202fd62ab380a6650c
> Blocks: 0 Seconds: 0
> contract address: 0xDEE9411430c7Dd9b67fC6DA723DE729AdAB50AD7
> block number: 3
> block timestamp: 1590736866
> account: 0x0445c33BdCe670D57189158b88c0034B579f37cE
> balance: 99.92191642
> gas used: 3697675 (0x386c0b)
> gas price: 20 gwei
> value sent: 0 ETH
> total cost: 0.0739535 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.0739535 ETH
Summary
=======
> Total deployments: 2
> Final cost: 0.07723676 ETH
```
We can then use our deployed contract.
```
truffle(develop)> nft = await ERC721PresetMinterPauserAutoId.deployed()
undefined
```
### Interact with our Token
The accounts that we can use were displayed when we started `truffle develop`
#### Token metadata
We can call the contract to read token metadata such as `name`, `symbol` and `baseURI`
```
truffle(develop)> await nft.name()
'My NFT'
truffle(develop)> await nft.symbol()
'NFT'
truffle(develop)> await nft.baseURI()
```
#### Mint
We can send a transaction to mint tokens to a given account, from an account with the minter role. In our case we are minting from the account which deployed the token, which is given the minter role.
We will mint 1 NFT with token ID 0.
```
truffle(develop)> await nft.mint("0x0445c33bdce670d57189158b88c0034b579f37ce")
{ tx:
'0xd301a60dbb8ac187687f6639f200d4e6f2cfa065923092b3940330e35a26421d',
receipt:
{ transactionHash:
'0xd301a60dbb8ac187687f6639f200d4e6f2cfa065923092b3940330e35a26421d',
transactionIndex: 0,
blockHash:
'0x3ad3cfcb26da0c969e9d5a5414a5e90a91a3a862c9e9082afc38a0ec0f1a5d00',
blockNumber: 5,
from: '0x0445c33bdce670d57189158b88c0034b579f37ce',
to: '0xdee9411430c7dd9b67fc6da723de729adab50ad7',
gasUsed: 156470,
...
```
We can check the owner of the token and the token URI for the metadata
```
truffle(develop)> await nft.ownerOf(1)
'0x0445c33BdCe670D57189158b88c0034B579f37cE'
truffle(develop)> await nft.tokenURI(1)
```
### MetaData
[EIP-721 2](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md) includes an optional **metadata extension** with a `name`, `symbol` and for each tokenID a `tokenURI` with can point to a JSON file with `name`, `description` and `image` for the given token ID.
How you create and host this metadata is up to you. I would suggest using a domain that you control to point to where you host the data so that you can move it as required.
For this tutorial, we will use [My JSON Server](https://my-json-server.typicode.com/) where we can store a single JSON file in a GitHub repository that we can access via a fake JSON server.
 For production we need to store our metadata in a permanent location that can exist for the life of the token.
A sample JSON for tokenID 1 is:
### Deploy to a public testnet
Next we will deploy to OJX Chain testnet .
To deploy, we will use the instructions for [Connecting to Public Test Networks with Truffle](https://forum.openzeppelin.com/t/connecting-to-public-test-networks-with-truffle/2960)
You will need the following:
* An Infura project ID (or a public node provider of your choice)
* `@truffle/hdwallet-provider` installed
* Configure `truffle-config.js` for Rinkeby network
* A funded testnet account and mnemonic
* A `secrets.json` or another secret-management solution. **Make sure you don’t commit this to GitHub!**
My `truffle-config.js` has the following `rinkeby` configuration:
```
testnet: {
provider: () => new HDWalletProvider(mnemonic, `https://testnet-rpc.ojxscan.com`),
network_id: 97,
confirmations: 10,
timeoutBlocks: 200,
skipDryRun: true
},
nc: {
provider: () => new HDWalletProvider(mnemonic, `https://mainnet-rpc.ojxscan.com`),
network_id: 56,
confirmations: 10,
timeoutBlocks: 200,
skipDryRun: true
},
```
#### Deploy to OJX Testnet
```
$ npx truffle migrate --network testnet
Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.
Starting migrations...
======================
> Network name: 'develop'
> Network id: 5777
> Block gas limit: 6721975 (0x6691b7)
1_initial_migration.js
======================
Deploying 'Migrations'
----------------------
> transaction hash: 0x9a17a50e6efd52ba3e55245c76c52b065d20587add45aee732c233987033e567
> Blocks: 0 Seconds: 0
> contract address: 0x77409B688eA5461078a31450F3138EA8324F72C9
> block number: 1
> block timestamp: 1604387655
> account: 0xc7e4bBc4269fdC62F879834E363173aeE7895F45
> balance: 99.99616114
> gas used: 191943 (0x2edc7)
> gas price: 20 gwei
> value sent: 0 ETH
> total cost: 0.00383886 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.00383886 ETH
2_deploy.js
===========
Deploying 'ERC721PresetMinterPauserAutoId'
------------------------------------------
> transaction hash: 0xc1a3994c2ad2ba706ac49934b4f480c7b3d9b94241f526afa2dfe91545145a4e
> Blocks: 0 Seconds: 0
> contract address: 0xEaB17D581552123695f03F12b09e378EE9463b44
> block number: 3
> block timestamp: 1604387655
> account: 0xc7e4bBc4269fdC62F879834E363173aeE7895F45
> balance: 99.92142266
> gas used: 3694586 (0x385ffa)
> gas price: 20 gwei
> value sent: 0 ETH
> total cost: 0.07389172 ETH
> Saving migration to chain.
> Saving artifacts
-------------------------------------
> Total cost: 0.07389172 ETH
Summary
=======
> Total deployments: 2
> Final cost: 0.07773058 ETH
```
#### Mint
We can send a transaction to mint tokens to a given account, from an account with the minter role.
```
truffle(develop)> nft = await ERC721PresetMinterPauserAutoId.deployed()
undefined
```
In our case we are minting from the account which deployed the token, which is given the minter role.
To see configured accounts run the command `accounts`.
```
truffle(rinkeby)> accounts
[ '0x133d144f52705ceb3f5801b63b9ebccf4102f5ed',
```
We will mint 1 NFT with token ID 1. Specify the address that you want to be the token holder (`0xc7e4bBc4269fdC62F879834E363173aeE7895F45` is one of my test accounts)
```
truffle(rinkeby)> await nft.mint("0x133d144f52705ceb3f5801b63b9ebccf4102f5ed")
{ tx:
'0x0d90d4a2a4ac3f33d5220deb11e8f65adf14a6669afd18abd4cce8ca7ab58e04',
receipt:
{ blockHash: '0x724ba66bc1d799820c05a93ae67991b21bb769fd1e9dddd5db9f725f5f633331',
blockNumber: 3333746,
contractAddress: null,
cumulativeGasUsed: 164785,
from: '0x77737a65c296012c67f8c7f656d1df81827c9541',
gasUsed: 164785,
...
```