Deploying the Contract

To deploy the contract we can go two different routes:

1. We can use the forge create ... command, which is detailed here: https://book.getfoundry.sh/forge/deploying
2. Deployment using a Foundry Script, which is detailed here: https://book.getfoundry.sh/tutorials/solidity-scripting

In our case, I want to create a script, because I personally think its more re-usable. Both things should work equally fine though.

Furthermore, we will need three things to deploy the contract:

1. A private key where the address to that private key is sufficiently funded
2. An RPC endpoint for Polygon to interact with the blockchain
3. Somewhat optional: An polygonscan API Key to verify the contracts

Let's start with the script. Create a new file script/SilverNft.s.sol with the following content:

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import {Script} from "forge-std/Script.sol";
import {SilverOunce} from "../src/SilverNft.sol";

contract MyScript is Script {
    function run() external {
        uint256 deployerPrivateKey = vm.envUint("PRIVATE_KEY");
        vm.startBroadcast(deployerPrivateKey);

        new SilverOunce(
            msg.sender,
            0x110016975ce40F7cB1Dae96a9da51ae1037db3c4, //data provider
            0xfc13Eca5251CDbC1ED703da32c8E3038Da227E24 //oracle entrypoint
        );

        vm.stopBroadcast();
    }
}

Make sure you get the provider and Oracle entrypoint from https://oracle.morpher.com/feeds, because these might change at some point. Before deploying your own contracts, make sure you have the right addresses!

For the Private Key I love to use a tool called vanityeth. Use at your own risk, it just works for me. You can use any private key if you want. Transfer a little bit of POL into the address so deployment works (if you use a test-chain, use that corresponding gas token)

For the API key, go to polygonscan.com then signup/login and copy the API key from the API Key Page

Create a new .env file (in the contracts folder) and fill in the blanks:

RPC_URL=https://...
PRIVATE_KEY=0x123123...
ADDRESS=0x1234...
ETHERSCAN_API_KEY=FROMPOLYGONSCAN

After that its time to deploy the token. Run the following command:

source .env
forge script --chain-id 137 ./script/SilverNft.s.sol --rpc-url ${RPC_URL} --broadcast --verify --sender ${ADDRESS} -vvvv

you will see an output like this:

Deploy Contract using foundry script

And then right away it will try to verify the contract:

Verifying contract on chain

Hint

If, for whatever reason, some of your transactions do not work and the deployment fails in the middle, you can resume the deployment using --resume instead of --broadcast:

forge script --chain-id 137 ./script/SilverNft.s.sol --rpc-url ${RPC_URL} --resume --verify --sender ${ADDRESS} -vvvv

The contract is now deployed, specifically in our screenshot its here: https://polygonscan.com/address/0x8d56087058f75fb8cb402890856962d9ef649188, you can also see the code is verified.

Before interacting with the code from our NextJS app, let's commit the changes to Git:

git add . && git commit -a -m "Added script to deploy the SilverNFT contract"

Next up, lets see how we can interact with our contract from NextJS