EVM ERC-721 Crossmint RBAC Starter

This is an example project to quickly get an NFT contract started. It is only a sample. You will very likely need to modify it to fit your needs. No warranty or guarantee of any sort is included with this SAMPLE software package.

Getting Started

Clone (or fork) this repository

git clone [email protected]:Crossmint/evm-721-crossmint-rbac.git

Install the dependencies

yarn install

Copy the .env file template

cp sample.env .env

Add required environment variables

GOERLI_RPC_URL=
ETHERSCAN_KEY=
MUMBAI_RPC_URL=
POLYGONSCAN_KEY=
PRIVATE_KEY=

1. You can get RPC urls from providers such as https://infura.io/, https://www.alchemy.com/, etc.

2. Get an Etherscan key (to verify your contract) https://info.etherscan.com/etherscan-developer-api-key/

3. Save your public key address to the .env file

4. Export private key from metamask or another wallet. You should not use the same wallet that you store mainnet assets in. Create a new development only metamask account to minimize the risk of storing your private key in plaintext files.

---

Initial adjustments

1. You'll probably want to rename the contract. Change the filename in /contracts/CrossmintTester721.sol to a name of your choosing. Then open that file and change the name there to. For example:

contract CrossmintTester721 is ERC721, AccessControl changes to

contract MyNewName is ERC721, AccessControl

2. Then you'll also need to update the /scripts/deploy.js to reference this new file name. Select all instances of CrossmintTester721 and change to MyNewName (or whatever you set the name to).

3. You will probably want to change the deployed name to by updating the arguments in the constructor on line 26.

Deploy the contract to a testnet

npx hardhat run --network mumbai scripts/deploy.js

Wait about a minute and then verify the Contract. (You'll need an etherscan API key) Note the last parameter is the mumbai USDC token contract we are using for this example. You need to pass that as an argument when you verify. If you changed this value in the deploy.js script you'll need to change this command to match what you put there.

npx hardhat verify --network mumbai 0x__CONTRACT_ADDR_FROM_PREVIOUS_STEP__ 0xFEca406dA9727A25E71e732F9961F680059eF1F9 0x13253aa4Abe1861124d4c286Ee4374cD054D3eb9

0x98339D8C260052B7ad81c28c16C0b98420f2B46a // mumbai USDC token address we use (at time of publishing this repo) 0x13253aa4Abe1861124d4c286Ee4374cD054D3eb9 // crossmint staging treasury (at time of publishing this repo)

---

Now you have a test contract deployed!

Next steps:

• add crossmint support! It's super easy! https://docs.crossmint.io/docs
• there is an example.html file in the /crossmint folder to get you started, just add your staging clientId