To certify an existing NFT, you must provide the following on-chain information.
Contract Address: The address location of the smart contract that manages the logic for the token.
Token ID: A unique instance of the smart contract
Owner Address: The wallet address of the owner of the NFT
Minting Platform: Where you created your NFT, for example, SuperRare, Rarible, OpenSea or another marketplace. We currently support several minting platforms on the Ethereum blockchain. Select the correct option from the dropdown list. If your minting platform isn't listed, drop us a message and we'll aim to add it.
Where can I find on-chain information?
Look up your NFT listing on OpenSea to get the on-chain information.
Contract Address and Token ID
Find the Contract Address and Token ID under 'Chain Info' on the OpenSea
If the full information is not being displayed and you see an ellipsis, you can find the contract address and token ID by looking at the URL.
After the Contract Address, you'll see a ' /'. The string of letters and numbers that comes after that is the Token ID
For example: opensea.io/assets/ethereum/0xb932a70a57673d89f4acffbe830e8ed7f75fb9e0/20377
Contract address: 0xb932a70a57673d89f4acffbe830e8ed7f75fb9e0
Token ID: 20377
Finding the owner address
To find the owner address ,click the name of the user who owns the work and copy the string of letters and numbers under the name.