Radica Property

The RadicaProperty.sol contract handles the product ownership NFTs. The token ID of the NFT is the certificate ID of the product.

Set Proof

When a product certificate is created, the proofHash relative to that product gets stored in the RadicaProperty contract calling the following function:

function setProof(uint256 tokenId, bytes32 proofHash) public onlyOwner {
    require(_tokenIdToProofHash[tokenId] == 0, "Proof already set");
    _tokenIdToProofHash[tokenId] = proofHash;
}

Claim Property

The owner of a product can claim the ownership of the product by calling the following function when in posses of the proof:

function claimProperty(uint256 tokenId, bytes32 proof) public {
    require(
        _tokenIdToProofHash[tokenId] == keccak256(abi.encode(proof)),
        "Invalid proof"
    );

    string memory uri = string(
        abi.encodePacked(
            "Property of Tag with CertId: ",
            tokenId.toHexString()
        )
    );

    _safeMint(msg.sender, tokenId);
    _setTokenURI(tokenId, uri);
}

Inheritance

The contract inherits from the ERC721 contract and uses the OpenZeppelin library with the ERC721Enumerable and ERC721URIStorage extension. Refer to this link for more details.