Description

The contract GivingThanks uses the _mint function to create new ERC721 tokens, which does not check if the recipient is capable of receiving ERC721 tokens.

Instances:

1. Minting to donor (Line 26):

Impact

1. Potential Token Loss:

   • If tokens are minted to a contract that does not implement the onERC721Received function, they could become permanently locked, leading to loss of tokens.

2. Compliance with ERC721 Standard:

   • The ERC721 standard recommends using _safeMint to ensure safe transfers to contracts.

Recommended Mitigation

1. Use _safeMint Function:

   • Replace _mint with _safeMint to include safety checks.

   _safeMint(msg.sender, tokenCounter);

2. Handle Potential Reverts:

   • Be prepared for the possibility that _safeMint may revert if the recipient cannot handle ERC721 tokens.

3. Inform Users:

   • Clearly communicate to users that their addresses must be capable of receiving ERC721 tokens, especially if they are using smart contract wallets.