Yes but the owner must execute the edit tx so you will probably never be able to edit all Nfts except if there is very small quantity. Maybe you can see with Tradeport if they can map old_attributes to new_attributes

Yes, it is possible to update or change NFT attributes (traits), but it depends on how the NFT was originally designed in its smart contract. If the contract allows for mutable metadata, and includes proper functions such as updateAttributes() or similar, then you can modify the NFT’s traits even after it's been minted. This kind of flexibility is common in dynamic NFTs, where traits can reflect real-time data or evolve based on user interaction, game logic, or external inputs. Once the on-chain or off-chain metadata is updated, marketplaces like TradePort need to re-index the NFT so that the updated traits are displayed properly. TradePort supports metadata refresh, and as long as the updated metadata follows standard formats and the changes are published to the token URI or via the appropriate APIs, re-indexing should occur without issue.

To do this on-chain, your contract would require a function that looks something like this:

function updateTraits(uint256 tokenId, string memory newTraitData) public {
    require(ownerOf(tokenId) == msg.sender, "Not the owner");
    _tokenTraits[tokenId] = newTraitData;
}

This function allows the NFT owner to send a transaction that updates the metadata tied to their token. Once that's done, you'd typically call TradePort's refresh endpoint or wait for their scheduled crawler to pick up the change.

However, it’s important to note that most NFTs on major networks like Ethereum use immutable metadata, stored permanently on IPFS or Arweave. In those cases, editing traits would require either burning and re-minting the NFT or pointing to a new metadata file if the contract supports it. Dynamic NFTs, such as those used in games, identity systems, or evolving collectibles, are built differently with updatable logic baked into the contract.

For detailed guidance on TradePort indexing and NFT metadata updates, visit: https://docs.tradeport.xyz

Being able to modify NFT traits gives creators more storytelling power and utility, but it must be balanced with transparency, user trust, and on-chain integrity. A well-structured smart contract and a reliable re-indexing method make this process both technically feasible and user-friendly.