ic-nft is a new NFT token standard with full transaction history support, thus all tokens and their metadata are traceable and verifiable.
Open an issue or make a PR if you have any suggestions!
Thank you for sharing.
Apologies if off topic, but reminded me of this. 
Yeah I’m starting to think we need input from DFINITY to make progress on these token standards.
I don’t think Ethereum would’ve got ERC-20 out in the time that it did without Vitalik’s input.
" value = \"a.link/0 " What does it mean or what does it refer to? in
dfx canister --no-wallet call token_ERC721 mint "'($ALICE_PUBLIC_KEY, record { filetype = \"jpg\"; location = variant {IPFS = \"hash0\"}; attributes = vec {record {key = \"url\"; value = \"a.link/0\"}}})'"