[{"type":"report","id":"BLC-STUDY-0901","title":"EIP-721 User And Expires And Level Extension","author":[{"literal":"Yan"}],"issued":{"date-parts":[[2022]]},"publisher":"Yan","URL":"https://github.com/ethereum/ERCs/blob/master/ERCS/erc-5334.md","note":"Rights status: Licensed for redistribution. Not a licence to republish the paper."}]