[{"type":"report","id":"BLC-STUDY-0456","title":"Guard of NFT/SBT, an Extension of ERC-721","author":[{"literal":"5660-eth"},{"literal":"Wizard Wang"}],"issued":{"date-parts":[[2022]]},"publisher":"5660-eth , Wizard Wang","URL":"https://eips.ethereum.org/EIPS/eip-6147","note":"Rights status: Official external source only. Not a licence to republish the paper."}]