The Ethereum improvement proposal EIP-6147 has been moved to the final version (Final), which is an extension of ERC-721, which separates the holding and transfer rights of NFT and soul-bound tokens (SBT), and defines a new role, that is, guard (expiration time can be set). The flexibility of guard settings makes it possible to design NFT anti-theft, NFT lending, NFT leasing, SBT, etc. Ethereum EIP needs to go through the stages of conception, draft, review, and Last Call before reaching the Final state. Any EIP in draft or review that has been inactive for 6 months or more will be moved to Inactive status.