Ethereum Standards and Proposal Processes BDC Practice Questions (Page 7)

Questions 31–35

1. 31expert · hard

   An NFT marketplace is implementing ERC-721 and needs to allow a user to list an NFT for sale. The marketplace contract will hold the NFT during the listing. Which function should the user call first to enable the marketplace to transfer the NFT?

   • AtransferFrom() directly to the marketplace
   • BsafeTransferFrom() to the marketplace
   • CsetApprovalForAll() to the marketplace address
   • Dapprove() on the NFT contract, specifying the marketplace address and token ID
   Reveal Solution Discussion Select an answer first
2. 32application · medium

   A protocol developer wants to propose a change to the Ethereum consensus layer that would alter the block gas limit. They have written a formal proposal. What is the correct first step in the EIP process?

   • ASubmit the proposal as a pull request to the ethereum/EIPs GitHub repository
   • BContact the Ethereum Foundation to request approval
   • CCreate a forum post on Ethereum Magicians to gather feedback before writing the EIP
   • DDeploy a test contract on a testnet to demonstrate the change
   Reveal Solution Discussion Select an answer first
4. 33expert · hard

   An EIP author has received conflicting feedback: some community members want the proposal to be a core protocol change, while others argue it should be an ERC. The author is concerned about the governance path and adoption. What should the author do first?

   • ASplit the proposal into two EIPs: one for the core change and one for the application standard
   • BAbandon the proposal due to lack of consensus
   • CKeep it as a single EIP and let the editors decide its category
   • DSubmit the proposal to the Ethereum Foundation for a ruling
   Reveal Solution Discussion Select an answer first
5. 34application · medium

   An EIP author has submitted a draft proposal for a new token standard. Several community members have suggested changes, and the author has updated the document. What is the next expected step in the EIP lifecycle?

   • AMove the EIP to 'Last Call' for final review
   • BWithdraw the EIP because changes were requested
   • CImmediately mark the EIP as 'Final'
   • DSubmit the EIP to the Ethereum Foundation for approval
   Reveal Solution Discussion Select an answer first
6. 35expert · hard

   A developer is building a multi-asset game and has chosen ERC-1155. They need to ensure that users can safely transfer multiple different token types to a contract that expects to receive them. What should they implement to prevent tokens from being stuck?

   • AUse safeBatchTransferFrom, which checks that the receiving contract implements the ERC-1155TokenReceiver interface
   • BUse safeTransferFrom for each token type individually
   • CUse transferFrom without safety checks to reduce gas
   • DUse the ERC-20 approve and transferFrom pattern for each token ID
   Reveal Solution Discussion Select an answer first