Smart Contract Requirements and Architecture BBLC Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A supply-chain consortium plans a smart contract to track product custody transfers. Each member organization has a fixed set of authorized operators, and the contract must prevent unauthorized parties from recording transfers. During requirements elicitation, which requirement should be documented as a non-functional requirement?

   • AOnly operators from member organizations can invoke the recordTransfer function.
   • BThe system must prevent unauthorized access to the recordTransfer function at all times.
   • CThe contract must record the timestamp and operator ID for every custody transfer.
   • DThe contract must emit an event when a custody transfer is recorded.
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A team is deploying a smart contract for a token sale. They anticipate needing to fix bugs after launch. Which upgradeability pattern should they choose to allow changes while preserving the contract's address?

   • AUse a data migration pattern that copies state to a new contract.
   • BDeploy a new contract and migrate all users and data to the new address.
   • CUse a proxy pattern where the proxy delegates calls to an implementation contract that can be replaced.
   • DMake the contract immutable and rely on external off-chain fixes.
   Reveal Solution Discussion Select an answer first
4. 13application · medium

   A team is designing a smart contract that handles user funds. They want to mitigate the risk of a malicious owner stealing funds. Which architectural choice best addresses this concern?

   • AAdd a function that allows the owner to transfer any user's funds directly.
   • BMake the owner a multi-signature wallet that requires approval from multiple trusted parties.
   • CUse a time-lock on all owner functions to give users time to react.
   • DRemove the owner role entirely and make the contract immutable.
   Reveal Solution Discussion Select an answer first
5. 14foundation · easy

   Which element is typically included in a smart contract architecture diagram to show how the contract receives information from the outside world?

   • AA consensus protocol
   • BA mining pool
   • CAn oracle service
   • DA cryptographic hash function
   Reveal Solution Discussion Select an answer first
6. 15foundation · easy

   Which component is used to bring external data, such as a stock price, into a smart contract?

   • AAn oracle
   • BA consensus algorithm
   • CA wallet
   • DA mining pool
   Reveal Solution Discussion Select an answer first