Smart Contracts and dApp Design for Business BBLC Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A real estate company plans to deploy a dApp for property title registration. They expect high transaction volume during business hours but low volume at night. They want to minimize costs while ensuring availability. What deployment strategy should they choose?

   • ARun a private blockchain with a single node to eliminate gas costs entirely.
   • BDeploy on Ethereum mainnet with a fixed gas price to ensure predictable costs.
   • CDeploy a separate smart contract for each transaction to isolate failures.
   • DUse a Layer 2 solution like a rollup to reduce transaction costs and handle variable throughput.
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A university is creating a dApp for issuing and verifying digital diplomas. Graduates should be able to share their diplomas with employers, who can verify authenticity without needing a blockchain wallet. Which UX design is most appropriate?

   • ARequire employers to install a browser wallet and connect to the dApp to verify diplomas.
   • BUse a private messaging system where graduates must manually confirm each verification request.
   • CProvide a public verification page where anyone can enter a diploma ID and see the verification result.
   • DSend diplomas as PDF files with a QR code that links to the raw transaction data.
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   An insurance company wants to automate claim payouts for flight delays. The smart contract should automatically release funds when a delay is confirmed by an external data source. Which design pattern is most appropriate for this business process?

   • AA pull-based payment pattern where the claimant requests the payout after the delay occurs.
   • BA multi-signature wallet pattern requiring multiple approvals before any payout.
   • CA state machine pattern that manually transitions the claim status through predefined stages.
   • DAn oracle-based pattern that feeds flight delay data into the contract, triggering the payout automatically.
   Reveal Solution Discussion Select an answer first
5. 4expert · hard

   A decentralized exchange (DEX) is planning to launch a new token. They want to prevent a flash loan attack that could manipulate the token price. Which design pattern should they implement?

   • AOwnership pattern to restrict who can trade the token.
   • BUse a price oracle that is resistant to manipulation, such as a time-weighted average price (TWAP) oracle.
   • CEmergency stop pattern to pause trading if an attack is detected.
   • DState machine pattern to limit the token's tradable states.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A bank is building a dApp for corporate clients to manage letters of credit. The clients are not familiar with blockchain technology and expect a traditional banking interface. What is the best UX design approach?

   • ADisplay raw transaction hashes and gas prices on every screen to keep users informed.
   • BProvide a command-line interface for users to execute smart contract functions.
   • CRequire users to manage their own private keys and interact with the smart contract directly through a wallet extension.
   • DBuild a web interface that uses a custodial wallet managed by the bank, abstracting the blockchain interactions behind familiar forms and buttons.
   Reveal Solution Discussion Select an answer first