Building and Scaling dApps with AI and Smart Contracts BBLC Practice Questions (Page 9)

Questions 41–45

1. 41application · medium

   A decentralized marketplace needs to analyze user behavior to provide personalized recommendations. The analysis requires processing large volumes of off-chain data, and the recommendations must be recorded on-chain for transparency. What is the most efficient approach?

   • AProcess user data off-chain with an AI model, then store only the final recommendation and a hash of the input data on-chain.
   • BUse a sidechain to process the data and then send the results to the main chain, but do not record the recommendation itself.
   • CStore all raw user data on-chain and let users query it directly to see how recommendations are generated.
   • DRun the AI model on-chain using a smart contract to process all user data directly.
   Reveal Solution Discussion Select an answer first
2. 42application · medium

   A real estate dApp wants to provide AI-powered property valuation estimates to users. The AI model needs to access historical transaction data from the blockchain and current market trends from external sources. What is the most effective way to integrate this AI capability?

   • AUse a centralized server to collect all data and update the smart contract with the valuation.
   • BHave users manually input market trends into the smart contract for the AI to use.
   • CUse an oracle to fetch external market data and an indexer to get on-chain transaction history, then run the AI model off-chain.
   • DStore the AI model on-chain and have it read data directly from the blockchain and external APIs.
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4. 43foundation · easy

   Which of the following is a common scalability issue in dApps?

   • AInability to store large files on the blockchain
   • BSmart contracts cannot be upgraded, so dApps cannot scale
   • CHigh gas costs and limited transaction throughput on the underlying blockchain
   • DLack of programming languages for dApp development
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5. 44foundation · easy

   How can AI help address scalability issues in dApps?

   • ABy replacing smart contracts with AI models to process transactions
   • BBy predicting network congestion and automatically batching transactions to reduce gas costs
   • CBy storing all dApp data off-chain to reduce on-chain load
   • DBy increasing the block size of the underlying blockchain
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6. 45expert · hard

   A fintech dApp uses an off-chain AI model to approve loans. The smart contract executes the loan only if the AI returns a positive credit score. The team is concerned about adversarial attacks on the AI model. What is the most robust way to mitigate this risk?

   • AAllow the AI model to directly sign the transaction that triggers the loan.
   • BUse a decentralized oracle network to fetch the AI score from multiple independent AI providers and aggregate the results.
   • CEncrypt the AI model and store it on-chain so that no one can tamper with it.
   • DUse a single trusted AI provider and rely on the smart contract to verify the score.
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