FREE Blockchain Developer Decentralized Application (dApp) Architecture Questions and Answers Flashcards
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Read the first 6 FREE Blockchain Developer Decentralized Application (dApp) Architecture Questions and Answers flashcards as text
What problem does the event-sourcing pattern solve in dApp architecture?
Answer: It reconstructs application state from a sequence of emitted blockchain events
Event sourcing rebuilds the current application state by replaying the ordered sequence of events emitted by smart contracts, providing a reliable audit trail.
In a multi-chain dApp architecture, what is the role of a cross-chain messaging protocol like LayerZero or Axelar?
Answer: To enable smart contracts on different blockchains to send verified messages to each other
Cross-chain messaging protocols allow contracts on separate blockchains to communicate and verify messages trustlessly, enabling multi-chain application logic.
Which storage approach is most appropriate for large media files referenced by a dApp?
Answer: Using decentralized storage like IPFS or Arweave with on-chain content hashes
Decentralized storage networks handle large files efficiently while content-addressable hashes stored on-chain guarantee data integrity without bloating the blockchain.
What architectural benefit does separating read operations through a dedicated indexer provide to a dApp?
Answer: It decouples query performance from blockchain node throughput
A dedicated indexer processes and caches blockchain data independently, so frontend query speed is not bottlenecked by the blockchain node's processing capacity.
In a gasless transaction architecture using meta-transactions, who ultimately pays the gas fee?
Answer: A relayer service that submits the transaction on behalf of the user
In meta-transaction patterns, a relayer forwards the user's signed message as an on-chain transaction and covers the gas cost, often recouping it through other revenue mechanisms.
Why is a circuit breaker pattern valuable in dApp smart contract architecture?
Answer: It allows an authorized role to pause contract functions during an exploit or emergency
A circuit breaker lets administrators halt critical contract functions immediately when a vulnerability is discovered, limiting potential damage before a fix is deployed.