Interoperability in Blockchain Systems BFC Practice Questions (Page 2)

Questions 6–10

1. 6expert · hard

   A blockchain architect is designing a cross-chain bridge between a public blockchain and a private consortium blockchain. The consortium requires that only approved validators can participate in the bridge, but the public blockchain is permissionless. The architect is considering a notary scheme with a multi-signature wallet controlled by the consortium. What is the primary governance challenge with this design?

   • AThe consortium cannot legally operate a bridge on a public blockchain
   • BThe public blockchain will not be able to verify the consortium's signatures because they use a different cryptographic algorithm
   • CThe consortium has full control over the bridge, which may conflict with the decentralized ethos of the public blockchain and create a central point of trust
   • DThe multi-signature wallet is not compatible with the public blockchain's smart contract language
   Reveal Solution Discussion Select an answer first
2. 7expert · hard

   A developer is evaluating interoperability protocols for a decentralized finance (DeFi) application that needs to transfer assets between a fast, low-cost sidechain and a highly secure mainnet. The application requires low latency and low transaction fees, but also needs the security guarantees of the mainnet for final settlement. Which protocol design best meets these conflicting requirements?

   • AA notary scheme where a centralized service verifies and relays transfers between the sidechain and mainnet.
   • BA relay chain that requires the sidechain to use the same consensus algorithm as the mainnet.
   • CA sidechain with a federated peg that allows fast transfers but relies on a trusted set of validators.
   • DAn optimistic rollup that batches transactions on the sidechain and posts fraud proofs to the mainnet.
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4. 8application · medium

   A financial institution is using a private blockchain for internal record-keeping and a public blockchain for customer-facing tokenized assets. They want to enable data sharing between the two blockchains without moving assets. Which type of interoperability should they implement?

   • ACross-chain data interoperability using a relay chain to pass messages.
   • BProtocol interoperability using ISO 20022 messages.
   • COff-chain interoperability using APIs to connect the private blockchain to external databases.
   • DOn-chain interoperability by deploying smart contracts on the private blockchain that reference public blockchain data.
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5. 9application · medium

   A fintech startup is building a DeFi lending platform that needs to accept collateral in the form of tokens from multiple different blockchains. The startup wants to provide a unified interface for users to deposit collateral from any supported chain. What is the primary benefit of implementing blockchain interoperability in this application?

   • AIt enables users to deposit collateral from various chains without needing separate accounts on each chain
   • BIt eliminates the need for the startup to maintain its own blockchain
   • CIt guarantees that all tokens will have the same value across chains
   • DIt allows the startup to merge all supported blockchains into a single network
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6. 10foundation · easy

   In a notary scheme for cross-chain communication, what role does the notary play?

   • AIt maintains a sidechain that runs in parallel to the main chain
   • BIt acts as a trusted intermediary that validates and facilitates the transfer of assets between blockchains
   • CIt defines a common standard for all blockchains to follow
   • DIt provides cryptographic proofs to enable trustless atomic swaps
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