Interoperability Challenges in Blockchain Systems BFC Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   What is a common security risk in cross-chain communication?

   • AReduced transaction fees
   • BLoss of private keys due to network latency
   • CIncreased block confirmation time
   • DDouble-spending of assets during the transfer process
   Reveal Solution Discussion Select an answer first
2. 22application · medium

   A developer is building a bridge between a Bitcoin-based network and an Ethereum-based network. The bridge needs to transfer a digital asset from Bitcoin to Ethereum. The developer notices that Bitcoin uses UTXO-based transactions and Ethereum uses account-based transactions. Which technical challenge is the developer most directly facing?

   • AData format inconsistencies, because the transaction models are fundamentally different.
   • BConsensus mechanism differences, because Bitcoin uses proof-of-work and Ethereum uses proof-of-stake.
   • CSecurity risks, because the bridge could be hacked.
   • DScalability issues, because Bitcoin processes fewer transactions per second than Ethereum.
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A developer is building a bridge between a high-throughput blockchain that uses a delegated proof-of-stake (DPoS) consensus and a low-throughput blockchain that uses proof-of-work (PoW). The bridge needs to transfer assets from the DPoS chain to the PoW chain. The developer is concerned about the finality of transactions on the DPoS chain because it uses probabilistic finality. Which technical challenge is the developer most directly facing?

   • AData format inconsistencies because DPoS and PoW use different transaction formats.
   • BSecurity risks because the bridge could be hacked.
   • CScalability issues because the DPoS chain has higher throughput than the PoW chain.
   • DConsensus mechanism differences because DPoS and PoW have different finality guarantees.
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   What is the primary purpose of an atomic swap in blockchain interoperability?

   • ATo exchange assets between two parties on different blockchains without a trusted intermediary
   • BTo merge two blockchains into one
   • CTo create a new cryptocurrency
   • DTo increase the block size of a blockchain
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6. 25expert · hard

   A blockchain interoperability protocol is being designed to connect a high-throughput permissioned blockchain with a slower public blockchain. The protocol must ensure that transactions are not lost or duplicated during the transfer. The team is considering a relay chain with a light client. Which additional mechanism is necessary to address the scalability and data consistency challenges?

   • AA sequencing mechanism that assigns a unique, monotonically increasing nonce to each cross-chain transaction.
   • BA notary scheme that manually verifies each transaction before forwarding.
   • CA checkpointing mechanism that periodically commits the state of the permissioned chain to the public chain.
   • DA transaction batching mechanism that aggregates multiple transactions into a single proof.
   Reveal Solution Discussion Select an answer first