Architectural and Protocol Innovations BDC Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A developer is designing a blockchain that must process a high volume of transactions but cannot rely on a large number of full nodes due to hardware constraints. They are considering sharding. What is a key challenge they must address to ensure cross-shard transactions are atomic?

   • AEnsuring each shard has its own native token
   • BPreventing validators from participating in multiple shards
   • CStoring all transaction data on the beacon chain
   • DCoordinating a two-phase commit protocol across shards
   Reveal Solution Discussion Select an answer first
2. 22application · medium

   A blockchain project wants to allow users to transact privately while still enabling regulators to audit the total value of transactions in a given period. They are considering using a privacy-preserving technique. Which technique would allow regulators to compute the total transaction volume without seeing individual transaction amounts?

   • AStealth addresses
   • BA sidechain that stores only hashes
   • CHomomorphic encryption
   • DRing signatures
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A blockchain network currently uses a proof-of-work consensus mechanism and is experiencing high energy consumption and low throughput. The team wants to transition to a more energy-efficient mechanism while maintaining a high degree of decentralization. Which consensus mechanism best aligns with these goals?

   • AProof-of-burn (PoB) with coin burning
   • BProof-of-stake (PoS) with a large validator set and randomized block proposal
   • CDelegated proof-of-stake (DPoS) with a small set of elected block producers
   • DProof-of-authority (PoA) with known validators
   Reveal Solution Discussion Select an answer first
5. 24application · medium

   A consortium of banks wants to share transaction data across their permissioned networks without revealing confidential details to non-participating members. They also need to ensure that the shared data is tamper-evident. Which protocol innovation should they adopt?

   • AA sidechain to isolate confidential transactions.
   • BZero-knowledge proofs (ZKPs) to validate transactions without revealing underlying data.
   • CAn interoperability protocol to connect the networks.
   • DSharding to split the network into smaller partitions for privacy.
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A healthcare consortium needs to share patient records across different blockchain networks while ensuring that only authorized parties can view the data. They also want to reduce the risk of a single point of failure in their identity management. Which combination of protocol innovations should they implement?

   • AInteroperability protocol with decentralized identity (DID) and verifiable credentials.
   • BSharding with a centralized identity provider.
   • CLayer-2 rollup with a shared public key infrastructure.
   • DSidechain with a multi-signature wallet.
   Reveal Solution Discussion Select an answer first