Alternative and Hybrid Consensus Mechanisms BDC Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A gaming company wants to launch a blockchain-based in-game currency that must handle 10,000 transactions per second during peak gaming events, but they also want to prevent any single validator from censoring transactions. They have a budget that allows running 100 validator nodes across multiple cloud providers. Which consensus approach best balances these constraints?

   • AProof-of-Authority with 100 validators where any 2 validators can produce a block
   • BProof-of-Work with 1-second block time and 100 mining nodes
   • CProof-of-Stake with a single elected block producer per round and 100 total validators
   • DPractical Byzantine Fault Tolerance (PBFT) with all 100 validators participating in every consensus round
   Reveal Solution Discussion Select an answer first
2. 7expert · hard

   A developer is designing a hybrid consensus for a decentralized file storage network. They want to use proof-of-space for block production and proof-of-stake for governance. The network must be resistant to Sybil attacks and also allow small holders to participate. Which trade-off is most important to address?

   • AProof-of-space requires significant disk space, which may exclude small participants, while proof-of-stake governance may favor large token holders
   • BProof-of-stake governance eliminates the need for proof-of-space
   • CThe hybrid will be less secure than a pure proof-of-stake system
   • DProof-of-space is more energy-efficient than proof-of-stake
   Reveal Solution Discussion Select an answer first
4. 8application · medium

   A blockchain architect is designing a system for a decentralized ride-sharing platform where drivers and riders need to trust the platform's dispute resolution. The platform wants to avoid a single company controlling the rules but also needs to resolve disputes quickly. Which hybrid consensus approach best supports this use case?

   • APoW for transaction processing with PoS for a decentralized arbitration layer where token holders vote on dispute outcomes
   • BPure Proof-of-Authority where the ride-sharing company's validators resolve all disputes
   • CPure Proof-of-Stake where only large token holders can resolve disputes
   • DProof-of-Burn where users burn tokens to become arbitrators
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   A developer is designing a blockchain for a decentralized file storage network where users pay to store files and miners earn tokens for providing storage. The system must prevent miners from cheating by claiming to store files they don't actually have. Which hybrid consensus approach addresses this?

   • APure Proof-of-Stake where miners stake tokens to participate
   • BProof-of-Authority where approved storage providers are trusted
   • CProof-of-Storage (PoSt) where miners must periodically prove they hold the data, combined with PoW for block production
   • DPure Proof-of-Work where miners compete to solve puzzles
   Reveal Solution Discussion Select an answer first
6. 10application · medium

   A logistics company wants to use a hybrid consensus blockchain to track shipments. They need high transaction throughput and low latency, but they also want to ensure that the history cannot be altered by a malicious validator. They are considering a hybrid that uses a BFT protocol with periodic checkpoints to a proof-of-work chain. What is the main reason to include the PoW checkpoints?

   • ATo eliminate the need for digital signatures on transactions
   • BTo provide a tamper-evident anchor that makes historical data more difficult to rewrite
   • CTo increase the transaction throughput of the BFT layer
   • DTo allow the BFT validators to be anonymous
   Reveal Solution Discussion Select an answer first