Blockchain Consensus Mechanisms BFC Practice Questions (Page 7)

Questions 31–33

1. 31expert · hard

   A central bank is evaluating two blockchain designs for its wholesale payment system. Design A uses a permissioned BFT consensus with 30 nodes, achieving 5,000 TPS with deterministic finality. Design B uses a permissionless PoS consensus with 100,000 validators, achieving 500 TPS with probabilistic finality. The central bank's primary concerns are (1) systemic risk, (2) operational resilience, and (3) compliance with settlement finality regulations. Which design should the central bank choose?

   • ADesign B, because 100,000 validators provide better fault tolerance
   • BDesign B, because permissionless networks are more resilient to attacks
   • CDesign A, because 30 nodes are easier to manage than 100,000 validators
   • DDesign A, because deterministic finality reduces systemic risk and meets regulatory requirements
   Reveal Solution Discussion Select an answer first
2. 32expert · hard

   A government is launching a national digital identity system on a blockchain. The system must be permissioned, with the government as the ultimate authority. It must provide high throughput for identity verification (10,000+ TPS) and deterministic finality. However, there is a political requirement that no single entity, including the government, should be able to unilaterally censor transactions. Which consensus design best meets these conflicting requirements?

   • AA permissionless PoS network with 1 million validators
   • BA single government-operated node using Proof of Authority
   • CA permissioned BFT network with nodes run by multiple government agencies and independent auditors
   • DA permissioned DPoS network with the government as the sole block producer
   Reveal Solution Discussion Select an answer first
3. 33foundation · easy

   In a blockchain-based financial system, what role does consensus play in establishing trust among participants?

   • AIt gives each participant a private key to sign transactions
   • BIt encrypts all communications so that only authorized parties can participate
   • CIt allows participants to trust the integrity of the ledger without needing to trust each other
   • DIt requires all participants to trust a central clearinghouse
   Reveal Solution Discussion Select an answer first