Alternative and Hybrid Consensus Mechanisms BDC Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A blockchain project is considering adopting a hybrid consensus similar to Decred. They want to ensure that miners cannot unilaterally change the consensus rules. Which feature of Decred's design directly addresses this concern?

   • AProof-of-stake stakeholders vote on every block, and their votes are required for the block to be accepted
   • BMiners are selected by a lottery based on their coin balance
   • CThe protocol automatically adjusts the block reward every block based on hash rate
   • DA fixed committee of developers has the final say on all protocol changes
   Reveal Solution Discussion Select an answer first
2. 22application · medium

   A developer is studying Decred's hybrid consensus to understand how it prevents miners from censoring transactions. Which mechanism in Decred directly allows stakeholders to override a miner's block?

   • AStakeholders can directly create blocks if they disagree with the miner
   • BThe protocol automatically censors the miner if they censor a transaction
   • CStakeholders vote on each block, and if a block is rejected, the next miner can include the censored transactions
   • DMiners are randomly selected from the stakeholder pool
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A developer is creating a blockchain for a decentralized social media platform where users should be able to post content without permission, but spam prevention requires that posting has some cost. The platform also needs to reward content creators fairly. Which hybrid consensus mechanism aligns with these goals?

   • APure Proof-of-Authority where approved moderators approve every post
   • BProof-of-Burn where users burn tokens to post, with no governance mechanism
   • CPure Proof-of-Stake where only token holders can post
   • DProof-of-Work for posting (small computational cost) combined with Proof-of-Stake for governance and content curation voting
   Reveal Solution Discussion Select an answer first
5. 24application · medium

   A developer is building a blockchain for a decentralized prediction market where users bet on future events. The system needs to be resistant to market manipulation (where a large stakeholder could influence outcomes) and must provide fast settlement. Which hybrid consensus approach best addresses these needs?

   • APoW for block production with PoS for governance where voting power is capped per address to prevent any single entity from dominating decisions
   • BProof-of-Burn where users burn tokens to gain voting power proportional to the amount burned
   • CPure Proof-of-Stake where voting power is proportional to stake, allowing the largest stakeholders to have the most influence
   • DPure Proof-of-Authority where a single trusted entity validates all transactions
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A supply-chain consortium needs a permissioned blockchain that processes 2,000 transactions per second with finality in under 2 seconds, but also wants to periodically anchor data to a public blockchain for auditability. Which hybrid consensus design best fits this requirement?

   • APure Proof-of-Stake with 1-second block times and 6-block confirmation requirement
   • BPBFT within the consortium for fast finality, with periodic state-root commitments published to a public PoW chain
   • CProof-of-Authority with a single validator node for maximum speed
   • DPure Proof-of-Work with a 10-minute block time and probabilistic finality
   Reveal Solution Discussion Select an answer first