Alternative and Hybrid Consensus Mechanisms BDC Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A developer is designing a blockchain for a gaming platform that needs low transaction fees and fast confirmation times, but also wants to prevent a single whale from controlling governance. They decide to use a hybrid consensus that combines proof-of-authority for block production with proof-of-stake for governance voting. What is the main reason to include the proof-of-stake governance layer?

   • ATo increase the block size limit automatically
   • BTo allow token holders to vote on protocol changes and validator behavior
   • CTo eliminate the need for any trusted validators
   • DTo make the network fully permissionless
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A company is building a private blockchain for internal audit trails. They want to use a hybrid consensus that combines proof-of-authority for block production with proof-of-stake for voting on audit rule changes. What is the main reason to include the proof-of-stake voting layer?

   • ATo increase the block production speed
   • BTo eliminate the need for cryptographic hashing
   • CTo make the blockchain publicly accessible
   • DTo allow a broader set of stakeholders to participate in governance decisions
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   Which of the following best describes the hybrid consensus mechanism used by Decred?

   • AA combination of Proof of Work for block production and Proof of Stake for governance and validation
   • BA delegated Proof of Stake system where token holders elect a small set of block producers
   • CA pure Proof of Stake system where all validators are randomly selected from a single pool
   • DA Proof of Authority system where only approved validators can create blocks
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A developer is building a blockchain for a national land registry where the government requires that no single entity can unilaterally alter records, but also demands that transactions finalize within 5 seconds. The system must remain operational even if up to one-third of validators are compromised. Which hybrid consensus mechanism should they choose?

   • AProof-of-Work with 10-minute block time and 6 confirmations
   • BPBFT with a rotating validator set, where validators are selected from multiple government agencies and audited by an independent body
   • CProof-of-Authority with a single government-operated validator
   • DDelegated Proof-of-Stake with 101 elected delegates from the public
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   A blockchain startup wants to launch a public network that is energy-efficient but still resistant to a handful of wealthy actors buying up all the voting power. They are designing a hybrid consensus that uses proof-of-work for block production and proof-of-stake for governance voting. What is the main reason to keep the proof-of-work component in this design?

   • ATo ensure that all transactions are instantly final
   • BTo allow the network to process transactions without any transaction fees
   • CTo make it economically costly for any single entity to dominate block production
   • DTo remove the need for a peer-to-peer network
   Reveal Solution Discussion Select an answer first