Proof of Stake (PoS) and Derivative Protocols BDC Practice Questions (Page 9)

Questions 41–45

1. 41application · medium

   A cryptocurrency exchange is evaluating a Proof of Stake network for its staking service. They want to offer customers a product with predictable rewards and low operational risk. The network requires a 30-day lock-up period and has a slashing penalty for validators that go offline. What should the exchange consider before launching the service?

   • AThe exchange should only stake if the reward rate is above 20% annually
   • BThe exchange should avoid staking altogether because slashing always results in total loss of principal
   • CThe exchange must ensure it has enough spare capital to cover potential slashing losses for customers
   • DThe exchange should choose a network with no lock-up period to allow instant withdrawals
   Reveal Solution Discussion Select an answer first
2. 42application · medium

   A Proof of Stake blockchain needs to implement a protocol upgrade that changes the validator selection algorithm. The community is divided. What is the most appropriate governance process in a PoS system?

   • ALet the core developers decide unilaterally and implement the change via a hard fork.
   • BRequire a supermajority of miners to signal support, as in Proof of Work.
   • CUse a lottery among all token holders to select a committee to decide.
   • DHold a stakeholder vote where the weight of each vote is proportional to the amount of stake held or delegated.
   Reveal Solution Discussion Select an answer first
4. 43application · medium

   A DPoS blockchain is experiencing low voter participation, which has resulted in a small group of delegates controlling the network. The team wants to increase decentralization without sacrificing throughput. Which approach is most aligned with DPoS principles?

   • AImplement a vote decay mechanism where older votes lose weight, encouraging token holders to re-vote and stay engaged.
   • BAllow delegates to set their own reward rates without oversight.
   • CSwitch to a pure PoS model where all token holders are validators.
   • DReduce the number of delegates to make each one more accountable.
   Reveal Solution Discussion Select an answer first
5. 44application · medium

   A PoS network is considering allowing validators to withdraw their stake at any time. What is the primary security risk of this design?

   • AThe block time would increase because validators would be less committed.
   • BThe network would be vulnerable to a 51% attack by a miner with high hash power.
   • CValidators could withdraw their stake and then vote on a conflicting fork without penalty, enabling a 'nothing-at-stake' attack.
   • DThe network would become more centralized because only large holders could afford to withdraw.
   Reveal Solution Discussion Select an answer first
6. 45foundation · easy

   What is the primary role of staking in a Proof of Stake (PoS) system?

   • ATo increase the total supply of the cryptocurrency
   • BTo replace the need for a distributed ledger
   • CTo speed up transaction confirmation times
   • DTo provide a financial incentive for validators to act honestly
   Reveal Solution Discussion Select an answer first