Proof of Stake (PoS) and Derivative Protocols BDC Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A developer is designing a new PoS blockchain and wants to minimize the risk of a 'long-range attack' where an attacker tries to rewrite history from a point far in the past. Which strategy is most effective?

   • AKeep the block time very short to make the chain longer and harder to rewrite.
   • BRely on the community to manually reject any rewritten chain.
   • CUse periodic checkpointing where finalized blocks are signed by a committee and cannot be reverted.
   • DRequire validators to stake a large amount, but allow them to withdraw at any time.
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   In a Proof of Stake (PoS) blockchain, what primarily determines a validator's chance of being selected to propose the next block?

   • AThe amount of cryptocurrency the validator has locked up as collateral
   • BThe validator's computational hash rate relative to the network
   • CThe number of transactions the validator has previously processed
   • DThe validator's geographic proximity to other nodes
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   In Proof of Stake systems, how are protocol upgrades typically decided?

   • ABy a random selection of validators who decide without community input
   • BThrough on-chain governance where stakeholders vote on proposals
   • CBy miners signaling support through hash power
   • DBy a central development team that unilaterally implements changes
   Reveal Solution Discussion Select an answer first
5. 19expert · hard

   A PoS network is planning a major upgrade that will change the token economics, potentially reducing the rewards for large validators. A group of large validators is threatening to fork the network if the upgrade passes. The upgrade has the support of a majority of small token holders. What is the most likely outcome in a well-designed PoS governance system?

   • AThe upgrade is blocked because large validators can veto any change.
   • BThe upgrade passes if it receives the required supermajority of stake-weighted votes, and the minority fork will likely lose value.
   • CThe network splits into two equal-value chains, and users can choose which to use.
   • DThe upgrade is automatically rejected because it reduces rewards for large validators.
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   In Delegated Proof of Stake (DPoS), how are block producers typically chosen?

   • AToken holders vote for a small set of delegates who are responsible for producing blocks
   • BThe node with the most computational power produces all blocks
   • CA random lottery selects a new producer for each block from all stakers
   • DAll token holders take turns producing blocks in a round-robin fashion
   Reveal Solution Discussion Select an answer first