Proof of Work (PoW) and Its Variations BDC Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   Which property of a cryptographic hash function is most essential for the mining process in Proof of Work?

   • AAvalanche effect
   • BDeterministic output
   • CCollision resistance
   • DPreimage resistance
   Reveal Solution Discussion Select an answer first
2. 7expert · hard

   A developer must choose a PoW algorithm for a blockchain that will run on a network of low-power IoT devices. The devices have limited memory and CPU. Which algorithm is the most appropriate choice?

   • ARandomX
   • BEquihash
   • CSHA-256
   • DEthash
   Reveal Solution Discussion Select an answer first
4. 8foundation · easy

   In a Proof of Work blockchain, what does a miner actually do to create a new block?

   • AThey randomly select a block from a pool of pending blocks and add it to the chain.
   • BThey solve a cryptographic puzzle by repeatedly hashing block data with different nonces until a hash meets a target condition.
   • CThey collect transactions and send them to a central authority for approval.
   • DThey encrypt the block with a private key and broadcast it to the network.
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   What is the primary design goal of the Equihash algorithm?

   • ATo allow mining on low-power IoT devices.
   • BTo be extremely fast to verify, allowing for very short block times.
   • CTo be memory-hard, making it difficult to create efficient ASICs.
   • DTo be resistant to quantum computing attacks.
   Reveal Solution Discussion Select an answer first
6. 10application · medium

   A startup is choosing a consensus mechanism for a public cryptocurrency. They are concerned about Sybil attacks, where an attacker creates many fake identities to gain control. Which property of PoW directly mitigates this threat?

   • AThe network requires a minimum stake of coins to participate in block production, making Sybil attacks expensive.
   • BThe use of digital signatures ensures that each node has a unique identity that cannot be forged.
   • CThe requirement to expend computational resources to produce blocks makes creating many identities costly, so control is tied to hash power rather than identity count.
   • DThe difficulty adjustment algorithm limits the number of blocks each node can produce per hour.
   Reveal Solution Discussion Select an answer first