Bitcoin Blockchain Architecture BBLC Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A developer is building a blockchain explorer and wants to display the chronological order of Bitcoin blocks. Which property of the blockchain structure allows the explorer to reliably order blocks from oldest to newest?

   • AEach block contains a timestamp that is guaranteed to be strictly increasing and accurate.
   • BEach block contains the hash of the previous block, forming an unbroken chain back to the genesis block.
   • CBlocks are numbered sequentially by the network, and each new block receives the next integer.
   • DThe genesis block contains a list of all future block hashes, allowing direct ordering.
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   What are the two primary incentives for miners to participate in the Bitcoin network?

   • ASubscription fees from users and advertising revenue
   • BInterest on held bitcoins and staking rewards
   • CBlock rewards and transaction fees
   • DDonations from the Bitcoin Foundation and government subsidies
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   What was the primary purpose of Bitcoin as described in its original whitepaper?

   • ATo provide a platform for smart contracts and decentralized applications
   • BTo create a decentralized digital currency that enables peer-to-peer transactions without a central authority
   • CTo establish a permissioned blockchain for enterprise supply chain tracking
   • DTo create a private digital currency controlled by a central bank
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A user loses their smartphone that contains a Bitcoin wallet with a small amount of Bitcoin. The user had written down a 12-word recovery phrase and stored it in a safe. Which statement best describes the user's situation?

   • AThe user can contact the Bitcoin network to recover the private keys from the blockchain.
   • BThe user can use the phone's backup to restore the wallet, but only if the phone is recovered.
   • CThe user cannot recover the Bitcoin because the private keys were stored only on the phone.
   • DThe user can restore the wallet on a new device using the recovery phrase, because the phrase can regenerate the private keys.
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   A new miner joins the Bitcoin network and wants to maximize revenue. The miner has a choice between mining an empty block or including pending transactions. Which strategy is generally more profitable and why?

   • AInclude pending transactions to collect transaction fees in addition to the block reward.
   • BMine an empty block to reduce the risk of including invalid transactions and losing the block reward.
   • CMine an empty block because it requires less computational work and can be found faster.
   • DInclude only high-fee transactions and ignore low-fee ones to reduce block size and improve propagation.
   Reveal Solution Discussion Select an answer first