Bitcoin Blockchain Architecture BBLC Practice Questions (Page 9)

Questions 41–43

1. 41expert · hard

   A security researcher is analyzing the feasibility of a 51% attack on Bitcoin. The researcher notes that the attacker would need to control more than half of the network's hash rate. Which factor makes this attack increasingly difficult as the network grows?

   • AThe network would automatically detect the attack and roll back the blockchain to a safe state.
   • BThe difficulty adjustment would automatically increase the block reward to prevent the attack.
   • CThe attacker would need to control more than 90% of the network's hash rate, which is impossible due to hardware constraints.
   • DThe cost of acquiring and operating enough mining hardware to exceed the honest network's hash rate becomes enormous, and the attack would likely be detected by the community, causing a loss of confidence and a drop in Bitcoin's value.
   Reveal Solution Discussion Select an answer first
2. 42application · medium

   A financial journalist writes an article claiming that Bitcoin's creator, Satoshi Nakamoto, can unilaterally change the Bitcoin protocol and control the network. Which response best corrects this misconception?

   • ASatoshi Nakamoto can change the protocol by releasing a new version of Bitcoin Core, and all nodes will automatically update.
   • BSatoshi Nakamoto holds a large portion of Bitcoin and can use that wealth to influence miners to accept changes.
   • CSatoshi Nakamoto's identity is pseudonymous, and the protocol is maintained by a decentralized community of developers and node operators; no single entity can unilaterally change the rules.
   • DSatoshi Nakamoto is a fictional character, and the Bitcoin protocol is controlled by the Bitcoin Foundation.
   Reveal Solution Discussion Select an answer first
3. 43foundation · easy

   Which cryptocurrency was created as a result of a hard fork from Bitcoin in 2017?

   • ARipple
   • BBitcoin Cash
   • CEthereum Classic
   • DLitecoin
   Reveal Solution Discussion Select an answer first