Bitcoin and Bitcoin Blockchain Architecture BDC Practice Questions (Page 7)

Questions 31–35

1. 31foundation · easy

   Which characteristic best describes the Bitcoin blockchain as a distributed ledger?

   • AMultiple nodes each hold a copy of the same transaction history and validate new blocks
   • BEach participant maintains a private ledger that is periodically reconciled
   • CA single authoritative copy of the ledger is stored on a central server
   • DTransactions are recorded only after a central authority approves them
   Reveal Solution Discussion Select an answer first
2. 32application · medium

   A user wants to verify that a transaction they received is confirmed and cannot be easily reversed. Which confirmation metric should the user check?

   • AThe transaction's fee rate.
   • BThe number of blocks mined on top of the block containing the transaction.
   • CThe number of inputs in the transaction.
   • DThe transaction's position in the block.
   Reveal Solution Discussion Select an answer first
4. 33foundation · easy

   Which field is part of a Bitcoin block header?

   • AMerkle root
   • BTransaction signatures
   • CBlock reward amount
   • DUTXO set
   Reveal Solution Discussion Select an answer first
5. 34foundation · easy

   What is the primary role of a full node in the Bitcoin network?

   • ATo route transactions between miners and users without storing the blockchain
   • BTo store only block headers to provide light wallet services
   • CTo validate transactions and blocks and enforce consensus rules
   • DTo mine new blocks by solving Proof of Work puzzles
   Reveal Solution Discussion Select an answer first
6. 35application · medium

   A developer is verifying a Merkle proof for a transaction in a block. The developer has the transaction hash and the Merkle root from the block header. Which additional data is required to complete the proof?

   • AThe previous block's Merkle root.
   • BThe sibling hashes along the path from the transaction to the root.
   • CThe full list of all transactions in the block.
   • DThe block header's nonce and timestamp.
   Reveal Solution Discussion Select an answer first