Question at position 14 What role does blockchain technology play in the Bitcoin system?It connects groups of transactions into blocks that are chained together over time, creating a distributed ledger of all Bitcoin transactions that anyone can access and updateIt ensures all Bitcoin transactions remain secret and are never recorded in a central databaseIt stores user passwords in a centralised bank databaseIt prevents peer-to-peer transactions and requires a central institution to approve transfersClear my selection

Question

BlackTom AI · Accepted Answer

Blockchain links batches of transactions into cryptographically chained blocks, producing a public, distributed ledger of all Bitcoin transactions.

1. Relevant knowledge points and concepts
- Block: a set of validated transactions plus metadata (timestamp, previous block hash, nonce).
- Hash linking: each block includes the hash of the previous block, creating an immutable chain.
- Distributed ledger: every full node keeps a copy of the blockchain; updates occur by network consensus.
- Consensus mechanism: Bitcoin uses Proof-of-Work (miners expend computational effort) to add blocks and decide the canonical chain.
- Transparency vs. privacy: Bitcoin transactions are pseudonymous and visible on the ledger, not secret.

2. Step-by-step reasoning
- Individual transactions are broadcast by users to the network.
- Miners collect transactions into a candidate block and compute a Proof-of-Work (find a nonce such that the block hash meets the difficulty target).
- When a miner finds a valid block, it broadcasts it; other nodes validate all transactions and the proof.
- Validated blocks are appended; because each block references the previous block’s hash, the chain forms and any alteration would require redoing the work for that block and all subsequent blocks.
- All participating nodes can access the ledger and validate its state; new blocks propagate and update everyone’s copy.

3. Calculations
- Not applicable here (no numerical calculation required). Conceptual steps above show how blocks are created and linked.

4. Why the correct answer is correct
- The correct option describes exactly how Bitcoin’s blockchain groups transactions into blocks, chains them via hashes, and creates a distributed ledger that network participants can access and update through consensus.

5. Why the other options are incorrect
- “Ensures all Bitcoin transactions remain secret and are never recorded” is false: transactions are recorded publicly (though addresses are pseudonymous).
- “Stores user passwords in a centralised bank database” is false: there is no central password storage; private keys are held by users.
- “Prevents peer-to-peer transactions and requires a central institution” is false: Bitcoin is designed for peer-to-peer transfers without a central authority.

6. Conclusion
The correct answer is the first option: it connects groups of transactions into chained blocks, creating a distributed ledger that anyone can access and update. This matches the provided answer.

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