CFA Level I · CFA Level I Exam · Introduction to Digital Assets
An analyst notes that altering a past transaction in a blockchain would require recomputing the hash of that block and every block after it. This property most directly supports the ledger's:
This property supports immutability. Because each block includes the previous block's hash, altering an earlier transaction invalidates every later block and would require recomputing them all and gaining network acceptance. That makes records tamper-resistant, and it says nothing about transaction throughput or privacy.
- Ascalability
- BimmutabilityCorrect
- Cconfidentiality
Explanation
Each block contains the hash of the prior block, so changing one block breaks the chain and forces recalculation of all later blocks, in addition to winning consensus. This makes the record effectively tamper-resistant, which is immutability. It does not make the ledger faster or more private.
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