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A blockchain ledger is updated only after the transaction is authenticated by:

AAll the numbers
BAll the names
CAll the notices
DAll the nodes
Answer & Solution
Correct answer: D. All the nodes
1. No single participant can write to the ledger alone. 2. Agreement across the network is required first. 3. The append only ledger is updated only after all the nodes authenticate the transaction. 4. So the answer is all the nodes. _Source: syllabus Computer Science, Ch 3 'Emerging Trends'_
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