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Blockchain · Intermediate
10 questions · Question 1 of 10
10%
Multiple Choice
Mid
Why is the blockchain immutable?
A
Altering a single block requires a new signature for every other block that comes after it all the way to the end of the chain.
B
The block mining difficulty is based on the total hashing power of the network, and is adjusted every two weeks to maintain a steady block production rate of 1 block per 10 minutes.
C
Transactions are the things that give a blockchain purpose.
D
A nonce is an abbreviation for "number only used once," which is a number added to a hashed—or encrypted— block in a blockchain that, when rehashed, meets the difficulty level restrictions.
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