101Blockchain.net - Interactive Blockchain Learning

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Assess your knowledge of blockchain structure and validation

All Quizzes Start Lesson

Question 1

What links blocks together in a blockchain?

Timestamps Each block contains the hash of the previous block Block numbers Transaction data

Question 2

What happens if you modify data in block #5 of a 10-block chain?

Only block #5 becomes invalid Blocks #5 through #10 become invalid The entire chain is deleted Nothing happens

Question 3

What makes blockchain tamper-evident?

Strong passwords Cryptographic linking of blocks Encryption of all data Central authority monitoring

Question 4

Can you secretly modify an old block in a blockchain?

Yes, if you're fast enough No, it would invalidate all subsequent blocks Yes, if you have administrator access Only the most recent block

Question 5

What is a blockchain fork?

When the blockchain is deleted When two valid blocks are found at the same height When a block is invalid When mining stops

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