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← How Blockchain Works
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Question
What role does the cryptographic hash of the previous block play in blockchain security?
1
It links each block to its creator's identity, providing accountability for block producers
2
It creates a mathematical chain: altering any historical block changes its hash, which changes all subsequent block hashes, making tampering immediately detectable by the network
3
It encrypts the transactions within each block to prevent unauthorised viewing
4
It provides the computational puzzle that miners must solve to add a new block
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