Similar concepts, different jobs
Blockchain comparisons
Compact references for the distinctions learners often blur while moving from intuition to implementation.
Proof of Work vs Proof of Stake
Two ways to make Sybil attacks expensive: burn external energy or put internal capital at risk.
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Public Key vs Address
A public key verifies signatures; an address is a shorter receiving identifier derived from key material.
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Blockchain vs Database
A database optimizes trusted coordination; a blockchain accepts overhead to coordinate without one operator.
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Hashing vs Encryption
Hashing proves integrity without recovery; encryption hides data so an authorized party can recover it.
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