Plain English
A Merkle proof is a sequence of hashes that proves a specific piece of data is part of a Merkle tree, without revealing the rest of the tree. Used in airdrops, light clients, bridges, and rollup state proofs. Small, cheap to verify, mathematically certain.
How it actually works
Given a root hash and a target leaf, the proof is the chain of sibling hashes from leaf to root. The verifier rehashes the leaf with each sibling in sequence and confirms the final result equals the root. If it does, the leaf is verifiably part of the tree. Tampering with anything would change the root.
What it means for you
When claiming an airdrop, the contract uses a Merkle proof to verify your eligibility against a published root — the entire eligibility list never has to live on-chain. The HNW takeaway is recognizing this pattern: Merkle proofs are how huge data sets become provable in tiny on-chain footprints. Recognize it and you understand a large chunk of crypto infrastructure.
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