Definition ∞ A Nullifier Hash is a cryptographic output derived from a unique secret, used in privacy-preserving blockchain protocols to prevent double-spending without revealing the underlying transaction details. When a user spends a private asset, they generate a nullifier hash which is then published on the ledger. This hash signals that the asset has been spent, while keeping the original secret and transaction amounts concealed. It provides unlinkability and prevents replay attacks.
Context ∞ Nullifier hashes are central to zero-knowledge privacy solutions, such as those employed in Zcash or other confidential transaction systems. News reports about enhanced privacy features in digital assets often explain how nullifiers enable spending without disclosing sender or receiver identities. The proper generation and management of nullifier hashes are critical for maintaining both privacy and the integrity of the asset supply.
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