Definition ∞ Witness commitment is a cryptographic technique where a party commits to a piece of data, known as a witness, and later reveals it to prove the truth of a statement. This process involves generating a short, fixed-size representation of the witness that can be publicly verified. The commitment ensures that the witness cannot be changed after the initial declaration. It is fundamental for proving knowledge without disclosing the witness itself.
Context ∞ Witness commitment is a core component in various zero-knowledge proof systems, often discussed in the context of privacy and verifiable computation on blockchains. News reports sometimes refer to its role in proving that a transaction is valid without revealing sender, receiver, or amount details. Researchers continue to optimize commitment schemes to ensure their security, efficiency, and resistance to cryptographic attacks, enhancing the privacy features of decentralized applications.
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