Commit-Reveal Scheme Design

A commit-reveal scheme is a cryptographic protocol used to ensure fairness in decentralized applications, such as auctions or random number generation, by preventing participants from seeing others actions before they commit to their own. In the first phase, a user submits a hashed version of their data, which hides the actual value while locking them into that specific choice.

Once all participants have submitted their hashes, the protocol enters the reveal phase, where users submit the original data that corresponds to their hash. The system then verifies that the revealed data matches the original hash to ensure no tampering occurred.

This prevents front-running, where a malicious actor might observe a transaction in the mempool and act on that information before the original transaction is finalized. By forcing a commitment before the reveal, the protocol ensures that the outcome cannot be manipulated based on the choices of others.

This mechanism is foundational for fair decentralized derivatives and governance voting. It effectively balances transparency with privacy during the commitment window.

The design relies on the security of cryptographic hash functions to maintain the integrity of the data. It is a critical component for trustless interaction in adversarial environments.