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Dev.to
Dev.to
6/17/2026
What actually stays private on Midnight! (A builder's mental model)

What actually stays private on Midnight! (A builder's mental model)

Short summary

Midnight enforces privacy through three concepts: witness data (private), ledger state (public), and explicit disclose() declarations. The compiler prevents accidental data leaks but developers must manually disclose sensitive values and use fresh salts with commitments to prevent brute-force attacks on low-entropy hashes.

  • Privacy is opt-out by default; everything stays private unless explicitly disclosed via disclose()
  • Compiler tracks data provenance through witness derivations to catch hidden information leaks
  • Low-entropy values (votes, booleans) require fresh randomness in commitments to prevent brute-force enumeration

Generated with AI, which can make mistakes.

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