Core51 is a corporate messenger for day to day work: decisions, approvals, handoffs, and sensitive discussions. End to end encryption protects confidentiality by default: messages are encrypted on device and the server is treated as untrusted. Only participants can read the content. And if something goes off plan, conversations can be exported with verifiable proof suitable for arbitration, audits, and disputes.
Messages are encrypted on device. The server stores ciphertext and delivery metadata.
TOFU model: keys are pinned on first contact, and changes require explicit re trust.
Security relevant events can be reviewed, including key changes and verification checks.
Sometimes you need a chat to serve as proof of a deal. Core51 supports two simple export models - choose the one that matches your situation.
This is the practical option when you need to act fast: a claim letter, negotiations, mediation, a notary, or other pre-trial steps.
You export an encrypted chat bundle. It stays encrypted until the account owner decides to reveal the private key. After the private key is provided, the bundle can be decrypted and checked.
You need speed and readability: pre-trial letters, settlement talks, negotiation, or mediation.
You need maximum credibility and technical verification: court disputes, expert review, or situations where the other party may claim fabrication.
