SOST Deal Channels — Encrypted Coordination for Position Trades

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Active Deals

End-to-End Encrypted: All messages are end-to-end encrypted. The relay cannot read content. Only timestamps, message types, and deal metadata are visible. Content is decrypted only by the participating parties.

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Encryption Details

Property	Detail
Key Exchange	X25519 Diffie-Hellman
Message Encryption	XChaCha20-Poly1305
Signing	ED25519 per message
Relay Knowledge	Timestamps and metadata only. Content is opaque to the relay.
Forward Secrecy	Per-session ephemeral keys derived from channel seed
Audit Trail	Signed message hashes recorded. Content not stored by relay.

PRIVACY GUARANTEE

All messages are end-to-end encrypted. The relay cannot read content.

Message types visible on the timeline (offer, accept, cancel, settlement_notice) indicate only the type of coordination step. The actual terms, prices, and identities within messages are encrypted and visible only to the two parties in the deal channel.

For the full E2E protocol specification, see E2E Protocol.