Ghost Signature — Ed25519 provenance for AI output

Cryptographically stamp any payload — AI output, document, log line — with Ed25519. Anyone can verify against your public JWKS endpoint. No shared secrets.

• 64-byte signatures, deterministic, ~50µs to sign.
• Public /verify endpoint — consumers of your AI output verify without signing up.
• Soft revocation: old signatures stay valid up to the revocation timestamp; new ones with revoked keys are rejected.
• Hard purge available on Pro for compliance use cases.

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