protocol-overview.md

Protocol Overview

GBV evaluates whether independently observed surfaces can represent one coherent state.

Stage Mapping

1. Stage I: challenge issuance (/api/gbv/init).
2. Stage II: multi-surface collection in a normal browser context.
3. Stage III: nonce/structure and semantic invariant verification.
4. Stage IV: deterministic canonicalization of observed data.
5. Stage V: commitment and signed receipt generation.

Key Properties

• Verification is server-authoritative.
• Decisions derive from observed evidence and protocol checks.
• No privileged provider APIs are required.
• The extension can display full server protocol metadata without violating blindness.

Outcome Model

• ok: true + accepted: true indicates coherent evidence.
• ok: false with structured error code indicates invariant/protocol failure.
• Raw response payload remains available for exact inspection.