TRIP: Trajectory-based Recognition of Identity Proof (Revision 02)
Published in IETF Datatracker (Individual Submission), 2026
Abstract
This document specifies the Trajectory-based Recognition of Identity Proof (TRIP) protocol, a decentralized mechanism for establishing claims of physical-world presence through cryptographically signed, spatially quantized location attestations called “breadcrumbs.” Breadcrumbs are chained into an append-only log, bundled into verifiable epochs, and distilled into a Trajectory Identity Token (TIT) that serves as a persistent, privacy-preserving identifier for any authentication layer.
Changes from -01
- Expanded RATS Architecture mapping (RFC 9334) with Verifier trust model
- Active Verification Protocol with challenge-response and CDDL schemas
- Corrected privacy model: quantization-based, not data-locality
- Deterministic CBOR signing (RFC 8949 §4.2), replaced canonical JSON
- H3 resolution range 7–10, default resolution 10
- Sybil Resistance section (replaces unlinkability language)
- Accessibility and Low-Mobility Users section (§15.5)
- Deployment Considerations with multi-Verifier support
Acknowledgements
Revision 02 addresses review feedback from Muhammad Usama Sardar (RATS role mapping, attestation-result replay protection) and Jun Zhang (mobility accessibility concerns).
Links
- IETF Datatracker: draft-ayerbe-trip-protocol
- Source Code: github.com/GNS-Foundation/trip-protocol
- IPR Disclosure: IETF IPR #7153
Recommended citation: Ayerbe Posada, C. (2026). "TRIP: Trajectory-based Recognition of Identity Proof." Internet-Draft draft-ayerbe-trip-protocol-02, IETF.
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