HyperLog Trust in Every Entry
Blockchain Pilot Logbook
& Digital Credentials
Infrastructure
JetLink Technologies Ltd
Company No. 17100204
June 2026
HyperLog HyperLog JetLink Technologies Ltd
Company No. 17100204
June 2026
The Problem
Pilot licensing and flight records remain one of the last areas of aviation to resist digital transformation.
Fragmented Logbooks
Pilot logbooks are paper-based or stored in disconnected systems. No single source of truth. Records are subject to loss, damage, and falsification. Nobody signs or verifies logbook entries.
Unverifiable Licences
Pilot licences and medical certificates have no machine-verifiable chain of trust. Cross-border validation requires manual letters between authorities taking weeks.
Slow Hiring
Airlines spend weeks manually cross-referencing pilot hours during recruitment. No standardised mechanism exists for instant, auditable verification of flight experience.
Ramp Check Limitations
Inspectors rely on physical documents and trust without cryptographic proof. No offline digital verification capability exists in production today.
The Regulatory Driver
ICAO is actively establishing digital trust infrastructure for aviation through its SARPs. HyperLog's credential layer is a private sector response to those standards. The logbook layer addresses a gap no existing standard covers.
ICAO Trust Framework
Digital trust infrastructure
Policies, procedures, and technical requirements for organisations to share digital information with confidence in its authenticity and integrity.
Amendment 178 - Annex 1
Global EPL standard
Drives global Electronic Personnel Licensing standards. EASA transposing via NPA 2024-08. Preferred implementation: Verifiable Credentials in a digital wallet per ISO/IEC 18013-5.
HR 2247 - Airmen Certificate Accessibility Act
Passed US House, 24 March 2026
Directs the FAA to accept digital airmen certificates and establish authentication and verification methods by 30 November 2028. Senate companion bill S. 4256 before the Committee on Commerce, Science, and Transportation.
Already live - DGCA India
eGCA: First production EPL system
India's DGCA began issuing production digital CPL and FRTOL licences in February 2025, ATPL from January 2026. The EPL transition is happening. No neutral cross-border verification layer exists between states.
ICAO Use Cases Directly Addressed
Manage Electronic Pilot Licences
A pilot requests a digital licence. Identity is validated via the Trust Framework. A digital credential is created and associated with the pilot's licence.
Ramp Checks
Validation of personnel identity and documentation via digital means, within and between states. Offline verification using cached issuer public keys.
The Solution
Two distinct trust models in one system. Phase 1 delivers digital credentials using standard PKI - no blockchain required. Phase 2 adds the distributed logbook layer, creating the verified evidence base that makes credentials meaningful.
Phase 1 - EPL Credential Layer
Standard public key infrastructure. No blockchain required for credential issuance or verification. Each NAA signs credentials with their private key. Pilots hold in a mobile wallet. Inspectors verify offline against cached public keys.
Aligned with ICAO Amendment 178, Doc 9379, and the ICAO Trust Framework. Ledger-independent by design: simpler, faster to deploy, immediately useful to NAAs.
Phase 2 - Logbook Layer
Flight records involve multiple independent parties: pilot, crew, airline, ATO. No single party should be sole custodian of the audit trail. A permissioned distributed ledger provides multi-party attestation and append-only retention.
No ICAO standard exists for digital logbooks. Ledger technology confirmed during Phase 2 design. Phase 1 delivery is independent of this choice.
The Evidence Layer
Every flight record carries a verification chain showing exactly how it was confirmed. More sources mean higher confidence. The system is transparent about what's verified and what isn't.
Pilot Signed
Cryptographic signature via device biometrics. Permanent on-chain. The pilot's word, backed by PKI.
Crew Corroborated
Other crew members independently log the same flight via QR code sharing. Handles standard and augmented crew operations.
ADS-B Tracked
Flightradar24 and FlightAware via Aireon satellite ADS-B on the Iridium constellation confirm route, times, and altitude. Global coverage including oceanic. Independent of all parties.
Airline OPS Verified
Airline scheduling system confirms the crew were rostered on this flight. Automated integration with crew management systems.
Not every flight achieves all four sources. A private pilot flying their own aircraft may only achieve 1/4 - pilot-signed. A single-pilot commercial operation with ADS-B and rostering can reach 3/4. A two-pilot airline operation with crew corroboration achieves 4/4. Transparency about verification level is a feature, not a limitation.
The Credential Layer
Credentials are issued by regulatory authorities as W3C Verifiable Credentials, signed with the authority's private key. They live on the pilot's device - not on a central server. Verification requires only the issuer's public key, cached on the inspector's device.
Issued by CAA/NAA. Signed with the authority's private key. Cross-border recognisable. Revocation is propagated globally within the configured sync interval.
ICAO Amendment 178 aligned
Signed by an Approved Aviation Medical Examiner. Automated expiry tracking with advance alerts. Airlines see validity status without clinical details.
AME-issued, GDPR-compliant
Issued by ATOs and CAAs after proficiency checks. Each rating is a linked credential with revalidation tracking.
ATO/CAA-issued, linked to logbook evidence
Architecture
The Phase 1 credential layer uses standard PKI - no distributed ledger required. The Phase 2 logbook layer proposes one channel per NAA, each with its own Certificate Authority and Private Data Collections. A shared verification channel enables cross-border credential checks.
Phase 2 - Logbook Layer
NAA-partitioned channels. Private Data Collections for logbook, medical, and training records. Technology TBD during Phase 2 design.
Phase 1 - Credential Layer
Standard PKI. Authority-signed credentials on pilot's device. Offline verification using cached issuer public keys. No distributed ledger required.
Biometric-protected. Never transmitted.
All participating NAA keys cached. No internet needed.
Architecture designed toward ICAO alignment.
Pilot controls data access. Revocable, time-limited.
Use Cases
Ramp Checks
Inspector verifies pilot credentials offline in seconds. Pilot presents via QR or NFC. Inspector's app checks issuer signature against cached public key. No internet required.
Airline Hiring
Pilot grants time-limited, revocable access to their verified logbook. Airline sees the full verification chain - which flights were crew-corroborated, ADS-B tracked, and OPS confirmed.
Cross-Border Recognition
Licence validity verified digitally between states via the shared verification channel. No manual validation letters. No weeks of delay.
Automated Logging
Flights pre-populated from airline rostering systems. ADS-B auto-verifies times. Pilots confirm with one tap instead of manual entry. Augmented crew control times captured via QR sharing.
Medical Tracking
Automated expiry alerts before medical certificate lapses. Airlines always have current validity data. AME signs digital credential directly into the pilot's wallet.
Licence Conversion
New NAA queries verification channel to confirm existing licence. Requests logbook access with pilot's consent to verify hours. Issues new credential. Old records preserved on original channel.
About
JetLink Technologies Ltd is an aviation-native software company. We are not outside observers building for aviation - we are aviation professionals building the tools we know the industry needs.
Christian and Vincent are both active airline pilots and experienced software engineers who have worked together since the development of FlightFile, a flight planning tool used by Norwegian Airlines pilots. With 40 years of combined aviation experience and 20 years of collective software engineering knowledge, they bring frontline operational insight and a shared conviction that aviation deserves better infrastructure.
UK Registered
Company No. 17100204
Current Status
HyperLog is at the design and concept stage. No component is deployed. The architecture described in this document is the proposed system. We are seeking regulatory partnerships and funding to build it.
Now
Design & Research
Architecture design, regulatory alignment analysis, W3C VC schema specification. Grant and public funding pursuit. Early stakeholder engagement with aviation authorities.
Phase 1
EPL Infrastructure
NAA DID registry, VC issuance tooling with photograph, pilot mobile wallet (iOS / Android), inspector offline verification app, revocation service. Technology: React Native, ECDSA P-256, W3C VC Data Model 2.0.
Phase 2
Logbook Layer
Permissioned distributed ledger for flight records. Multi-party attestation by pilot, crew, and airline. Linked to pilot DID from Phase 1. Ledger technology confirmed during Phase 2 design.
Seeking
Regulatory sandbox engagement with NAAs, grant and public funding support, and strategic partnerships to validate the proposed architecture and accelerate Phase 1 development. We are not asking for endorsement - we are beginning a conversation.
We are ready to engage with national aviation authorities, IATA, and aviation stakeholders to shape the future of pilot credentials - aligned with the ICAO Trust Framework.
Technical whitepaper available on request at hyperlog.aero/whitepaper
JetLink Technologies Ltd
Company No. 17100204