Just noticed something practical in the SIGN border control section that the whitepaper completely ignores
the whitepaper outlines border control using Sign Protocol’s on-chain identity infrastructure describing a system where passports are scanned via NFC by extracting data from ICAO 9303-compliant ePassport chips, then cross-referenced against encrypted on-chain identity records for real-time verification.
the model emphasizes cryptographic validation, seamless interoperability, and a privacy-preserving architecture that eliminates the need for cross-border data sharing between sovereign systems.
the system verifies security status by reading the ePassport chip against on-chain encrypted records. instant verification. no data sharing between countries. privacy-preserving.
the part that surprises me: 😲
ICAO 9303 ePassport chips have a real-world failure rate. chips get damaged from physical wear, water exposure, bending, proximity to strong magnetic fields, or manufacturing defects.
border control officers encounter unreadable chips regularly. in traditional border control, an unreadable chip means fallback to visual inspection of the physical document the passport is still valid, the chip failure doesn't invalidate the document.
in SIGN's architecture, if the identity verification depends on reading the NFC chip against on-chain records what is the fallback when the chip fails? the whitepaper describes the system as requiring chip reading for identity verification.
the on-chain verification cannot complete without the chip data. does the border officer fall back to traditional inspection? does the citizen need to get a new passport? .