Blockchain

Why does presenting my credential to ten verifiers let them silently map my life?

अवसर

Every SD-JWT credential, the dominant format being deployed in EUDI Wallets across EU member states in 2026, carries a single issuer signature that is identical across all presentations. Any two verifiers who receive the same credential can share that token and link both visits to the same person. BBS+ with randomizable signatures prevents this correlation, but it is computationally heavier and production wallet support is thin. An IEEE EuroS&P 2026 paper confirms that issuer-verifier unlinkability is structurally impossible in salted-hash selective disclosure schemes like SD-JWT without issuing fresh credential batches per presentation, an operational burden no major deployment has solved. The hundreds of millions of wallets rolling out under eIDAS 2.0 today will silently correlate holders across every verifier they interact with for the lifetime of the credential.

यह क्यों मायने रखता है

Unlinkable presentation is the primitive that makes selective disclosure mean privacy rather than just granularity, and the dominant deployed format cannot provide it.

मैं अवसर को कैसे आंकता हूं

Opportunity Score मेरा अपना आकलन है, कोई माप नहीं: यह कितना तकलीफदेह है, कितनी बार परेशान करता है, और आज इसे हल करने के लिए कितना कम मौजूद है। जितना ज़्यादा स्कोर, उतना ज़्यादा मुझे लगता है कि इसे बनाना सार्थक है।

गंभीरता8/10

जब यह सामने आता है तो कितनी तकलीफ देता है।

आवृत्ति9/10

लोग वास्तव में कितनी बार इससे टकराते हैं।

व्हाइटस्पेस8/10

आज इसके लिए कितने कम अच्छे टूल मौजूद हैं।