What is zero-trust proof-of-presence?

It's on-device crypto binding GPS, time, and file hashes into tamper-proof certs, with servers only verifying—no originals exposed.

How does Flutter handle large file encryption?

Via Dart Isolates with compute(): hashes and AES-GCM run off UI thread, writing directly to disk to dodge memory spikes.

Can anyone verify QRPruf proofs without the app?

Yes—pure Dart verifier checks canonical hashes offline, no network or platform ties needed.

🔒 Security & Privacy

Proving Presence with Crypto: A Flutter App That Locks Down Judicial Proofs

What if a simple QR code could cryptographically prove you stood at a doorstep, serving papers, unalterable forever? One dev just built it for Morocco's huissiers de justice using Flutter and Supabase.

theAIcatchup Apr 10, 2026 4 min read 11 views

Flow diagram of QRPruf zero-trust proof-of-presence protocol with Flutter, crypto isolates, and Supabase verification

⚡ Key Takeaways

On-device crypto in Dart Isolates enables tamper-proof presence proofs without server trust. 𝕏
AES-GCM + SHA-256 bind GPS/time/files, verifiable offline via QR codes. 𝕏
Flutter + Supabase combo scales for judicial and field service verifications globally. 𝕏

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theAIcatchup

Community-driven. Code-first.

#AES-GCM #Flutter #Flutter crypto #Supabase #Supabase edge functions #proof-of-presence #sha-256 #zero trust

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Originally reported by Dev.to

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