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IRLid — Proof of Personhood
Prove you physically met someone — like reCAPTCHA but IRL
IRLid lets two people prove they physically met — no app, no accounts, no biometrics required. Two phones. Two QR scans. One cryptographically signed receipt proving co-location within 12 metres at a specific time. ECDSA P-256 via the Web Crypto API. Entirely browser-based. v4: optional bio-metric confirmation (Face ID/fingerprint committed into the signed payload), privacy mode (GPS replaced with SHA-256 hash), trust history scoring. Open source. Free. One developer, UK, spare time.
Hi PH 👋 Solo dev from the UK here.
IRLid started from a simple problem: there's no lightweight, privacy-respecting way to prove two people physically met. Every existing solution either requires an app, a central database, or biometrics you can't opt out of.
IRLid is the opposite: two phones, two QR scans, one cryptographically signed receipt. ECDSA P-256 via Web Crypto API. No download, no account, no server storing who met whom.
v4 (just shipped) adds optional Face ID/fingerprint confirmation, committed into the signed payload, not stored anywhere. Plus, privacy mode where GPS is replaced with a SHA-256 hash before it ever leaves your phone.
Happy to answer questions about the protocol, the threat model, or the honest limitations. There's a full PROTOCOL.md in the repo if you want to dig in.
About IRLid — Proof of Personhood on Product Hunt
“Prove you physically met someone — like reCAPTCHA but IRL”
IRLid — Proof of Personhood was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #148 on the daily leaderboard. IRLid lets two people prove they physically met — no app, no accounts, no biometrics required. Two phones. Two QR scans. One cryptographically signed receipt proving co-location within 12 metres at a specific time. ECDSA P-256 via the Web Crypto API. Entirely browser-based. v4: optional bio-metric confirmation (Face ID/fingerprint committed into the signed payload), privacy mode (GPS replaced with SHA-256 hash), trust history scoring. Open source. Free. One developer, UK, spare time.
On the analytics side, IRLid — Proof of Personhood competes within Open Source, Privacy, GitHub and Security — topics that collectively have 123.2k followers on Product Hunt. The dashboard above tracks how IRLid — Proof of Personhood performed against the three products that launched closest to it on the same day.
Who hunted IRLid — Proof of Personhood?
IRLid — Proof of Personhood was hunted by Spencer Austin. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of IRLid — Proof of Personhood including community comment highlights and product details, visit the product overview.
Spencer Austin