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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.
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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.
IRLid — Proof of Personhood was featured in Open Source (68.4k followers), Privacy (11.1k followers), GitHub (41.2k followers) and Security (2.6k followers) on Product Hunt. Together, these topics include over 41.7k products, making this a competitive space to launch in.
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.
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Spencer Austin