Phonchain – A Mobile-Native Blockchain Secured by Smartphones (Pop-S4)

The project actually publishes canonical genesis anchors, protocol specs, bootstrap endpoints and a live explorer — so this reads like a working protocol, not just vaporware. The core idea (PoP-S4.1: up to ~30k phones per block) is a bold, unusual approach to consensus, but the repo shows little community traction and lacks obvious public audits or transparent attestation primitives, so treat the live network with healthy skepticism until security details and client code are clearer.