# 0x0

> P2P disposable number messenger. Connect without identity — no phone number, no email, no account required.

0x0 (pronounced "zero-x-zero", Japanese: 捨て番 / suteban) is an open-protocol, peer-to-peer messaging app. A temporary number is generated locally on your device. You share a PIN with whoever you want to talk to. When you're done, delete the PIN — the connection disappears silently.

No server relays messages. No logs. No trace.

## Core concept

- **Number**: generated locally on your device, never registered anywhere
- **PIN**: shared per-contact, one PIN per conversation thread
- **Channel**: derived from number + PIN using a cryptographic hash — only the two parties can connect
- **Disconnect**: delete the PIN to silently sever the connection, no notification to the other side

## Technical stack

- Transport: Hyperswarm (P2P DHT, hole-punching)
- Encryption: Noise protocol (end-to-end by default)
- Local storage: SQLite with AES-256
- Push notifications (opt-in): Cloudflare Workers → APNS / FCM
- Mobile: iOS (Swift) + Android (Kotlin)
- Core library: Rust + UniFFI bindings

## Use cases

- Marketplace / classifieds: give a buyer a PIN, revoke it after the deal
- Dating / matching: share a PIN instead of your real number
- Work freelance: one PIN per client, no personal number exposed
- AI agents: same protocol works for human-to-bot communication

## Status

- CLI (Node.js): released
- Rust core: released
- iOS / Android: in development
- Web landing: https://0x0.contact

## Links

- [Homepage](https://0x0.contact/)
- [Privacy Policy](https://0x0-notification.tiidatech.workers.dev/privacy)
- [Sitemap](https://0x0.contact/sitemap.xml)