Welcome to Obsign

Obsign is a security instrument for holding and defending an ATProtocol identity. The keys that prove who you are stay on your device, not on a server you have to trust. Obsign seals them there, watches your identity’s public record for tampering, and keeps a recovery path that doesn’t depend on any one device.

This surface is written for people using Obsign. If you run the server side, head to Running Custos instead.

Obsign's home: your seals, with tamper monitoring shown live. See every screen in the tour.

What you can do here

• Getting started — create or bring an identity.
• Signing in to apps — approve sign-in to a third-party app with your wallet, no password.
• Tamper monitoring & recovery — how Obsign watches for unexpected changes and the 72-hour override that lets you take back control.
• 2-of-3 Shamir backup — split your recovery secret so no single lost device locks you out.
• Backing up your content — keep your own verified copy of your posts and media, the one backup that survives your server failing.
• Migrating your identity — move between servers without losing your handle, posts, or followers.

Honest about the boundary

Screenshots in these docs are rendered in a browser harness, not on a real device. They are accurate for what a screen does, but not for how iOS renders the real app (Secure Enclave prompts, safe-area insets). Where the difference matters, the page says so.