Welcome to Obsign

Obsign is a humane security instrument for holding and defending an ATProtocol identity. It is cryptographic, not custodial: the keys that prove who you are live with you, not with a server you have to trust.

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

What you can do here

• Getting started — create or bring an identity.
• 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.
• 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; they are not a substitute for how iOS renders the real app (Secure Enclave prompts, safe-area insets). Where the difference matters, the page says so.