We can't lose the keys we never hold.
Plain language, no dark patterns. Here's exactly what stays with you and what the service sees.
Last updated: August 2026
The short version
Sigyl has no email, no phone number, and no password. Your identity is a key generated on your device, and we never hold it in usable form. We do store the content you choose to publish — your posts, photos, and videos — because a social network has to keep them on a server to show them to other people. Beyond that, we hold as little about you as the product can possibly function with.
What we never collect
- No passwords — there are none to collect.
- No photo of your face — the liveness check happens entirely on your device.
- No copy of your private key in usable form — it stays sealed on your phone.
The liveness check
To keep bots out, a one-time check confirms a real, live person is signing up. This produces a one-way mathematical fingerprint used only for bot-resistance. It cannot be reversed into your face, and it is not used to identify you across the service or anywhere else.
What the server sees
To run the network, the server stores: your public key and alias; whatever profile details you choose to make visible; and the content you publish — posts, comments, polls, and the photos and videos you upload (media is held in our storage so it can be delivered to others). Each action is signed by your key. This content is visible to the people the network shows it to, and is not end-to-end encrypted.
Direct messages use the Signal Protocol (the X3DH key agreement and the Double Ratchet algorithm): they are end-to-end encrypted on your device and readable only by your recipient. The server stores only the encrypted ciphertext needed to deliver a message — we cannot read your messages, and we never store readable message content.
Your control
You can export your data and delete your account from within the app (see the full deletion guide). Deleting removes your server-side records associated with your key.
Children
Sigyl is intended for people aged 18 and older.
Changes
If this policy changes, we'll post the updated version here with a new date.
Contact
Questions or a privacy request? Email team@sigyl.app.