Surfil

Concepts

The mechanics every product builds on. Read these to understand what you're installing before you install it - starting with zero-trace, the invariant the rest is built around.

Zero-trace

Why your source never leaves the device - architectural, not a setting.

Weave

The signed knowledge network: facts with provenance, staleness auto-flagged.

Signed outputs

Every paid output is Ed25519-signed and verifiable offline.

Credits

What is metered - the signed output, not execution.

The pipeline

The five on-device stages, always in the same order.

The One-Layer rule

Exactly one interception point, ever - and why.

Keys & epochs

How key rotation keeps every old receipt verifiable.