Cold Root Identity v0.1.0

Cold Root Identity is a simple model for survivable Nostr identities. No protocol changes, no new relay behavior, and no delegation logic.

The idea is straightforward:

- A root key stays offline as the authority

- Epoch keys are derived deterministically for actual daily use

- A signed lineage event proves each new epoch key is legitimate

- Clients treat the newest valid epoch as the user’s active identity

- Old posts stay under old keys; new posts use the fresh one

This gives users safe key rotation without burning their entire account. A compromise only affects a single window instead of the whole identity.

The Python reference implementation, test vectors, and spec are here: