From nostr:npub17u5dneh8qjp43ecfxr6u5e9sjamsmxyuekrg2nlxrrk6nj9rsyrqywt4tp ‘s AI chat on his website:

“FROST (Flexible Round-Optimized Schnorr Threshold Signatures) is a cryptographic protocol designed for threshold signing, where a group of participants collectively produces a single signature. While FROST itself doesn't inherently include a "key rotation" mechanism, the concept of key rotation in a threshold setup can be implemented by updating the key shares and public keys used in the protocol.

In a multisig or threshold scheme like FROST, key rotation typically involves generating a new set of private key shares and a corresponding public key. The process might look like this:

Key Generation: A new threshold key pair is generated. This involves creating a new private key and splitting it into shares for the participants, ensuring the same threshold (e.g., 2-of-3 or 3-of-5) is maintained.

Share Distribution: The new private key shares are securely distributed to the participants. This step requires a secure communication channel to prevent interception or tam secure transfer. Participants replace their old shares with the new ones.

Public Key Update: The new public key, derived from the new private key shares, is shared with all participants and used for future signing operations.

Transaction Migration: If the old key was associated with specific Bitcoin addresses, funds may need to be transferred to new addresses derived from the updated key.

Key rotation in threshold schemes like FROST enhances security by invalidating old keys, mitigating risks from compromised shares, and ensuring the system remains resilient. However, the exact implementation depends on the specific use case and software supporting the protocol. If you're looking for practical examples, Casa's multisig wallet offers a user-friendly approach to key rotation, albeit not using FROST specifically.”