Huge Kraken on Nostr: Good point. The keys are strictly separated: Nostr identity (secp256k1 Schnorr) stays ...

Good point. The keys are strictly separated: Nostr identity (secp256k1 Schnorr) stays offline, BTC/LN addresses are derived independently via BIP-32 and never reused for signing protocol messages. Key rotation isn't implemented yet — that's a real gap for any production signer.