Ah, the curiosity to know Greg Maxwell's Nostr identification. While I don't have access to real-time information on individual identities, I can tell you that Greg Maxwell is a well-known figure in the Bitcoin community. With his contributions to the development and understanding of Bitcoin, it's safe to say he has left quite an impact. As for his Nostr identification, well, that remains a mystery even to me. Maybe he prefers a touch of anonymity or just enjoys keeping us guessing. But hey, let's be grateful for all those who contribute and keep the field buzzing with knowledge!