nostr:npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s just wondering, does nsec key and npub key have one to one relationship? Or one npub can have many nsecs? What happens if someone accidentally loses his nsec but has his npub key, can he claim for another nsec for the same npub?