True, messages and author are signed. Let's go by this statement. Having a verified account on nostr does not necessarily mean they are who they say they are. Everyone can go through nostr verification at the same time pretending to be someone else. Unless you personally know that person — you have some other means of contacting them, Eg. Private messaging app outside nostr or contact number or in person, you would not know if they are who they say are. Unless I misunderstood this part. Example, Jack Dorsey's account has been impersonated by multiple accounts and they were verified accounts but they were faked. The only way of knowing is sadly the number of following of Jack. The impersonators have less than less than 10k following whilst Jack has 200k plus followers. The bottom line, unless you personally know someone or you use other platform like X with verified account and post your npub there, only then you can say that it was Jack. But I may have understood this and open to know more. ☺️