How do Ты know if you've been blocked?

What you've described is exactly how Ты find out you've been blocked. Ты know a page is there, but Ты can't see it или find it in search, and other users can Подтвердить that it is there. That's how being blocked works.

Here are three tips of finding out if your friend has blocked Ты on Facebook:

1.)Ask mutual Друзья if the person whom Ты suspect has blocked Ты is still on their Друзья list. If they can view his или her profile, it is a sign that Ты have been blocked. Since Ты have already confirmed this, then yes, Ты have been blocked.

2.)Go through old conversations with that person. Click the 'Actions' button and select Сообщить Conversation. If Ты see 'Blocked' Далее to the person's name, this means that Ты have been blocked by the person. If Ты see 'Report' instead of 'Blocked' then it implies that the person has deactivated the account.

3.)Access the person's Профиль link. If Ты get a "Page Ты requested was not found." it is either Ты were blocked или the account has been deactivated. Try to access the Профиль link with a new account или another account to know for sure.

Source: link

Lucas Chad blocked me

Because when I look for my friend his Профиль comes up with a blue square at it says This Профиль is locked