You can find out the range from the public key.
This is serious stuff, you probably didn't realize what you said... HOW ON EARTH YOU FIGURE THE RANGE FROM PUBLIC KEY?
To believe in a word or not is your right.
PS Everything will go to society together when the work is completed.
Best regards.
If I tell you a certain key exist in a certain range, and if you know the first character of the private key, you might be able to get close to validating the authenticity of my claim, but without that information, there is no other way than brute forcing all the possible ranges one by one, but it would be great to learn something new before you decide to bring all the societies into the action, so share and care, right?😉