user4241: Suppose I know a specific address and I know a full HD Public Key. Is it possible to determine if the address is a hash of one public keys generated from the HD public key in constant time, or in other words without checking every possibility? 

user48884: No, it is impossible to know. You would have to check every possibility.

4241: <p>Suppose I know a specific address and I know a full HD Public Key. Is it possible to determine if the address is a hash of one public keys generated from the HD public key in constant time, or in other words without checking every possibility? </p>
 48884: <p>No, it is impossible to know. You would have to check every possibility.</p>
