The Validate Hash Node takes a hash that was created beforehand with the Generate Hash Node and validates it against a specified string by hashing it as well and comparing the two hashes. Alternatively, you don't need the Validate Hash Node to validate a hash; for example, if you are checking a password, you can simply create a new hash of the entered password and test it for equivalency against the existing hash string made for the correct password.
String / Password: The string to create a hash from to compare to existing hash.
Existing Hash: Hashed string to compare.
The Validate Hash Node outputs on
valid if the hash is valid, and outputs on
invalid if it isn't.