SHA-256 hash of null input? What is the SHA-256 hash if the input is null, i.e. an empty bitstring? (Not the hash of 0 or "0".)
The result of SHA-256 of an empty string is:

e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855


Accordingly to this and this