* WIP: new hashed type

Signed-off-by: Dan Lorenc <lorenc.d@gmail.com>

* wip add signature verification

Signed-off-by: Asra Ali <asraa@google.com>

* address bobs comments

Signed-off-by: Asra Ali <asraa@google.com>

Co-authored-by: Dan Lorenc <lorenc.d@gmail.com>