graph-store: if there is no hash in added node, replace signatures with ~, otherwise check validity of signatures
graph-store: if there is no hash in added node, replace signatures with ~, otherwise check validity of signatures

ngzax/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,urbit/urbit