We have just released FSM-ORACLE, the first version of our formally verified core! It verifies finite state machine executions by relying on the categorical framework we built in idris-ct, our formally verified category theory library. Communication with the core makes use of our JSON implementation for typedefs, our solution to exchange types and terms between different functional programming languages.
Statebox is a grantee of the Ethereum Foundation Grant program, wave 6. Read more here.