* signAndSend with finalized hash (depending on drift)
* Extract lag calc
* mock update
* getSigningHeader
* api.derive.tx (with submittable cleanups)
* Adjust mortal calculations
* Cleanup new tx derives
* Optimize calcs
* Comment cleanups, next-up testing
* Adjust mocks
* Adjust sig (period is now based on metadata)
* Remove extra fn, tested and it works