Henceforth is an operating system and programming language. based on FORTH by Chuck Moore. To learn FORTH from scratch I recommend Starting FORTH by Leo Brodie.
Bitcoin [BSV] is a part of henceforth, chosen to make use of the immutable money ledger and contracting solutions which only Bitcoin can provide at sufficient scale and low cost. Read the White paper available on Craig Wright (Satoshi Nakamoto’s) website.
App is in beta, and available via the TestFlight store. Contact me with your email if you would like access.