A lot has changed. But also you must've checked it quite some time ago. It's not on the blockchain anymore since the "heartwood" iteration, which was announced 2023-04-18. Please take some time to re-inform yourself, even just in this HN thread (search for "RAD ", the whitespace is significant).

I don't know about previous versions, but afaik since the release of the current heartwood implementation it is neither based on a blockchain nor does it include any "crypto" stuff. If it did, I probably wouldn't be using it.