It’s a very solid analysis, thank you for that!
Map 3 is the best, and I think it could serve as a basis for further analysis - if fiat currency addresses the same user need as BTC, then what is advantage of BTC in that context?
I would love to see a bit more about legal and risk aspects (f.e. what happens if you accept a fraudulent transaction, how to protect from those, etc).
The “clearly superior technology” is a bit misleading to it. It is obviously more advanced, but superiority has to have fitness function defined. In the end, the ‘advancement’ of a technology does not matter that much, what counts is how well the end user need is met.
Map 6, as I read it, detaches BTC from Blockchain. A very good observation!
Oh, and if this is your first attempt to draw a Wardley Map, you have done an awesome job!!!