The bitcoin one! Woaah, thank you so much :)

No, thank you. That must have been a very long and hard slog to get this to work as well as it does and unfortunately this is the only way that I have to show my appreciation of that. (Been there, done that.)

Ha, you're the first person to mention that. It's probably one of the hardest things I've ever done in my life, both technically and in terms of stamina. So I very much appreciate that someone else can understand that.