Re: How computationally expensive is an ECDSA and signature calculation?
You're expecting people to do mental arithmetic to check for bogus terminals?
Everyone walks around with a portable computer in their pocket these days. People will just use phones instead.
If by "everyone" you mean half or less than half the world's population sure:Everyone walks around with a portable computer in their pocket these days. People will just use phones instead.
http://www.go-gulf.com/blog/smartphone/
Of those only 29% have mobile internet:
http://en.wikipedia.org/wiki/List_of_countries_by_number_of_broadband_Internet_subscriptions
The mental arithmetic is not required, you can just put your PIN. There are also other safe guards so the 10 BTC charge can not happen.
My grandmother has trouble enabling her phone's USB storage device connection type - so good luck with a complex app that requires constant internet connection to function and will crash her phone if she installs the wrong non-light app.
I consider my potential market share very decent
