Those already exist. They're Visa cards or Mastercards and you can purchase them at most major retailers. You load them with moneys at the retailer, then you can use them anywhere, like you would a debit or credit card. They've existed for the better part of 10 years in the general public. I honestly thought that was common knowledge.
Prepaid cards cost a shitload of money (15€ p.a. fee, plus 1-5€ per top-up). While this may be something for you if your credit report is too smashed for banks to give you a "real" one, I consider the prepaid cc's as last-resort.
The prepaid cards I've seen only cost about $0-2.50 USD. I've never seen one as high as $20 USD (which is what 15€ currently exchanges to).
Arguably, prepaid cards from shopping malls aren't a good solution anyway. If you're paying for them in cash, then you'll never build up a credit history. And if you pay for them with your credit card... well then that's pointless since you may be buying them from the next Target.
> If you're paying for them in cash, then you'll never build up a credit history.
Unless you rent or buy a home, have utility bills, rent or buy a car, etc. You don't have to use credit cards for retail transactions to build up a credit history.
Or was that just a sales pitch for BTC?