It's called an Exchange....
you exchange BTC into dollar UKP Euro etc and send them to your account
I explained that in my original post. If I exchange BTC for Dollars, I would have to pay taxes on that gain.
Example, purchased 10 bitcoins for $1000 and now that is worth $10,000. If I want to pay my mortage today, I would exchange that for $10,000 and send to my bank account then pay mortgage. That would require me to pay taxes on the $9000.
If there was a way for the mortgage to be paid through a service which I give BTC to, example = I send the 10BTC to a service, and they send $10,000 to my mortgage company, I would not need to pay taxes on the $9000.