I was informed by the company who sold me my bitcoins machine that I could convert my bitcoins to cash by using a mastercard so that I could make purchases or pay other bills using that mastercard, is this true and how do I do this? If not, what is the best method to convert bitcoins to cash?
I recommend going on localbitcoin.net and sell your Bitcoins in person. You can also send them to a service such as Coinbase, but I highly recommend doing it in person as you won't pay for a cut.
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