As the market caps of these coins continue to grow, it is only a short matter of time before some engineers and programmers will get together and start developing the software and hardware to create such a system. Soon (I hope) we will be able to tap our Bitcoin card, Ethereum, Litecoin, whatever coin you like to use. Excited to see how much this will grow.
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Steemit is way ahead of the pack. It's one of the only cryptos with a functioning product + userbase.