Bitcoin was $800 a year ago. Now it's $16,000 - Bitcoin ...

One year ago, it was below $800.

But bitcoin's value on various exchanges can be quite different.

One exchange, Coinbase, listed the price of a single bitcoin at more than $18,400 at one point Thursday morning before it dropped back to around $16,000.

Related: What's driving the bitcoin frenzy

Another exchange, Bitfinex, shows bitcoin topped out around $15,800...

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