New York (CNN Business) What a difference a year makes for bitcoin.

In December 2017, bitcoin prices hit a record high of just under $20,000. Flash forward to December 2018 and bitcoin is now trading a little below $3,400. That's a more than 80% plunge. Bitcoin is at a 15-month low.

But prices have really gotten whacked this week, falling nearly 20% in just the past five days alone.

Bitcoin isn't the only cryptocurrency getting hit either. Ripple/XRP, ethereum, stellar, litecoin and numerous other cryptocurrencies have plunged in the past week.

Little tangible news can explain or justify the current crypto carnage.

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