Bitcoin rose above $18,000 on Tuesday evening, reaching its highest value since December 2017. Indeed, prior to this week bitcoin has only been worth more than $18,000 for a brief four-day period at the peak of the 2017 bitcoin boom: from December 16 to December 19.

After reaching a high around $19,500 in December 2017, the currency’s value fell to $6,000 in February 2018, then to $3,200 in December. Since then, its value has risen in fits and starts, rising above $18,000 late on Tuesday.

Bitcoin’s value fell a bit in Wednesday morning trading. As I write this, one bitcoin is worth around $17,800.