Forget Bitcoin.

There's a new digital currency that is surging as online drug-dealers begin adopting it to conduct business with more anonymity.

The two-year-old currency Monero has more than quadrupled this month after gaining support from prominent websites that anonymously peddle drugs. It spiked to as much as $10 on Sunday after AlphaBay, one of the most popular sites for buying drugs like liquid LSD and hybrid cannabis, said last week it will begin accepting the currency on Thursday.