The first major Wall Street strategist to cover bitcoin predicts the digital currency will more than double in 2018 to $25,000 in the wake of its crash this year that saw it lose 50 percent of its value from a December record.

Fundstrat's Tom Lee is out with his latest report on bitcoin, which moves up a $25,000 price target by four years, from 2022 to the end of this year. Lee's model for valuing bitcoin now predicts it will reach $125,000 by 2022.

"We expect bitcoin's major low to be $9,000, and we would be aggressive buyers around that level," Lee said in a Thursday report. "We view this $9,000 as the biggest buying opportunity in 2018."