This week alone, the digital currency Bitcoin surged $5,000 to a new high of $18,000 before correcting back to $15,000. The cryptocurrency is up nearly 2,000 percent over the year. If you had invested $100 in January, it would be worth $2,000 today.
According to Greenspan, the growth of BTC could be sustained, though they were sure to face some issues on the way.
However, if Bitcoin is the money of the future, the price of this digital currency will keep rising at a faster rate.
The Bitcoin Investment Trust is a fund that tracks the movement of Bitcoin.
The GBTC showed a rise of 3.3 percent, demonstrating that the digital currency had touched record highs.
Bitcoin has risen by nearly 200 percent in 2017 so far, and has performed better than other benchmarks like Nasdaq and the S&P, which only rose by 16.9 percent and 8.81 percent.