On March 9, Bitcoin once again approached the $4,000 level. It did this as many of the other top 20 digital currencies saw modest gains. For the day, Bitcoin is up nearly 1% and is trading at about $3,960. For the week, the world's leading digital currency is up almost 3% after starting the week at $3,851. Helping drive Bitcoin's rise this week has been the news that Jack Dorsey, who is the CEO of both Twitter and Square, has been buying $10,000 worth of the currency every week. He announced this during a podcast broadcast early this week. Ethereum is continuing to hold its position as the second largest digital currency in the world by market value. The currency currently has a total value of nearly $14.5 billion. Ripple continues to be the third largest digital currency, with a market capitalization of around $13 billion. For the day, Ethereum is slightly down 0.15% while trading at $138, and this is pretty much what it started the day at. For the week, though, the currency is up around 2.5% after starting the week at around $133. Helping the currency this week has been a report from a digital asset management company called Electric Capital. They claimed that their research shows that Ethereum has the most developers of any cryptocurrency in terms of those who are working on the currency's core protocol. As for Ripple, for the day it is up about 0.33% and is trading at about $0.314. For the week, it lost a modest 0.44% after starting at a price that is practically the same as it is now. Helping it maintain its price has been comments from CEO Brad Garlinghouse. He said that he believes a potential competing currency being developed by JPMorgan Chase lacks the interoperability of Ripple. Among the other top 20 digital currencies, Nem has experienced the greatest price rise for the day. It rose by almost 10%. The total market value of all digital currencies is currently close to $135 billion, which is nearly 4% greater than what it began the week at.