Summary Bitcoin's price climbed back above $65,000 this week for the first time in almost a month. Ether's price surged more than 10% this past week to its highest level in over 3 weeks. ETH is currently up ~46% year-to-date. XRP is currently down ~8% year-to-date. This weekly update tracks some of the largest cryptocurrencies by market share: bitcoin and ether. While both are considered to be high-risk when it comes to investing, the two have foundational differences that investors should know. We've also included XRP, as it was one of the largest cryptocurrencies when this series began. According to Wikipedia, a cryptocurrency is "a digital asset designed to work as a medium of exchange that uses cryptography to secure its transactions, to control the creation of additional units, and to verify the transfer of assets." Bitcoin Bitcoin ( BTC-USD ) was the world's first cryptocurrency and decentralized digital currency. The first bitcoin transaction occurred in early 2009 and has since grown worldwide. Bitcoin's price climbed back above $65,000 this week for the first time in almost a month. BTC is currently up ~47% year-to-date. Ether Ether ( ETH-USD ) is another cryptocurrency run on the Ethereum blockchain platform and has the second-largest market share, despite being the newest of the three discussed in this article, with its launch in July 2015. Ether's price surged more than 10% this past week to its highest level in over 3 weeks. ETH is currently up ~46% year-to-date. XRP XRP (XRP-USD), which is owned by Ripple and launched in 2012, was one of the larger cryptocurrencies for some time until new coins joined the market. We've included it in this article for reference. XRP is currently down ~8% year-to-date. Bitcoin vs. Ether vs. XRP An index has been created in order to chart these three cryptocurrencies together, considering their significantly different pricing histories. Ether tops the chart, i.e., the price of an ether has changed the most out of all three cryptocurrencies. On January 10th, the SEC approved spot bitcoin ETFs from a range of issuers such as Grayscale Bitcoin Trust ETF (GBTC), iShares Bitcoin Trust (IBIT), Fidelity Wise Origin Bitcoin Fund (FBTC), ARK 21Shares Bitcoin ETF (ARKB), Bitwise Bitcoin ETF (BITB). Here are some of the quick takeaways from the spot bitcoin ETF launch . Other ETFs associated with cryptocurrencies include: ProShares Bitcoin Strategy ETF (BITO), ProShares Short Bitcoin Strategy ETF (BITI), VanEck Ethereum Strategy ETF (EFUT), and Bitwise Ethereum Strategy ETF (AETH ) . Original Post Editor's Note: The summary bullets for this article were chosen by Seeking Alpha editors.