$ETH $ETH is a hashtag used to monitor Bitcoin (BTC) purchases by MicroStrategy, a company led by Michael Saylor. Saylor is known as a strong supporter of Bitcoin and has made several large-scale purchases of the cryptocurrency for MicroStrategy. This hashtag is used by the cryptocurrency community to track and discuss Saylor's investment strategies and their impact on Bitcoin prices. MicroStrategy's Bitcoin purchases are seen as an indicator of strength and confidence in the cryptocurrency.