The Amplify Transformational Data Sharing ETF is a popular fund that invests in businesses with exposure to blockchain technology, the unique backbone of the cryptocurrency market. Top holdings include Silvergate Capital Corp. (SI), Galaxy Digital Holdings Ltd. (GLXY) and Coinbase Global Inc. (COIN). The BLOK ETF provides significant diversity within the blockchain space. It has 45 total holdings, and its top 10 holdings account for about 44% of its $1.7 billion in assets. The BLOK fund does not hold cryptocurrencies directly, but several of its holdings do, including Galaxy Digital and Square Inc. (SQ). The fund has a 0.71% expense ratio.