Ark Fund modified the 19b-4 document to add a monitoring sharing agreement with CBOE Chicago Board Options Exchange and a cryptocurrency exchange (possibly Coinbase). It has the same goal as BlackRock and strives to become the first approved Bitcoin spot ETF. 21Shares, Ark and Cboe's Bitcoin spot ETFs are ranked first because their next SEC decision date is August 23, 2023, but the dates of 19b-4 applications of other institutions, such as BlackRock, have not yet been determined. Once the ETF is approved, it will bring a lot of funds and fresh blood to the currency circle.