PANews reported on May 14 that according to The Block, the U.S. Securities and Exchange Commission (SEC) announced that it would postpone its decision on the physical subscription mechanism of BlackRock's Bitcoin ETF and began to solicit public opinions. If the mechanism is approved, it will allow investors to subscribe and redeem ETF shares directly in Bitcoin instead of cash, improving transaction efficiency. The rule amendment submitted by Nasdaq in January this year showed that iShares Bitcoin Trust intends to adopt this model, but the SEC previously preferred a cash settlement mechanism. On the same day, the SEC postponed the approval of Grayscale Litecoin Trust and Grayscale Solana Trust and requested public opinions. The SEC also solicited public opinions on the 21Shares Dogecoin ETF on Tuesday.