7:00-12:00 Keywords: grey release, Ukraine, Microsoft, White House 1. The circulation of USDC has decreased by approximately 600 million in the past 7 days; 2.Grey released a total of about 2,730 bitcoins through multiple transactions this morning; 3. Ukraine is exploring setting cryptocurrency tax rates between 5% and 10%. Microsoft will withdraw from Skype in May this year, and Skype will operate until May 5. 5. The judge rejected the SEC's lawsuit against Richard Heart, the founder of Hex tokens. 6. White House: The first cryptocurrency summit will be held on March 7, and Trump will attend and speak.