PANews, December 12 news, according to Securitize's announcement, former Grayscale Investments CEO Michael Sonnenshein officially joined the company on December 9 as Chief Operating Officer (COO). During his 10-year tenure, Sonnenshein grew Grayscale into the world's largest cryptocurrency asset management company, managing assets worth tens of billions of dollars, and facilitated the approval of the first spot Bitcoin ETF in the United States.