Umm, at any major exchange? The initial setup, of linking your identity to an account would take a long time I INITIALLY, but after coinbase knows what your id

Umm, at any major exchange? The initial setup, of linking your identity to an account would take a long time I INITIALLY, but after coinbase knows what your identity is, has informed the IRS, and the government knows that you are not engaging in money laundering, it is quite quick. 50 million is easy, and markets trade that amount every day. Current volume is something like 400 million dollars of Bitcoin in the last 24 hours.