For US customers no different from other merchant payment services, money transmitter licenses. For example to deposit funds in Circle or coinbase they must know their customers which means CPI, AMLBSA, etc. think bank account (send) to bitcoin exchange above and exchange to bank account receive. NACHA file standards credits and debits. The exchanges follow your bitcoin send to certain addessses. Best bet is to move your bitcoin to a off exchange wallet. I'm not going to get into how to tumble.How's bitcoin regulated currently?
If you are entering or exiting into USD, it's tracked period.