a simply CGT event? later it constitute removing might onto exchange So then an moving Bitcoin &

Depends on the T&Cs of the exchange, but they should be acknowledging the ownership of the coins by the account holder. Unless they're Coinbase, as I understand from one of their press releases a few years ago that they assert a legal claim over coins on their exchange in event of bankruptcy on their part

Moving bitcoin on and off a regulated exchange is the best way to ‘wash’/reset your uxto history. bitcoin on an exchange is not your bitcoin until you redeem it. Redeeming bitcoin from an exchange is not a CGT event.