As someone who's read the paper, do you know how they account for ownership by exchanges? There's got to be a large amount of BTC that is held in Coinbase's wal

As someone who's read the paper, do you know how they account for ownership by exchanges? There's got to be a large amount of BTC that is held in Coinbase's wallets, but actually owned by many more individuals. I.e. isn't the BTC I have parked at Coinbase is in the same wallet as many of their other customers' BTC, and shows up on the blockchain as one owner by this analysis?