Centralized Exchange (CEX)
CEXs are trading platforms that function like traditional brokerage or stock markets. A CEX is owned and operated by a company that maintains total control over all transactions.
The best approximation of the number of coins / tokens in cryptocurrencies that are in the publicly tradable space.
Coin mixers allow users to mix up transactions between different cryptocurrency addresses, so they become untraceable and cannot be followed back to the initial sender or receiver of the assets.