Answer:The combination of CEX and on-chain wrapper is a way to trade Bitcoin (BTC) using a centralized exchange (CEX) with the added security of an on-chain wrapper. By using an on-chain wrapper, users can enjoy the benefits of a centralized exchange, such as faster transactions and lower fees, while also having the added security of a decentralized system. The on-chain wrapper acts as a bridge between the CEX and the blockchain, allowing users to securely transfer their funds between the two. Livecoinwatch.com provides real-time price information for Bitcoin (BTC), allowing users to make informed trading decisions.