What does Bitcoin mining mean?

Currency exchange fee discount and commission service:
We mainly recommend Ouiyi, followed by Binance. Professional contract players can save 20% on handling fees.
If you already have an account, if you have not logged in to Oyi for 180 days, or have not traded on Binance for 180 days, you can follow the registration link below to log in and follow the prompts to bind the invitation, and then it will become a rebate account. If 180 days is not enough, you can register an account again.
1. OKX (formerly okex): Invitation code AK888, OKX registration link: https://www.okx.com/cn/join/AK888 (save 20% transaction fee), or refer to OKX invitation Code registration tutorial. For spot contracts, 20% is automatically returned every hour.
2. Binance: Click on the Binance registration link, recommendation code XSGEK3VL, Binance registration: https://cix1.xyz/ or refer to the Binance registration tutorial. For spot contracts, 20% is automatically returned every hour.