How to select mining coins and mining machines?

1. Go to www.viabtc.com and refer to the Mining Profit Ranking 

Before mining, you need to consider the following factors to purchase mining machines:

1) Mining coins (It is recommended to choose Bitcoin as your mining coin if you are a beginner)

2) Miner brands (Different mining machine brands have different quality. It’s recommended to purchase the mining machine produced by Bitmain) 

3) New or second-hand mining machines  (In general, old mining machines are cheaper. It’s recommended to purchase a brand new machine for a beginner)

4) Calculation of mining cost and expected revenue

How to calculate return cycle: 

Return cycle = mining machine price/(Bitcoin output on the day * Bitcoin price on the day - electricity price per kWh * 24 * mining machine power (unit: KW))

As the difficulty value of Bitcoin changes once every two weeks and the coin price changes at any time, the above calculation result serves as a reference only, and the actual return period may change.