Mining by mining machines is more complicated and the threshold is higher, such as Shenma, ants and other mining machines.
Mining with cloud computing power is relatively simple, and the cost of computing power is not refundable, such as deer biting and Rubik's cube calculation.
It is relatively simple to calculate the deposit of certificates, and the threshold is low, and the calculation fee can be refunded, such as XBIT and VCT.