Hi, Philip, I did some research about Joyson Hu of Akminer, I think better you arrange some people in Shenzhen to talk with him or his boss directly.
1. Below 3 companies are related. https://www.evensontech.com/contact-us/ This company looks like a shell http://www.tankya.com/art/about-us-1.html They have a HK company but already stopped. The current company names are 深圳市首尔诺科技 and 深圳市云博瑞科技. These 2 legal entities are both good-standing right now, just with a tiny registration capital of 200K RMB ~ around 30K USD. The boss is Mr. Su Jiancheng 苏建诚 https://akminer.com/ Seemed they did not found a dedicated Chinese legal entity for Akminer, although not a big issue
3. Joyson's 2 emails joyson@akminer.com;joyson@evensontech.com and 2 cell phone number 15818167740 18682005253. You can try to add his Wechat by the mobile number.
4. Some Reddit posts suggested their service not being perfect, but majority posts said they are not scammers, just imperfect in a few cases.
So perhaps you better keep a good communication with them and make sure all the details are correct. Good luck!