It is unclear whether Chain x is a legitimate Bitcoin company. While there is some information available online about the company and its products, such as its implementation of the Lightning Network protocol and its use of the substrate blockchain framework, there are also several red flags that suggest the company may not be legitimate. For example, there are multiple reports of fake cryptocurrency websites and trading platforms using the Chain x name, and the company's website does not provide any information about its team or ownership. Additionally, there is no mention of Chain x on the website of the UK's Financial Conduct Authority (FCA), which regulates financial firms in the country. It is important to exercise caution when investing in or doing business with any cryptocurrency company, and to thoroughly research the company and its reputation before making any decisions.