Legal analysis: you can go to the industrial and commercial system to check whether it is a regular law firm. Law firm refers to the working organization where People's Republic of China (PRC) lawyers perform their duties and carry out business activities. The organization of law firms shall be supervised and managed by judicial administrative organs and lawyers associations. The conditions that a law firm should have are: (1) having its own name, domicile and articles of association; (2) Its assets exceed 654.38 million yuan; (3) Having lawyers who meet the requirements of the Lawyers Law.
Legal basis: Civil Code of People's Republic of China (PRC).
Article 165 If the power of attorney is in written form, it shall specify the name of the agent, the matters to be represented, the authority and the time limit, and shall be signed or sealed by the principal.
Article 919 An entrustment contract is a contract in which the principal and the agent agree that the agent shall handle the principal's affairs.
Article 920 The principal may entrust the agent to handle one or more specific affairs, or may entrust the agent to handle all general affairs.