1. Need to check the authenticity of the certificate: you can verify the authenticity of the certificate by calling the official telephone number of China Calligraphy Appraisal Committee or going to its designated institution for enquiry.
2. It is necessary to evaluate the reputation of appraisal institutions: you can know the background, reputation and reputation of appraisal institutions through online search and consulting professionals.
Be cautious when trading: you need to be vigilant and guard against all kinds of fraud and risks. It is recommended to buy from regular auction institutions and merchants, and pay attention to keeping receipts, transaction contracts and other evidence.