You can use the following methods to identify whether it is genuine:

1. Find official certification: Determine whether the source of the gold brick has official certification. Official certification can be issued by relevant authorities, professional appraisal institutions or well-known brands. If there is official certification, the authenticity of the gold bricks will be more guaranteed.

2. Check the brand logo: Carefully observe the brand logo and trademark on the gold brick. A true National Treasure Master Nugget should have clear and precise branding and trademarks, and will usually have a specific serial number.

3. Study packaging and certificates: Authentic national treasure master gold bricks usually have exquisite packaging and detailed certificates. Packaging should be of high quality with specific design and logo. The certificate should contain relevant information about the gold brick, identification results, and the name and contact information of the issuing agency.