1. Price: Generally speaking, the price of new season jerseys is 400-600 yuan for fans and 700- 1000 yuan for players. If the price is too outrageous, it is necessary to doubt its authenticity.

2. Texture: The material and feel of the jersey is an important basis for judging whether it is true or not. Authentic jerseys are elastic, soft and breathable, and will not stick to the body after sweating. If the jersey is poor in texture, elasticity and workmanship, it may be a cottage product.

3. Letters and numbers: On the front of the Curry 30 jersey, the letters and numbers of the Curry number and name are printed. Authentic alphanumeric clear, neat printing position, while the fake products alphanumeric fuzzy, irregular printing position.

4. Logo: In the lower right corner of the jersey, there is a Nike logo. Authentic logo is clear, with obvious concave-convex feeling, and the logo of cottage products is vague, without concave-convex feeling.

5. Packaging: Authentic jerseys have complete packaging, including tag, desiccant, cardboard, etc. And cottage products are often not completely packaged or poorly packaged.

To sum up, judging the authenticity of 30 library jerseys should be considered comprehensively from many aspects. If you are not sure about the authenticity of the jersey, you can buy it through official channels or ask professionals to identify it.