Seals can be anti-counterfeited in the following ways:

1. Imprinted anti-counterfeiting thread Anti-counterfeiting thread is the most common seal anti-counterfeiting measure, which is achieved by randomly adding lines during engraving.

2. Visible ink anti-counterfeiting/invisible ink anti-counterfeiting: Relatively mature ink ink anti-counterfeiting technologies include thermal ink ink anti-counterfeiting, ultraviolet fluorescent ink ink anti-counterfeiting and infrared ink ink anti-counterfeiting. Visible seal ink anti-counterfeiting means that all parts of the seal's imprints are visible under natural conditions, showing the same or different imprint characteristics, but reflect their respective fluorescence effects under specific light sources.

3. Physical seal with a special security chip embedded in the official seal (referred to as "chip seal"): The most practical, popular and officially recognized anti-counterfeiting method at the moment is to embed a public security chip into an ordinary physical seal. It contains a special security chip, and the chip seal is slightly more expensive than an ordinary physical seal.

It should be noted that the above anti-counterfeiting measures are not absolute, and seals may still be forged. If you suspect that the official seal you receive or see is forged, you should report it to the public security agency immediately.