Methods to identify the authenticity of bird's nests include: observation of appearance, smell, soak test, bird's nest fiber test, and purchasing channels.

1. Observe the appearance: Genuine bird's nests usually present a uniform, delicate and shiny appearance with a soft and flexible texture. Counterfeit bird's nests may have a rough, uneven appearance and a harder texture.

2. Smell: Genuine bird's nests usually have a faint oceanic odor, while counterfeit bird's nests may have other odors, such as chemical or flavoring smells.

3. Soak test: Soak the bird's nests in water, the real bird's nests will gradually become softer while the fake bird's nests may not have obvious changes.

4. Bird's Nest Fiber Test: Gently pull the bird's nest with your finger, the real bird's nest will have fiber ductility, while the fake bird's nest may break easily.

5. Purchase channels: Choosing reputable merchants or brands to buy bird's nests can reduce the risk of buying counterfeit products.