What is the best hashtag to use with Crypto?

Could you elaborate on what hashtags are typically used in the context of cryptocurrency and what factors should be considered when choosing the best one? Are there any popular hashtags that have gained traction in the crypto community? Also, is it better to use a specific hashtag related to a particular coin or exchange, or a more general hashtag that covers the entire industry? Finally, are there any guidelines or best practices for using hashtags in the world of cryptocurrency?