Logan Paul is taking legal action against popular YouTuber Coffeezilla ... claiming the internet investigator is purposely spreading lies to tarnish his reputation.
The docs were filed on Thursday ... with the WWE Superstar suing Coffeezilla -- real name Stephen Findeisen -- and his production company for defamation over his deep dive into Paul's failed CryptoZoo project.
In case you haven't been following along, Coffeezilla has released numerous videos addressing the fallout of the blockchain game for the past two years .