Logan Paul, a YouTuber, has threatened to sue fellow YouTuber Stephen Findeisen, also known as Coffeezilla, for defamation after Findeisen accused Paul’s CryptoZoo nonfungible token (NFT) project of being a scam.

Findeisen launched a three-part video series attacking CryptoZoo and Paul on Dec. 17.

In response, Paul published a YouTube video on January 4 accusing Findeisen of spreading false information about the project without verifying any evidence.

CryptoZoo is an NFT game that allows users to buy NFT eggs using the game’s native token, ZOO. The eggs can be hatched into animals that can be bred to create hybrid animals that are tradeable and provide users with ZOO.

Some have questioned the authenticity of Paul’s claims that the game is still being developed. The Zoo token has dropped 99.5% in value over the past year.