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Logan Paul 's CryptoZoo legal nightmare is officially over ... 'cause TMZ has learned a judge has reaffirmed the August dismissal of the class action lawsuit against LP, which accused him of defrauding investors in his failed NFT project.

The case stemmed from CryptoZoo -- Logan's 2021 NFT game that promised players could earn money by breeding "virtual animals" ... but the project never really got off the ground. Disgruntled investors filed a class action lawsuit last year, claiming Logan and his team "rug-pulled" the project and misled buyers. X/@CryptoZooCo/@coffeebreak_YT

According to a magistrate judge, the plaintiffs failed to link Logan directly to their alleged losses. This week, a district judge agreed.

Paul's attorney, Jeff Neiman , tells TMZ ... the "distric

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