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5. Other Current Assets (Details - Other Current Assets) - USD ($)
Feb. 28, 2019
May 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 378,340 $ 79,822
Purchase deposits 560,438 145,376
Cryptocurrency on hand 47,027 31,479
Other current assets 106,378 74,951
Total other current assets $ 1,092,183 $ 331,628