PotCoin is a digital cryptocurrency that was specifically developed to remove the need for cash transactions between marijuana consumers and dispensaries.The currency is valued at just over 13 US cents.  Marijuana is illegal under federal law, so the majority of banks won't take cash or open lines of credit for marijuana businesses. PotCoin was developed to facilitate transactions between marijuana consumers and businesses, removing the need for cash. 

http://www.businessinsider.com/weed-cryptocurrency-potcoin-dennis-rodman-north-korea-2017-6