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Bangladesh Bank has recently written to CID, saying that cryptocurrency transactions are not a crime, What is this cryptocurrency.? But people have dreamed of such a currency for, a long time, Which can be apent like Cash money, but there will be no sign ofthe transaction,With this currency in hand, transaction can be done through the internet all over the world, But a big problem is with the conttrol system of this currency, which scientists call the Bazantine General problem, What is this problem? How can this be solved What is blockchain.?