Bank of Canada published a research report named “The Economics of Cryptocurrencies—Bitcoin and Beyond” stating that crypto mass payments are the best option for retailers. According to the report if the means of mining the cryptocurrencies is expensive then it prevents attackers from double-spend on transactions, regardless of the number of transactions. Crypto mass payments will be beneficial for systems that are based on a large number of payments that have smaller values and will be less useful and expensive for fewer transactions that have more value.