The use of P2P digital currency is not possible without technical tools, as each transaction requires a computer/smartphone with client software and Internet access installed on it. In addition, the software dependency means that security updates for all clients may become necessary due to errors in the software or the cryptographic algorithms behind the cryptocurrencies – these updates from millions of computers would inevitably cause a complete interruption of the system during which no transactions could take place – hard to imagine in a global economic system.