Abstract: A cryptowallet includes a microcontroller configured to communicate with a cryptowallet application running on a host; a touch display connected to the microcontroller and used to input a PIN code and a mnemonic seed for the cryptowallet for each cryptocurrency, and to output a destination address for a transaction and the mnemonic seed; a secure cryptoprocessor having storage and cryptographic logic. The storage stores a file system representing multiple cryptocurrencies. The file system is a tree that stores a private key for each cryptocurrency. The cryptowallet application is configured to communicate with a cryptocurrency network communication component, for carrying out transactions using the cryptocurrencies, that are authorized by using the private key upon providing the PIN code and the destination address of the transaction to the cryptoprocessor. The cryptographic logic implements cryptographic functions required by the cryptocurrencies.