Use of secure chips for storage of hashed data and private keys in hardware cryptowallets

A cryptowallet, comprising:

• 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 and embedded on a SIM card;
• wherein the storage stores a file system representing multiple cryptocurrencies,
• wherein the file system is a tree that stores a private key for each cryptocurrency,
• wherein 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 secure cryptoprocessor,
• wherein the cryptographic logic implements cryptographic functions required by the cryptocurrencies, and
• wherein the cryptowallet is configured to connect to the host using a USB connection, and
• wherein connection between the microcontroller and the secure cryptoprocessor can be performed via the ISO7816 or NFC interfaces, and
• wherein a three-level PKI is used for authentication of the cryptowallet, wherein each level has its own public-private key pairs, and wherein the three-level PKI includes public/private key pair for authenticating the SIM card, public/private key pair for authenticating that the SIM card was produced by a trusted manufacturer of the SIM card, and public/private key pair for a certification authority to certify the trusted manufacturer.