Keystone is a hardware wallet designed to provide secure, air-gapped cold storage for cryptocurrencies. It features a 4-inch touchscreen and utilizes QR code scanning for transaction signing, ensuring isolation from network connections such as Wi-Fi, Bluetooth, NFC, and cellular networks. This design enhances security by minimizing potential attack vectors. Keystone’s firmware is open-source, allowing for community audits and increased transparency. The device also includes multisignature support and advanced recovery mechanisms to safeguard assets.