Ledger Hardware Wallets Ledger (France) — second-most popular hardware wallet line. Models based on Secure Element (SE) chips. Models | Model | Year | Notes | |-------|------|-------| | Nano S | 2016 (deprecated) | First popular Ledger; SE + MCU | | Nano X | 2019 | Bluetooth, larger screen | | Nano S Plus | 2022 | Successor to Nano S, more memory | | Stax | 2023 | Touchscreen, e-ink | | Flex | 2024 | Color touchscreen | BOLOS architecture Ledger devices run BOLOS (Blockchain Open Ledger Operating System). Each cryptocurrency has a separate app loaded onto the device: - Bitcoin app ( ) - Ether…