100% air gapped hardware wallet: securely and conveniently send and receive crypto assets via QR code. Secure: Your private key will be stored in the secure element and will never leave there. The firmware of the Secure Element, hardware design (circuit diagram and BOM), hardware wallet application layer, and some parts of the hardware wallet operating system layer are open sourced. Multicoin and BTC only firmwares available: the multicoin firmware supports 1000 cryptocurrencies including BTC, ETH, USDT, BCH, XRP, TRX, LTC, DASH, DOT, KSM and tokens of ETH, TRX. The BTC only firmware is compatible with 10 3rd party software including but not limited to Bluewallet, Electrum, Specter, SushiSwap, MetaMask, etc. Advanced features: PSBT BTC multi sig, ETH multi sig, cold staking, decodable DeFi transaction via ABI, etc. More new features are coming soon. Backup & restore: The recovery phrase can be restored on any Keystone hardware wallet or other compatible wallets that also utilizes seed phrases based on the BIP32/39/44 standards.