Keystone
Keystone makes an open source, air-gapped hardware wallet for storing cryptocurrency private keys offline. The device uses a 4-inch touchscreen display, PCI-grade tamper-resistant chips, and has no network connectivity, signing transactions offline to avoid exposure to online threats. It connects with software wallets such as MetaMask and OKX Wallet, and supports major cryptocurrencies including Bitcoin and Ethereum, with a Bitcoin-only firmware option also available.
The wallet generates a seed phrase during setup, which customers back up offline; funds can be restored on a new Keystone device or any BIP39-compatible wallet using that seed phrase. Keystone also sells physical accessories, including steel plates for mnemonic backup and a Keystone Tablet for offline storage of recovery phrases.
This listing is our own opinion. We are not affiliated with Keystone beyond any commercial relationship disclosed above, we never take custody of your assets, and nothing here is financial advice. Verify anything that matters against the company's own site before acting on it.