Hardware Wallets Companies

SeedSigner is an open-source hardware wallet project that enables users to construct an air-gapped, stateless signing device using a Raspberry Pi Zero 1.3 (non-wireless variant) and commodity components. The device generates and signs Bitcoin transactions entirely offline, with communication to wallet software conducted exclusively through animated QR code exchange, ensuring private keys remain isolated from networked interfaces. The system supports BIP39 seed phrase generation via dice rolls or photographic entropy sources, BIP39 passphrase functionality, native SegWit multisig XPUB generation, and BIP85 child seed derivation. The project includes an open-source 3D-printable enclosure design. The architecture prioritizes air-gapped operation and transaction signing without network connectivity, with all cryptographic operations performed locally on the device. The system is designed for users requiring verifiable, offline key management and multisignature wallet configurations.

Billfodl manufactures physical metal seed phrase backup devices for cryptocurrency wallet recovery. The core product is a marine-grade 316 stainless steel case containing letter tiles that spell out a seed phrase, providing an offline, tamper-resistant storage method as an alternative to paper backups. The device is designed to withstand fire, flood, and physical damage. The product line includes the standard Billfodl unit, a Multishard variant for distributing seed phrases across multiple shards, Faraday bags for radiofrequency shielding, and bundled packages paired with hardware wallets from Trezor and Ledger. The system targets individual cryptocurrency holders who use hardware or software wallets and require durable physical backup solutions. Distribution occurs through authorized resellers.

Burner is a compact NFC-based hardware wallet produced by Arx Research Inc. that supports Bitcoin, Ethereum, and stablecoins including USDC, USDT, and USD II. The device uses secure chips comparable to those in high-end hardware wallets but eliminates seed phrases in favor of PIN-based protection. The wallet operates through BurnerOS, a browser-based operating system that requires no separate application installation. Burner cards connect to decentralized applications via WalletConnect protocol, enabling integration with platforms such as Uniswap and Safe. The devices are available through retail channels including Amazon. The product is designed for both casual users seeking a simple cryptocurrency gift mechanism and users requiring a compact self-custody signing device. A companion product called Terminal enables merchants to accept stablecoin payments through NFC tap functionality.

G-Knot develops a hardware crypto wallet that uses finger-vein biometric authentication in place of traditional passwords and seed phrases, claiming to be the first product of its kind. The device scans subcutaneous vein patterns using near-infrared light and generates a zero-knowledge cryptographic proof stored locally, so no raw biometric data leaves the device or is held by a central authority. The wallet supports up to 24 authentication patterns per user across eight fingers and is designed for individual crypto holders seeking self-custody without the risk of lost recovery phrases. G-Knot also issues a native token, GKNT, intended to serve as a gas and governance token for an associated blockchain layer, with staking rewards and sub-cent transaction fees.