ClavaStack

ClavaStack is a Bitcoin-focused brand offering open-source hardware wallets designed to give users greater control over self-custody. Its flagship Specter wallet combines a smartphone-sized 4-inch touchscreen with QR-code communication, allowing air-gapped operation without Bluetooth or Wi-Fi. The device supports Bitcoin multisignature setups, advanced Miniscript features, and BIP-85 seed derivation, while its open-source firmware and hardware designs can be inspected and verified by the community.

ClavaStack’s product range includes the Specter DIY kit for users who want to assemble and configure their own device, plus Specter Shield Lite and Specter Shield Metal models with additional features such as swappable smartcards. These cards let individuals, families, or small teams keep separate, encrypted seeds on one wallet. The brand also provides manuals and tools, and its hardware is compatible with several Bitcoin wallet applications, including Sparrow, Specter Desktop, Liana, Nunchuk, and Bitcoin Safe. Security features include a secure bootloader, personal anti-phishing words, and tamper-evident packaging with blockchain-verifiable order proof.