Bitkey is a bitcoin-only 2-of-3 multisig wallet combining a hardware device, a mobile app key and a server key, so there is no seed phrase to write down. The design includes built-in inheritance and recovery flows while the owner keeps control of spending.
Source: Official website. Last checked 2026-09-18. Spot an error? Tell us.
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CKBunker is Coinkite's open-source software for running a Coldcard in HSM mode so transactions can be authorised over Tor according to a preset policy. It is aimed at teams and businesses that need policy-controlled signing while retaining their own keys.
Krux is open-source firmware that turns off-the-shelf Kendryte K210 devices into airgapped bitcoin transaction signers, commonly used as one of the signers in a multisig setup. It also provides tooling for creating, encrypting and recovering mnemonic backups.
The 10x Security Bitcoin Guide walks a non-coding but tech-savvy audience through setting up bitcoin storage with no single point of failure using multisig. Its premise is that a fault-tolerant setup lets you survive one or more catastrophic mistakes that would be fatal in a single-key system.
AnchorWatch pairs its Trident Vault bitcoin custody technology with optional Lloyd's of London insurance. Customers can choose a Flagship model where they hold their own private keys alongside AnchorWatch, or a multi-institution model that distributes keys across three institutions.
Two engraved stainless steel sheets from Swiss maker Shift Crypto, holding up to 24 recovery words at 12 per sheet. An automatic puncher is included and only the first four letters of each BIP39 word need marking. Made in the EU with a two-year warranty.
Shift Crypto's heavy-duty reusable backup, built from thick stainless steel with a screw closure and tamper-evident sticker. Because it uses rearrangeable character tiles rather than punched marks, the stored phrase can be updated at any time.