Glacier is a free, open-source, step-by-step protocol for storing bitcoin offline in a highly secure way using multiple keys. It is self-managed by design, so no third-party service or fee is involved, and it documents several approaches to keeping keys offline.
Source: Official website. Last checked 2026-09-18. Spot an error? Tell us.
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Yeti is an open-source script and set of instructions that installs Bitcoin Core and then walks the user through building a multi-key cold storage setup. It deliberately prioritises safety over convenience and does not rely on any third-party service.
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.
Base58 is a bitcoin protocol school offering online and in-person courses that run from beginner fundamentals to application development and advanced research topics. Tracks cover wire protocols, transaction construction and developer basics.
Billfodl's multi-unit kit for splitting a recovery phrase across several steel devices, aimed at Shamir-style or multi-location backup schemes. Uses the same stainless steel tile system as the standard Billfodl.
A Swiss-engineered hexagonal metal bar with grooves on all six sides that hold pre-engraved letter tiles, so no stamping tools are needed. Weighs 515g, works with 12 or 24-word BIP39 phrases, and ships with over 2,000 tiles. BitBar also sells polymer backup cards and special-character tile sets.
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.