Questions behind
the procedure.

It provides an opinionated, start-to-finish process for creating and operating a Bitcoin Core multisig vault, while explaining the key-management trade-offs behind that process. It is intended to be followable by people without deep technical experience.

The design keeps security-critical dependencies deliberately narrow. Linux and Bitcoin Core are mature, open-source projects with conservative review practices, so the arrangement avoids reimplementing wallet functions or adding unnecessary third-party libraries.

Additional applications can improve convenience, but every dependency adds code, update processes and suppliers that must be trusted. Yeti 2.0 chooses a smaller stack as a security trade-off; that does not mean every alternative is inherently unsafe.

Yes. No human-made software is guaranteed to be free of mistakes or malicious changes. The strategy is to reduce dependencies and rely on well-scrutinised projects with strong change-control processes—not to claim that vulnerabilities are impossible.

The Yeti 2.0 design avoids specialised wallet hardware and its firmware, manufacturing and supply-chain dependencies. It instead accepts the different trust assumptions and operational complexity of dedicated commodity computers running self-installed Linux and Bitcoin Core.

Bitcoin Core does not use BIP39 seed phrases. This native multisig arrangement depends on wallet descriptors and wallet keys together, so each archival backup stores a Bitcoin Core key wallet plus the watch-wallet descriptor rather than a handwritten seed phrase.

M-Disc and archival-grade gold DVDs are designed for long-lived storage and resist some environmental degradation better than ordinary recordable media. They still require careful storage, periodic inspection and eventual replacement; the Yeti 2.0 FAQ suggests checking and remaking backups at least every decade, and sooner in poor conditions.

Multisig changes the failure model: one exposed key backup cannot spend funds by itself. Seven separate backups provide redundancy while any three form a signing quorum. The Yeti 2.0 FAQ discourages hand-copying descriptors and keys because transcription is difficult and error-prone.

The guide relies on Linux and Bitcoin Core to combine operating-system, hardware and environmental entropy through established cryptographic random-number systems. Its reasoning is that if this software cannot be trusted to generate keys, it also cannot be trusted to use hand-supplied entropy safely.

Seven keys allow four backups to be lost while preserving recovery. Requiring three signatures makes the theft of one—or even two—backups insufficient. This is Yeti 2.0’s opinionated balance between resilience, attack resistance and operating complexity.

The offline computer uses an Ubuntu live session whose working state is held in volatile memory, and the guide disables swap so secrets are not intentionally written to an internal swap area. Powering off clears the live session. The Yeti 2.0 FAQ describes removing internal drives as an optional, more extreme precaution.

The Yeti 2.0 authors do not recommend this design above that amount. They suggest that higher-value arrangements need more scrutiny and additional measures, such as encrypted material and keys generated across multiple computers. Ice Core does not provide that higher-assurance procedure.

The backed-up wallet descriptor is not encrypted. Someone who obtains one backup may be able to reconstruct the watch-only wallet and inspect its balance and history, even though one backup alone cannot spend the bitcoin.

Encryption creates another set of secrets that must themselves be backed up and recovered correctly. A robust layered-encryption design is possible, but it materially increases complexity and is outside this guide.

Generating keys on separate computers can reduce common-mode risk, but requires substantially more hardware and many more transfers. The Yeti 2.0 design accepts one dedicated offline computer as a practical compromise; higher-assurance arrangements should revisit this assumption.

One option is to load and use only one key per live boot, moving the PSBT into a fresh session for each signature. This avoids holding a signing quorum in one session but adds repeated boots and transfers, so it is not part of the current procedure.

Create a new multisig vault and move all funds to it. Clearly distinguish old and new media, and avoid a suspected backup when sweeping unless no alternative exists. Individual cases and envelopes can add basic physical protection.

The software permits other thresholds, but the guide’s commands and recovery model are specifically designed for 3-of-7. Changing the threshold means departing from the reviewed procedure and taking responsibility for a new set of trade-offs.

Yes. The Yeti 2.0 FAQ recommends an inexpensive CD-R for a practice run only, never for a real-value vault. Before the real run, remove the test watch wallet from the online node and reboot the offline computer to clear its temporary state, then repeat the procedure with archival media.

The signing keys are not held by the online node. Rebuild it by repeating A1–A4, recover multisig_watch_wallet from any backup disc through the offline computer and transfer it to the replacement node as described in B5.

They are possible adaptations, but not part of the tested path. Tor can make initial blockchain synchronisation slower, while Tails adds another live-system preparation workflow. Any variant needs end-to-end testing in the context of the complete guide.

Not for the procedure as written. The watch descriptor is created offline and later loaded into the online node, while loading the wallet still depends on full background validation. A different reconstruction workflow might benefit, but it is outside this guide.