Name: Penlock
Brand: Penlock
SKU: 2327
Availability: InStock

Description

Penlock is a paper-based tool for BIP39 seed phrases. It operates using only a pen and the kit to:

Generate new seed phrases offline without electronic devices.
Split existing seed phrases into three cryptographically secure shares.
Recover original seed phrases from any two shares.

Note: This kit only includes worksheets for 12-word seed phrases. But it’s also compatible with 18-word and 24-word phrases.

Secure your Bitcoin autonomy with this low-tech, high-security solution.

Features

Here are a few of the features that make Penlock a fantastic offline solution for your Bitcoin wallet needs:

BIP39 Support

The kit works seamlessly with any BIP39-compatible wallet. This agnostic standard ensures broad compatibility with the majority of existing Bitcoin hardware and software wallet solutions.

Proven Cryptography

A variation of the one-time pad secures the process without complex algorithms or new cryptography. This straightforward, fundamental approach provides mathematically verified security for your backup.

No Electronics Required

A completely manual process eliminates dependency on anything digital, ensuring your seed phrase remains secure from remote hacking, software vulnerabilities, and electronic failure.

Error Correction

Integrated checksums verify the accuracy of each word, while sumtables simplify the recovery process. This system ensures mistakes are easily detected and corrected to prevent fund loss.

Trust-Minimized Inheritance

Shares, including redundant ones, can be distributed to heirs or trusted contacts without exposing the full seed phrase. This approach ensures continuity and access to funds without relying on third-parties.

Fully Auditable

Documentation is publicly available on Github for independent verification. This transparency allows experts to confirm the integrity of the process without relying on proprietary claims.

Getting Started with Penlock

To create your secure seed phrase backup, you’ll need:

Your Penlock kit
A pen (not included)

The process varies by task: Generation takes approximately 30 minutes, and splitting takes roughly 100 minutes for 12-word phrases.

Recovery takes about 60 minutes.

FAQ

Below are answers to some frequently asked questions about Penlock:

Using Penlock for seed generation protects against supply chain attacks. You create entropy manually rather than trusting a black-boxed secure element.

This proven method removes the risk of compromised hardware or hidden backdoors that can be found in electronic devices. It ensures the private keys are truly random and generated in a verifiable, transparent way.

You maintain full control over the creation process from start to finish.

Splitting a seed phrase with Penlock eliminates the single point of failure inherent in standard backups. It hardens your security posture by distributing risk across multiple locations.

This approach mirrors the robustness of a 2-of-3 multisig setup without requiring complex software. A single compromised share reveals nothing about your private keys. You maintain access to funds even if one share is lost or stolen, providing superior protection for long-term storage.

Yes, the kit is fully reusable. You can generate and split multiple seed phrases using the same set of instructions and wheel.

If you require new worksheets, you can download and print additional copies directly from the GitHub repository. This flexibility allows you to secure multiple wallets or create new backups without purchasing new kits.

The kit includes a detailed guide for seed phrase recovery.

If you lost it, the open-source design guarantees long-term accessibility. All necessary documents are available for download, and the GitHub repository allows anyone to fork or clone the code.

The official website is also archived on archive.org.

As long as a copy exists, the tool remains functional. This resilience mirrors Bitcoin’s philosophy: the system persists without central coordination or a single point of failure.

Orders are processed and shipped as quickly as possible. If you need to cancel, or modify, your order, fill out the contact form on the Support page as soon as possible. Every effort will be made to accommodate your request, but please note that it may not be possible to cancel orders that have already been processed or shipped. In such cases, you may need to follow the Refund and Return Policy instead.

Additional information

Weight	106 g
Dimensions	320 × 240 × 2.5 mm
Material	Paper
Compatibility	BIP39 (12-, 18-, and 24-word recovery phrases)
In the envelope	1 x wheel 1 x tile sheet with ziplock bag 2 x worksheets 1 x recovery cheat sheet 3 x sumtables sheets 4 x wordlist sheets