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Modulo key

Modulo key

฿0.00418227 ≈ $265.00 USD

Generate your key in its permanent physical form — no transcription, no software, no supply-chain uncertainty. Just physics and steel.

Multi-generational bitcoin storage without intermediaries or third parties, celebrating Satoshi Nakamoto’s original vision of transactional freedom.

For bitcoin, for nostr, for networks, for anything that runs on keys and requires entropy.

Choose key type

Getting started guide

Details

The Modulo Key is a physical entropy generator and permanent stainless steel backup for Bitcoin private keys.

Rather than relying on electronic random number generators, the Modulo Key allows entropy to be created through the physical assembly of individual bits. Once assembled, the device itself becomes the long-term backup of the generated key.

Designed for fully offline operation, the Modulo Key is compatible with the BIP-39 standard and can be used with many popular Bitcoin wallets and signing devices.

Available in two versions:

Mini — 128-bit entropy (12-word BIP-39 equivalent)

Standard — 256-bit entropy (24-word BIP-39 equivalent)

Whether you’re creating your first seed or adding another layer of confidence to your self-custody setup, the Modulo Key offers a unique approach that combines entropy generation and durable backup in a single physical object.

Technical specifications

Built to last centuries.

Materials & construction
Material
SUS304/316 Stainless Steel — same alloys used in nuclear reactors and ocean environments
Case thickness
4mm steel walls — protective case included with 256-bit key
Electronics
Zero — fully offline, immune to hacking, malware, and electronic failure
Lifespan
Multi-generational — engineered for permanence across centuries
Cryptography
Key space
2^256 possible keys — 115 quinvigintillion+ unique combinations
Entropy source
Physical random assembly — no software, no network, no manufacturing risk
256-bit key
Key length
133mm assembled
Diameter / weight
28mm — 357g
Threading
M6x1.0
Case dimensions
141x60mm — 1,196g
128-bit MINI key
Key length
55mm assembled
Diameter / weight
14mm — 36.7g
Threading
M5x0.8
Case dimensions
60x25mm — 107.8g

Specifications

Versions

256-bit key │ 128-bit MINI key

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