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New open-source device uses radioactive decay to generate Bitcoin seed phrases offline.

Others
13 Sep 2026
Crypto news
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New open-source device uses radioactive decay to generate Bitcoin seed phrases offline.

Entropy32 Plus is an open-source hardware device that generates Bitcoin BIP39 recovery phrases by converting the timing of radioactive decay events into entropy. It uses a Geiger counter to capture decay pulses, processes the timing intervals into bits, and applies SHA-256 hashing to produce 12- or 24-word seed phrases offline. The device operates without wireless connections and does not store seeds persistently, enhancing security by keeping the process offline. However, the entropy quality has not yet been independently validated or tested under NIST standards, and the developer advises caution before using it for significant funds.

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