Bitcoin wallet keys emerge from radioactive decay

An open-source Bitcoin seed generator has converted radioactive decay events into 12-word and 24-word BIP39 recovery phrases using an offline hardware device.

The Entropy32 Plus repository, published by developer Alexander Higgins in September 2026, contains the project’s firmware, circuit-board designs, fabrication files and printable enclosure. Higgins describes the device as an experimental, educational project and warns users not to trust it with substantial funds before an independent review.

Known as “The Universe Bifurcator,” the device takes pulses from a Geiger counter and measures the time between detected events. Its firmware converts comparisons between consecutive intervals into bits, collects a 512-bit input pool and processes the data with SHA-256.

Entropy32 Plus then formats part of the resulting hash as a standard BIP39 recovery phrase. The device operates without Wi-Fi, Bluetooth or persistent seed storage, according to its published design.

Entropy32 Plus measures time between radiation events

Radioactive decay occurs unpredictably at the level of individual atoms. Entropy32 Plus uses the timing of detected decay events as its physical source of randomness instead of relying solely on a software-generated value.