Bitcoin Wallet Keys Generated from Radioactive Decay

An open-source Bitcoin seed generator uses radioactive decay to create BIP39 recovery phrases. The Entropy32 Plus project, developed by Alexander Higgins, leverages a Geiger counter to capture radiation events and generate entropy.

The device measures the time between detected events, processing comparisons between consecutive intervals into bits. It then collects 512-bit input pools and conditions the data with SHA-256 hashing.

Once processed, the firmware formats part of the resulting hash as a standard BIP39 recovery phrase. The device operates offline, without Wi-Fi or Bluetooth connectivity, and does not store seed phrases persistently.

The project's documentation warns users to verify the entropy source before using it for valuable funds. Higgins recommends mixing Geiger-derived data with another independently validated source to ensure sufficient entropy.