Entropy32 Plus Uses Radioactive Decay to Generate Bitcoin Wallet Keys

How Radioactive Decay Enhances Key Generation Security

An open-source hardware device named Entropy32 Plus has been developed to generate Bitcoin recovery phrases using radioactive decay as an entropy source. Created by independent developers and released in September 2026, the device operates offline and converts timing variations from radioactive events into BIP39-compliant 12-word or 24-word seed phrases. The project aims to provide a tamper-resistant method for generating cryptographic keys without relying on digital random number generators.

The device uses a small radioactive isotope embedded in a shielded sensor to detect decay events. The precise timing between these random nuclear emissions is measured and processed through a cryptographic hash function to produce entropy. This entropy is then used to derive Bitcoin private keys in accordance with the BIP39 standard. Because the process occurs entirely offline and does not require internet connectivity or firmware updates, the developers claim it reduces exposure to software-based attacks or supply chain compromises.

Can This Method Be Trusted for Long-Term Bitcoin Storage?

Radioactive decay is inherently unpredictable at the quantum level, making it a high-quality source of true randomness. Unlike pseudorandom number generators used in most electronics, which can be predictable if the algorithm or seed is known, decay-based entropy resists replication. The Entropy32 Plus team tested the device over several weeks, confirming that the timing intervals passed statistical randomness tests including entropy estimates and compression resistance. They emphasize that the hardware design prevents side-channel leakage by isolating the sensor from processing components.

The developers acknowledge that while the entropy source is robust, user responsibility remains critical. The device does not store keys; it only displays the generated phrase once, requiring users to write it down manually. They recommend combining the output with additional security practices such as metal backups and geographic distribution. Independent auditors have not yet reviewed the hardware, though the source code is publicly available on a code repository under an open-source license. The team plans to submit the design for formal evaluation by cryptographic hardware experts in early 2027.

How does the device ensure the radioactive material is safe? The isotope used emits low-energy radiation and is enclosed in multiple layers of shielding, making external exposure negligible and well within safety limits for consumer handling.

Frequently Asked Questions

Is the device resistant to electromagnetic interference? Yes, the timing circuitry is analog and isolated, with shielding designed to block external electromagnetic fields that could interfere with decay detection measurements.

What happens if the device fails during use? Since the device only displays the phrase once and does not retain data, failure after generation does not compromise security. Users are advised to verify the phrase immediately and create multiple backups.