Entropy32 Plus Turns Radioactive Decay Into Bitcoin (BTC) Seed Phrases Offline

Geiger Counter Feeds BIP39 Seeds

An open-source hardware project is turning radioactive decay into Bitcoin (BTC) recovery phrases, converting the unpredictable timing of Geiger counter pulses into standardized seed material without ever touching the internet. Developer Alexander Higgins released the device, nicknamed “The Universe Bifurcator,” as Entropy32 Plus in September 2026, publishing firmware, circuit-board designs, fabrication files and a printable enclosure in the project's repository for independent inspection.

The build chain is deliberately mechanical. A GQ Electronics GMC-320S Geiger counter feeds pulses through a 3.5-millimeter jack into an LM393 comparator, which digitizes the analog signal for an ATmega328P microcontroller. The firmware timestamps each decay event with a microsecond timer and compares consecutive intervals: a longer gap produces a one, a shorter gap a zero, equal intervals are discarded, and readings under 200 microseconds are rejected as potential glitches. Collection stops at 512 bits — double the maximum 256-bit BIP39 input — after which bundled SHA-256 code conditions all 64 bytes; the first 16 bytes map to a 12-word phrase and the full 32 bytes to a 24-word phrase drawn from the standardized 2,048-word list. For a 12-word output, 128 bits of data plus a four-bit checksum are split into twelve 11-bit groups, each selecting one word. The hashing step reuses the same function that secures proof-of-work mining, applied here for conditioning rather than consensus.

Isolation is the design's core claim: no Wi-Fi, no Bluetooth, no persistent storage. Words appear on a 0.91-inch OLED screen operated through two buttons, and a dual-button confirmation overwrites the RAM array after transcription. A startup self-test hashes “abc” and halts if the SHA-256 output deviates from the known vector. Compiled firmware occupies 30,006 of the chip's 30,720 flash bytes, with the BIP39 wordlist alone consuming 13,117 bytes — roughly 43% of capacity.

The limits are equally explicit. The documentation states the entropy source has not been evaluated under NIST SP 800-90B, urges users to verify it or proceed at their own risk, and recommends mixing the Geiger data with an independently validated generator before securing substantial funds. No audit, raw-event dataset or tagged production release existed as of Sept. 13; the initial commit is dated Sept. 4. The stakes are real because modern Bitcoin wallets derive every address from one master seed, so any weakness in the original randomness propagates across all keys generated from it.

Saylor's Bitcoin Investor Guide

Strategy executive chairman Michael Saylor promoted the company's Bitcoin Investor Guide on Sept. 12, presenting Bitcoin as an open, absolutely scarce global reserve asset. The 21-page framework, revised Sept. 7, positions the 21 million supply cap, independent verification and borderless transferability as the foundations of long-term demand, and sketches a future market in which equities, credit, debt, derivatives and currencies form around Bitcoin as digital capital. Saylor has previously argued that corporations, banks, funds and sovereign entities will broaden their holdings — a thesis that echoes the Bitcoin maximalism playbook and, in its state-level variant, the strategic bitcoin reserve model.

The guide is unusually candid about product structure. It separates direct coin ownership from common stock, preferred securities, debt instruments and derivatives, each carrying distinct rights, fees and failure modes, and treats the spot exchange-traded product route — brokerage-held shares backed by coins sitting with a custodian — as a distinct exposure carrying tracking error, expense and corporate-structure risk. Legal classification matters too: a March 17 SEC statement clarified how crypto assets that are not themselves securities can still be offered inside investment contracts, though Strategy labels its own digital-capital terminology conceptual rather than legal. Whether the asset ultimately trades as currency or a digital gold proxy remains contested among institutional allocators.

Custody receives its own risk section. Self-custody shifts private-key, backup and recovery responsibility onto the holder; delegated custody substitutes dependence on a provider's security, solvency and withdrawal policies; and leverage, fees or forced liquidations can produce losses even if the price eventually recovers. The document concedes Bitcoin's price can fall sharply, while the company's own disclosure shows it held 845,050 BTC as of Sept. 7, a figure revealed Sept. 8. For investors weighing that custody trade-off, our best crypto exchanges breakdown covers the custodial alternatives. Readers tracking the market in real time can follow live spot and futures prices on Bybit.

Verification Gaps Define Both Bets

Both stories ultimately hinge on the same act: verification. COINOTAG's reading of the Entropy32 Plus repository — the primary document here — is that its honesty is its defining feature: the README plainly states the Geiger-derived entropy remains unmeasured under NIST SP 800-90B and warns against trusting substantial funds to it before independent review. Strategy's guide makes the mirrored concession, admitting drawdown risk even as it argues scarcity. One project asks users to validate randomness at the key layer; the other asks the broader Bitcoin market to validate a reserve narrative at the balance-sheet layer. Until independent testing and audited disclosures close those gaps, both bets rest on users checking the source themselves.