Claude appears to have solved a long-standing mystery around five unexplained numbers used in NIST elliptic-curve designs. According to a 2026 CoinDesk report, an Anthropic research model traced the values to lrand48, an ordinary pseudo-random-number generator found in older C libraries, using timestamps from 1997 and 1998. It reproduced the published P-256 seed exactly at the 1,842nd candidate. The result makes a deliberately planted weakness less likely, but it does not explain every choice made during the curves’ construction.
The report identifies no reason for users of NIST curves to replace their wallets or cryptographic systems. The seeds were public from the start, and the finding concerns how standardized curve parameters were generated—not private keys created by ordinary users.
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What Claude discovered
NIST adopted several elliptic curves supplied by the NSA around 2000. The curves included unexplained seed values used during parameter generation. Those values were published, but neither NIST nor the NSA provided a convincing account of where they came from.
That missing provenance mattered because elliptic-curve parameters can, in principle, be selected from many candidates. Researchers worried that an agency could search a large set, choose a curve with a hidden weakness, and publish only the final numbers. Anyone without knowledge of the selection process would then be unable to tell whether the curve was safe.
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CoinDesk reports that Claude connected five of the unexplained values to lrand48, a deterministic generator available in older C libraries. The model found sequences produced from timestamps in 1997 and 1998. For the P-256 curve, the sequence generated the published seed at the 1,842nd candidate.
The striking match
The model reached the explanation in less than 30 minutes, according to CoinDesk’s 2026 account. Its recorded reasoning included the line, “Wow, it’s a real discovery.” The report says the model assessed the exact match as having roughly a 20-bit chance, or about 1 in 1,000,000, of occurring by coincidence under its search assumptions. That figure is Claude’s recorded assessment, not a separately published statistical proof.
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Why the numbers became controversial
The concern was never that the seeds were secret. They were public. The concern was that nobody could explain the selection process well enough to rule out an intentional search for a weak construction.
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- Cryptographers Neal Koblitz and Alfred Menezes examined the issue in their 2015 paper A Riddle Wrapped in an Enigma.
- Snowden-era disclosures about efforts to weaken or influence standards made unexplained NSA choices more suspicious.
- NIST later removed the Dual EC random-number generator from its recommendations after a separate backdoor controversy.
- Security researcher Steve Weis pursued public-records requests, while a bounty announced by Filippo Valsorda and contributors remained unsolved until the reported result.
The bounty associated with the search was $36,864, directed to the Internet Security Research Group and Let’s Encrypt.
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How the search worked
- Start without the old theory. An Anthropic employee asked an internal research model to investigate the numbers without telling it the previously suggested explanation involving a forgotten phrase.
- Try ordinary deterministic sources. Claude examined plausible ways that a programmer could have generated public seeds, rather than assuming a sophisticated cryptographic construction.
- Test historical timestamps. It connected the values to
lrand48outputs generated from dates in 1997 and 1998. - Reproduce the published value. Running the sequence for P-256 produced an exact match at candidate 1,842.
This is a reproducible-generation explanation: given the same algorithm, timestamp and search procedure, another investigator can run the program and obtain the same published number. That is substantially different from merely finding a pattern after the fact.
What the finding establishes—and what it does not
| Question | What the report supports |
|---|---|
| Was a hidden NSA weakness proven? | No. The reproducible lrand48 explanation makes an intentionally planted weakness less likely, but it is not proof that every design decision was benign. |
| Were the seeds secret? | No. The values were published with the standards. |
| Were all parameter choices explained? | No. The report says the team still cannot explain why some usable candidates were skipped or how other curve elements were selected. |
| Has the result been independently confirmed? | The available account is CoinDesk’s report of Anthropic’s work; no separate peer-reviewed publication or independent reproduction for this specific discovery was identified. |
Those limits matter. A matching seed answers one important provenance question, but elliptic-curve security depends on the entire construction, not one number in isolation. The unresolved choices do not constitute evidence of a backdoor; they remain unanswered historical questions.
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Does this affect Bitcoin?
Bitcoin uses secp256k1, not the NIST P-256 curve at the center of this investigation. The two curves differ in how their parameters were selected and how much unexplained choice their constructions contain.
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| Comparison | NIST curves discussed in the report | Bitcoin’s secp256k1 |
|---|---|---|
| Who supplied or selected the parameters? | Several curves were supplied by the NSA and adopted by NIST around 2000. | Used by the Bitcoin protocol; it was not part of the NSA seed investigation. |
| Unexplained construction choices | Some seed provenance and candidate-selection decisions remained unclear. | Its simpler construction leaves less room for hidden parameter-selection choices, according to the report. |
| Seed status | The questioned seeds were public. | Not implicated in the reported NSA-seed mystery. |
| Reported user action | No change recommended in the account. | This finding does not call for a Bitcoin wallet change. |
A separate risk sometimes mentioned alongside this story is quantum computing. A sufficiently capable quantum computer could derive a private key from an exposed public key, but the report says no machine currently exists at the required scale. That future scenario is unrelated to the 1997–1998 seed reconstruction.
Should you change your wallet or cryptography?
Not because of this discovery. The report does not identify a compromised wallet, a recoverable user key, or a practical attack against NIST-curve users.
The relevant wallet lesson is about randomness in general. If software generated a private key with a predictable routine such as lrand48, and an attacker could estimate when the key was created, the attacker might reconstruct the key and drain the associated funds. That hypothetical concerns secret wallet-generation inputs. The NSA-related seeds were public standardization values, so their reproducibility does not reveal anyone’s wallet key.
- Keep wallet software current and obtain updates from its authentic publisher.
- Prefer software and hardware that document use of a cryptographically secure random-number generator for key creation.
- Do not treat a public curve seed as a wallet secret or assume this report proves that ordinary wallets used
lrand48. - If a wallet’s documentation or incident history shows that private keys were generated from predictable timestamps or a non-cryptographic generator, move funds using the vendor’s documented recovery procedure.
Why the mystery is not completely closed
The Claude result supplies a concrete, testable origin for the published seeds and reduces the plausibility of the most alarming backdoor theory. It does not provide a complete audit trail for every parameter in every NIST curve. Independent publication and reproduction would help establish how broadly the explanation applies and whether the remaining unexplained choices have ordinary historical causes.
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