OpenAI’s GPT-6 Astra decoded an 82-character German Army Enigma message sent on July 10, 1941, after it remained unsolved for 83 years in Frode Weierud’s CryptoCellar archive. Carter Leffen directed the effort, using the repeated place name Rosenow from a solved related message as a crib. Astra searched archives, built an Enigma simulator, wrote cryptanalysis code, tested about 14.8 million keys in parallel and verified the result through two independent implementations. The recovered setup included rotor order II-V-III and 10 plugboard pairs, while the plaintext said: "Please specify the route of march. I am in Rosenow, Rosenow. Immediate reply by radio." The episode shows AI systems combining research, coding, computation and review under human direction, not autonomous cryptanalytic judgment. Anthropic said in July that its model had found previously undocumented weaknesses in encryption systems. Neither development affects the security of properly generated Bitcoin keys: Enigma is a 1930s rotor cipher, while Bitcoin uses 256-bit keys and the secp256k1 curve. The more immediate cryptocurrency risks remain weak random-number generation, brainwallets, lost seed phrases and unaudited contracts, including a broken pseudorandom-number generator reportedly exposing around 220,000 wallets in October 2025. Leffen said the website documenting the solution required 99 times more work than the codebreaking itself.