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Note that there are plenty of red herrings too.\tsource: https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Fblob\u002Fmain\u002F2-mid-prizes\u002Fkeir-finlow-bates-blockchain-book-600ksats\u002Fclues\u002Fauthor-posts.md\n\tofficial\t-\tIn many cases, you'll have to hash the answer three times.\tsource: https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Fblob\u002Fmain\u002F2-mid-prizes\u002Fkeir-finlow-bates-blockchain-book-600ksats\u002Fclues\u002Fauthor-posts.md\n\tcommunity\t2026-08-16\tThe book plants the number 221 with a \"check it on your calculator\" nudge in one chapter and titles a section \"Elementary, my dear Watson\" in another.\tsource: https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Ftree\u002Fmain\u002F2-mid-prizes\u002Fkeir-finlow-bates-blockchain-book-600ksats\tanswer: 221B Baker Street\tanswer source: https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Ftree\u002Fmain\u002F2-mid-prizes\u002Fkeir-finlow-bates-blockchain-book-600ksats\tanswer date: 2026-08-16\nexplorer: https:\u002F\u002Fblockstream.info\u002Faddress\u002F14aFhno96fkt7knLWMDQ4j8yh8v5hBF4n1\nsource: https:\u002F\u002Fkf106.medium.com\u002Feveryone-loves-a-treasure-hunt-93885ae8d80a","en-easy-1",false,true,[513,516,519],{"label":514,"value":515,"mono":511},"private key (hex)","72048596fda6013a976c22ac4d0b1dbc29a3ca624f4740a64b195ad10f4e1b89",{"label":517,"value":518,"mono":511},"WIF","5JgW1WrxCgC4275UqHQfTVpdnyEPJDaaSf76VPCC7Q6KX14Cunc",{"label":520,"value":521,"mono":511},"passphrase","221B Baker Street",[523,527],{"type":524,"txid":525,"date":497,"amount":495,"url":526},"funding","f26ecab737b701982a7a3d0f9b0ffb3c509225cbbefecc2a4fe2e73758ce8972","https:\u002F\u002Fblockstream.info\u002Ftx\u002Ff26ecab737b701982a7a3d0f9b0ffb3c509225cbbefecc2a4fe2e73758ce8972",{"type":528,"txid":529,"date":498,"amount":530,"url":531},"claim","5a4eb010ab4aa23a3946d50a602276551e160042862e95c793e384c5d8cf8011","0.0019888 BTC","https:\u002F\u002Fblockstream.info\u002Ftx\u002F5a4eb010ab4aa23a3946d50a602276551e160042862e95c793e384c5d8cf8011",[],[534,538,540],{"kind":535,"text":536,"source":537,"shared":510},"official","You hold the source of each and every key in your hands... as long as you have a physical copy, that is. Note that there are plenty of red herrings too.","https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Fblob\u002Fmain\u002F2-mid-prizes\u002Fkeir-finlow-bates-blockchain-book-600ksats\u002Fclues\u002Fauthor-posts.md",{"kind":535,"text":539,"source":537,"shared":510},"In many cases, you'll have to hash the answer three times.",{"kind":541,"text":542,"source":543,"date":544,"answer":545,"shared":510},"community","The book plants the number 221 with a \"check it on your calculator\" nudge in one chapter and titles a section \"Elementary, my dear Watson\" in another.","https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Ftree\u002Fmain\u002F2-mid-prizes\u002Fkeir-finlow-bates-blockchain-book-600ksats","2026-08-16",{"text":521,"source":543,"date":544},[547],{"name":548,"source":543,"scope":549},"triple-sha256-brainwallet","puzzle","{\n  \"id\": \"move-over-brokers\u002Fen-easy-1\",\n  \"chain\": \"bitcoin\",\n  \"address\": {\n    \"value\": \"14aFhno96fkt7knLWMDQ4j8yh8v5hBF4n1\",\n    \"kind\": \"p2pkh\",\n    \"hash160\": \"273260b4f01b31f6cea8d064a3bbbfa7d1302e76\"\n  },\n  \"status\": \"solved\",\n  \"pubkey\": {\n    \"value\": \"0479b1b086e28ab7c7f98efb60103b5e0cc01cee15f037dcc616dd49ffc17f9f2516d784f8414813247abeaefe6cd6388df2463cf5df99618aacc9e9c6cb219f1b\",\n    \"format\": \"uncompressed\"\n  },\n  \"key\": {\n    \"hex\": \"72048596fda6013a976c22ac4d0b1dbc29a3ca624f4740a64b195ad10f4e1b89\",\n    \"wif\": {\n      \"decrypted\": \"5JgW1WrxCgC4275UqHQfTVpdnyEPJDaaSf76VPCC7Q6KX14Cunc\",\n      \"passphrase\": \"221B Baker Street\"\n    },\n    \"derived\": true\n  },\n  \"prize\": 0.002,\n  \"start_date\": \"2020-11-28 16:24:07\",\n  \"solve_date\": \"2022-01-15 06:48:31\",\n  \"solve_time\": 35648664,\n  \"source_url\": \"https:\u002F\u002Fkf106.medium.com\u002Feveryone-loves-a-treasure-hunt-93885ae8d80a\",\n  \"transactions\": [\n    {\n      \"tx_type\": \"funding\",\n      \"txid\": \"f26ecab737b701982a7a3d0f9b0ffb3c509225cbbefecc2a4fe2e73758ce8972\",\n      \"date\": \"2020-11-28 16:24:07\",\n      \"amount\": 0.002\n    },\n    {\n      \"tx_type\": \"claim\",\n      \"txid\": \"5a4eb010ab4aa23a3946d50a602276551e160042862e95c793e384c5d8cf8011\",\n      \"date\": \"2022-01-15 06:48:31\",\n      \"amount\": 0.0019888\n    }\n  ],\n  \"solver\": {\n    \"addresses\": [\n      \"19HBFLhjcoi49jNVe3r7T555rfzPGpeXN3\"\n    ]\n  },\n  \"hints\": [\n    {\n      \"kind\": \"official\",\n      \"text\": \"You hold the source of each and every key in your hands... as long as you have a physical copy, that is. Note that there are plenty of red herrings too.\",\n      \"source\": \"https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Fblob\u002Fmain\u002F2-mid-prizes\u002Fkeir-finlow-bates-blockchain-book-600ksats\u002Fclues\u002Fauthor-posts.md\"\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"In many cases, you'll have to hash the answer three times.\",\n      \"source\": \"https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Fblob\u002Fmain\u002F2-mid-prizes\u002Fkeir-finlow-bates-blockchain-book-600ksats\u002Fclues\u002Fauthor-posts.md\"\n    },\n    {\n      \"kind\": \"community\",\n      \"text\": \"The book plants the number 221 with a \\\"check it on your calculator\\\" nudge in one chapter and titles a section \\\"Elementary, my dear Watson\\\" in another.\",\n      \"source\": \"https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Ftree\u002Fmain\u002F2-mid-prizes\u002Fkeir-finlow-bates-blockchain-book-600ksats\",\n      \"date\": \"2026-08-16\",\n      \"answer\": {\n        \"text\": \"221B Baker Street\",\n        \"source\": \"https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Ftree\u002Fmain\u002F2-mid-prizes\u002Fkeir-finlow-bates-blockchain-book-600ksats\",\n        \"date\": \"2026-08-16\"\n      }\n    }\n  ],\n  \"techniques\": [\n    {\n      \"name\": \"triple-sha256-brainwallet\",\n      \"source\": \"https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Ftree\u002Fmain\u002F2-mid-prizes\u002Fkeir-finlow-bates-blockchain-book-600ksats\"\n    }\n  ]\n}",[],"move-over-brokers\u002Fen-easy-2",1,12,null,1791479589704]