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https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002Fcomment\u002Fen6e73r\u002F (MD5 of the second key the Wattpad master string derives)\nstarted: 2019-05-12 00:29:20\nsolved: 2019-05-12 02:22:37 (1h 53m)\ntransactions: 2\n\tfunding\t2019-05-12 00:29:20\t0.077 BTC\tc5e59f1e8b7218c76a9029bb16c0085028095ac3527ebc3e1f964b1d12d87f24\n\tclaim\t2019-05-12 02:22:37\t0.0769 BTC\tc1e362deff1954846810ffa15044f49ee94a382e6a2075721cec198a6260d6f9\nclaim: https:\u002F\u002Fblockstream.info\u002Ftx\u002Fc1e362deff1954846810ffa15044f49ee94a382e6a2075721cec198a6260d6f9\nhints: 4\n\tofficial\t-\tIt has no question right now, which is why it is difficult.\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002Fcomment\u002Fen66xg8\u002F\tanswer: This was just using the puzzle string in the latest Wattpad chapter on quizchain as a password manager in exactly the way it was described there and then pick the second private key under that puzzle string.\tanswer source: https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002F77_mbtc_quizchain2_block_2\u002F\n\tofficial\t-\tFormat: [solution]\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002F77_mbtc_quizchain2_block_2\u002F\tanswer: L5Z66qPmUkTAsWQywjRNHDxHrX6J1X1SQedp6V8QsbaXR7rGd6ex\tanswer source: https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002Fcomment\u002Fen6e73r\u002F\n\tofficial\t-\tThis solution does not need a TOMI field. And it also does not need a link, since it is sufficiently strong as a password to make brute forcing it impossible on its own.\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002F77_mbtc_quizchain2_block_2\u002F\n\tofficial\t-\tUpdate: First three digits of MD5 hash are 7b4.\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002F77_mbtc_quizchain2_block_2\u002F\nexplorer: https:\u002F\u002Fblockstream.info\u002Faddress\u002F13qUHVzMYAneyyBGYvEey4SHy2iMSz3Jzh\nsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002F77_mbtc_quizchain2_block_2\u002F","2",false,[418,422,425],{"label":419,"value":420,"mono":421},"WIF","KzFB7hBGmLBqm8nqVCVLBmgyd1NxnoJXZUhE377QL4T2iy5rw4Wz",true,{"label":423,"value":424,"mono":421},"entropy hash","7b44cc11c866ab85b7078c43ad6795e1",{"label":426,"value":427,"mono":416,"href":428},"entropy source","MD5 of the second key the Wattpad master string derives","https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002Fcomment\u002Fen6e73r\u002F",[430,434],{"type":431,"txid":432,"date":403,"amount":401,"url":433},"funding","c5e59f1e8b7218c76a9029bb16c0085028095ac3527ebc3e1f964b1d12d87f24","https:\u002F\u002Fblockstream.info\u002Ftx\u002Fc5e59f1e8b7218c76a9029bb16c0085028095ac3527ebc3e1f964b1d12d87f24",{"type":435,"txid":436,"date":404,"amount":437,"url":438},"claim","c1e362deff1954846810ffa15044f49ee94a382e6a2075721cec198a6260d6f9","0.0769 BTC","https:\u002F\u002Fblockstream.info\u002Ftx\u002Fc1e362deff1954846810ffa15044f49ee94a382e6a2075721cec198a6260d6f9",[],[],[442,448,452,454],{"kind":443,"text":444,"source":445,"answer":446,"shared":416},"official","It has no question right now, which is why it is difficult.","https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002Fcomment\u002Fen66xg8\u002F",{"text":447,"source":412},"This was just using the puzzle string in the latest Wattpad chapter on quizchain as a password manager in exactly the way it was described there and then pick the second private key under that puzzle string.",{"kind":443,"text":449,"source":412,"answer":450,"shared":416},"Format: [solution]",{"text":451,"source":428},"L5Z66qPmUkTAsWQywjRNHDxHrX6J1X1SQedp6V8QsbaXR7rGd6ex",{"kind":443,"text":453,"source":412,"shared":416},"This solution does not need a TOMI field. And it also does not need a link, since it is sufficiently strong as a password to make brute forcing it impossible on its own.",{"kind":443,"text":455,"source":412,"shared":416},"Update: First three digits of MD5 hash are 7b4.","{\n  \"id\": \"quizchain2\u002F2\",\n  \"chain\": \"bitcoin\",\n  \"address\": {\n    \"value\": \"13qUHVzMYAneyyBGYvEey4SHy2iMSz3Jzh\",\n    \"kind\": \"p2pkh\",\n    \"hash160\": \"1f1afe612677b8168b10d470c1bacc26ecf732d8\"\n  },\n  \"status\": \"solved\",\n  \"pubkey\": {\n    \"value\": \"03f2632ecf5c36d83e97c02db9b2140336580bc43a6478c1625b9522fce483faf1\",\n    \"format\": \"compressed\"\n  },\n  \"key\": {\n    \"wif\": {\n      \"decrypted\": \"KzFB7hBGmLBqm8nqVCVLBmgyd1NxnoJXZUhE377QL4T2iy5rw4Wz\"\n    },\n    \"seed\": {\n      \"entropy\": {\n        \"hash\": \"7b44cc11c866ab85b7078c43ad6795e1\",\n        \"source\": {\n          \"url\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002Fcomment\u002Fen6e73r\u002F\",\n          \"description\": \"MD5 of the second key the Wattpad master string derives\"\n        }\n      }\n    }\n  },\n  \"prize\": 0.077,\n  \"start_date\": \"2019-05-12 00:29:20\",\n  \"solve_date\": \"2019-05-12 02:22:37\",\n  \"solve_time\": 6797,\n  \"source_url\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002F77_mbtc_quizchain2_block_2\u002F\",\n  \"transactions\": [\n    {\n      \"tx_type\": \"funding\",\n      \"txid\": \"c5e59f1e8b7218c76a9029bb16c0085028095ac3527ebc3e1f964b1d12d87f24\",\n      \"date\": \"2019-05-12 00:29:20\",\n      \"amount\": 0.077\n    },\n    {\n      \"tx_type\": \"claim\",\n      \"txid\": \"c1e362deff1954846810ffa15044f49ee94a382e6a2075721cec198a6260d6f9\",\n      \"date\": \"2019-05-12 02:22:37\",\n      \"amount\": 0.0769\n    }\n  ],\n  \"hints\": [\n    {\n      \"kind\": \"official\",\n      \"text\": \"It has no question right now, which is why it is difficult.\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002Fcomment\u002Fen66xg8\u002F\",\n      \"answer\": {\n        \"text\": \"This was just using the puzzle string in the latest Wattpad chapter on quizchain as a password manager in exactly the way it was described there and then pick the second private key under that puzzle string.\",\n        \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002F77_mbtc_quizchain2_block_2\u002F\"\n      }\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"Format: [solution]\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002F77_mbtc_quizchain2_block_2\u002F\",\n      \"answer\": {\n        \"text\": \"L5Z66qPmUkTAsWQywjRNHDxHrX6J1X1SQedp6V8QsbaXR7rGd6ex\",\n        \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002Fcomment\u002Fen6e73r\u002F\"\n      }\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"This solution does not need a TOMI field. And it also does not need a link, since it is sufficiently strong as a password to make brute forcing it impossible on its own.\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002F77_mbtc_quizchain2_block_2\u002F\"\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"Update: First three digits of MD5 hash are 7b4.\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbnj24w\u002F77_mbtc_quizchain2_block_2\u002F\"\n    }\n  ]\n}","quizchain2\u002F1","quizchain2\u002F3",10,{"id":461,"title":415,"body":462,"description":521,"extension":525,"meta":526,"navigation":421,"path":527,"seo":528,"stem":394,"__hash__":529},"stories\u002Fquizchain2\u002F2.md",{"type":463,"value":464,"toc":520},"minimark",[465,470,474,485,489,497,514,517],[466,467,469],"h2",{"id":468},"no-question-at-all","No question at all",[471,472,473],"p",{},"Half an hour into May 12, the second 77 mBTC block. Why 77 again? Because of the mistake in block 77 of the first run. The author was quite sure this one couldn't break: \"I don't see any way I could possibly screw this one up.\" Famous last words? Not this time, actually. Block 2 held.",[471,475,476,477,480,481,484],{},"The post has no question. Just ",[478,479,449],"code",{},". No TOMI, no link, because the solution is \"sufficiently strong as a password\". People asked where the question was. \"It has no question right now, which is why it is difficult.\" Later an update gave the MD5 prefix, ",[478,482,483],{},"7b4",".",[466,486,488],{"id":487},"a-password-manager-from-wattpad","A password manager from Wattpad",[471,490,491,492,496],{},"u\u002FQuantris got it in under two hours. The claim confirmed at ",[493,494,495],"strong",{},"02:22:37 UTC",". Then came the walkthrough, and it's a good one.",[471,498,499,500,503,504,507,508,510,511,484],{},"The author's Wattpad story has a chapter called \"Quizchain as a Password Manager\". Its example master string is ",[478,501,502],{},"\"BaSCifCatfAaa1i\"Metamon",". Run it the way the chapter says. MD5 gives ",[478,505,506],{},"2941774a…d1d53d91",". That's BIP39 entropy, and the wallet's second key is ",[478,509,451],{},". That key is the solution. Hash it with MD5 again and you get the block's entropy, ",[478,512,513],{},"7b44cc11…ad6795e1",[471,515,516],{},"Why the second key? Because it's block 2. One player said they tried exactly this \"in the first 30 seconds\", with the first key. Ouch.",[471,518,519],{},"Quantris printed the final key too, so the record quotes it instead of deriving it. And \"completely overkill\"? That's a wink back at the Wattpad chapter.",{"title":521,"searchDepth":413,"depth":413,"links":522},"",[523,524],{"id":468,"depth":413,"text":469},{"id":487,"depth":413,"text":488},"md",{},"\u002Fquizchain2\u002F2",{"description":521},"e6-QDJSJIHI_Pk0BZxwpJMgXRAKbdx20tgPB4m6XksA",1790876849643]