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and winner explained in comments that he already anticipated that, so the only time he needed was to run the Coleman tool.\tanswer source: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5xj38\u002F7_mbtc_quizchain2_block_51\u002F\n\tofficial\t-\tFirst three digits of MD5 hash are 4c4.\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5xj38\u002F7_mbtc_quizchain2_block_51\u002F\nexplorer: https:\u002F\u002Fblockstream.info\u002Faddress\u002F17EPFGMydd2suYjbNShHrFYzj41JGUHTVa\nsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5xj38\u002F7_mbtc_quizchain2_block_51\u002F\nfiles: 0 files, 3 archived sources; puzzles_assets lists them and reads one by its path","51",false,true,[512,515,518],{"label":513,"value":514,"mono":510},"WIF","Kx5RaMi7KbKxouzMdEoszZDuGfLnn8aNEAx1xE8CJrsxBZGkStyY",{"label":516,"value":517,"mono":510},"entropy 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tool.",{"kind":534,"text":539,"source":505,"shared":509},"First three digits of MD5 hash are 4c4.",[541],{"name":542,"source":505,"scope":543},"md5-to-bip39-entropy","puzzle","{\n  \"id\": \"quizchain2\u002F51\",\n  \"chain\": \"bitcoin\",\n  \"address\": {\n    \"value\": \"17EPFGMydd2suYjbNShHrFYzj41JGUHTVa\",\n    \"kind\": \"p2pkh\",\n    \"hash160\": \"4458bb708fb5bbc23f799577d5d7c1c16398fd6f\"\n  },\n  \"status\": \"solved\",\n  \"pubkey\": {\n    \"value\": \"023b2309ea51d72b7147959bd21f5b90f185570e2dc4427420bd34f3e932f6cf5f\",\n    \"format\": \"compressed\"\n  },\n  \"key\": {\n    \"wif\": {\n      \"decrypted\": \"Kx5RaMi7KbKxouzMdEoszZDuGfLnn8aNEAx1xE8CJrsxBZGkStyY\"\n    },\n    \"seed\": {\n      \"entropy\": {\n        \"hash\": \"4c4cdbf69c62f3bf2dc68ab5400f8669\",\n        \"source\": {\n          \"url\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5xj38\u002F7_mbtc_quizchain2_block_51\u002F\",\n          \"description\": \"MD5 of the number and two words\"\n        }\n      }\n    },\n    \"derived\": true\n  },\n  \"prize\": 0.007,\n  \"start_date\": \"2019-06-26 23:04:41\",\n  \"solve_date\": \"2019-06-26 23:04:41\",\n  \"solve_time\": 0,\n  \"source_url\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5xj38\u002F7_mbtc_quizchain2_block_51\u002F\",\n  \"transactions\": [\n    {\n      \"tx_type\": \"funding\",\n      \"txid\": \"424a3f6ba6573baba805b363819975993adf6f6cb1c20949baf8efbe510d2eab\",\n      \"date\": \"2019-06-26 23:04:41\",\n      \"amount\": 0.007\n    },\n    {\n      \"tx_type\": \"claim\",\n      \"txid\": \"7eb91088189d1a511408f316bb6e3bf06e773b27dbcd6c152370c457b95f0f5c\",\n      \"date\": \"2019-06-26 23:04:41\",\n      \"amount\": 0.00664634\n    }\n  ],\n  \"hints\": [\n    {\n      \"kind\": \"official\",\n      \"text\": \"Format: [solution]\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5xj38\u002F7_mbtc_quizchain2_block_51\u002F\",\n      \"answer\": {\n        \"text\": \"Solution was simply \\\"51 percent attack\\\" and winner explained in comments that he already anticipated that, so the only time he needed was to run the Coleman tool.\",\n        \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5xj38\u002F7_mbtc_quizchain2_block_51\u002F\"\n      }\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"First three digits of MD5 hash are 4c4.\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5xj38\u002F7_mbtc_quizchain2_block_51\u002F\"\n    }\n  ],\n  \"techniques\": [\n    {\n      \"name\": \"md5-to-bip39-entropy\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5xj38\u002F7_mbtc_quizchain2_block_51\u002F\"\n    }\n  ]\n}",[546,553,560],{"kind":547,"label":547,"path":548,"url":549,"format":550,"screenshot":551,"origin":505,"date":552},"source","assets\u002Fsources\u002Fquizchain2\u002Faoinakamoto-2019-06-26-c5xj38.md","\u002Fassets\u002Fsources\u002Fquizchain2\u002Faoinakamoto-2019-06-26-c5xj38.md","markdown","\u002Fassets\u002Fsources\u002Fquizchain2\u002Faoinakamoto-2019-06-26-c5xj38.png","2019-06-26",{"kind":547,"label":554,"path":555,"url":556,"format":550,"screenshot":557,"origin":558,"date":559},"author's post","assets\u002Fsources\u002Fsatoshi-birthday-quiz\u002Faoinakamoto-2019-04-05-b9l37o.md","\u002Fassets\u002Fsources\u002Fsatoshi-birthday-quiz\u002Faoinakamoto-2019-04-05-b9l37o.md","\u002Fassets\u002Fsources\u002Fsatoshi-birthday-quiz\u002Faoinakamoto-2019-04-05-b9l37o.png","https:\u002F\u002Fwww.reddit.com\u002Fr\u002FBitcoin\u002Fcomments\u002Fb9l37o\u002F","2019-04-05",{"kind":547,"label":554,"path":561,"url":562,"format":550,"screenshot":563,"origin":564,"date":565},"assets\u002Fsources\u002Fsatoshi-birthday-quiz\u002Faoinakamoto-2019-04-10-ekjcc1k.md","\u002Fassets\u002Fsources\u002Fsatoshi-birthday-quiz\u002Faoinakamoto-2019-04-10-ekjcc1k.md","\u002Fassets\u002Fsources\u002Fsatoshi-birthday-quiz\u002Faoinakamoto-2019-04-10-ekjcc1k.png","https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbbij0e\u002Fmeidum_7_mbtc_quizchain_block_18\u002Fekjcc1k\u002F","2019-04-10","quizchain2\u002F50","quizchain2\u002F52",51,77,{"id":571,"title":508,"body":572,"description":623,"extension":627,"meta":628,"navigation":510,"path":629,"seo":630,"stem":488,"__hash__":631},"stories\u002Fquizchain2\u002F51.md",{"type":573,"value":574,"toc":622},"minimark",[575,580,593,596,600,607,619],[576,577,579],"h2",{"id":578},"no-question","No question",[581,582,583,584,588,589,592],"p",{},"June 26, 2019. Block 51 has a format, ",[585,586,587],"code",{},"[solution]",", and three digits, ",[585,590,591],{},"4c4",". No question. No TOMI field either.",[581,594,595],{},"The author funded it right before posting, with a high fee. The idea was to keep the window short, so nobody claims the prize before the post is even up. Smart. Did it help?",[576,597,599],{"id":598},"eight-seconds","Eight seconds",[581,601,602,603,606],{},"Not really. Block 51, so ",[585,604,605],{},"51 percent attack",". u\u002FDanTheDon83 saw it coming and had the answer written down in advance. u\u002FJDScreesh timed the claim at eight seconds after the post.",[581,608,609,610,614,615,618],{},"The funding and the claim confirmed in the same block, at ",[611,612,613],"strong",{},"23:04:41 UTC",". Solve time on the chain: zero. The claim paid ",[585,616,617],{},"16YUMnqAExU7yCCRaE1kfFrc4X9c4dMFjL",", the address from blocks 44 and 45. A script for the claim? No, Electrum, said the winner.",[581,620,621],{},"Not everyone cheered. \"Please go back to your puzzles\", wrote u\u002Fmapl3sn0w, and asked for real ciphers again. The author promised a harder one next.",{"title":623,"searchDepth":506,"depth":506,"links":624},"",[625,626],{"id":578,"depth":506,"text":579},{"id":598,"depth":506,"text":599},"md",{},"\u002Fquizchain2\u002F51",{"description":623},"m5vHnlpVTbh6ZV26h1MZZ0bVOQiQMo6gAd7cXXj11CI",1791479587727]