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recipe)\nentropy: 9acb509e171c3baaf8ad1fa982648bdc from https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbo356q\u002F7_mbtc_quizchain2_block_4\u002F (MD5 of the word, TOMI and four words)\nstarted: 2019-05-13 12:33:25\nsolved: 2019-05-13 13:57:44 (1h 24m)\ntransactions: 2\n\tfunding\t2019-05-13 12:33:25\t0.007 BTC\t7446567ec9b8247cc77a34441c24c0eec15922b2b5e524725ec0977f63bb82b9\n\tclaim\t2019-05-13 13:57:44\t0.00679648 BTC\t12f20e5e032070cb3a6b9ad105cb4caca0c5123234cf328e0ec83fba6096a25e\nclaim: https:\u002F\u002Fblockstream.info\u002Ftx\u002F12f20e5e032070cb3a6b9ad105cb4caca0c5123234cf328e0ec83fba6096a25e\nhints: 5\n\tofficial\t-\tQuestion: Looking for a four letter word. 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Yes, quite safe for work.",{"text":445,"source":412},"Once you see the word in the previous block private key, it becomes easy. That is the reason I did not include a link, since it would become too obvious.",{"kind":442,"text":447,"source":412,"answer":448,"shared":416},"Format: [solution] TOMI [TOMI]",{"text":449,"source":450},"MasK TOMI previous block private key","https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbo356q\u002Fcomment\u002Fenbxj6y\u002F",{"kind":442,"text":452,"source":412,"shared":416},"First three digits of MD5 hash: 9ac",{"kind":442,"text":454,"source":412,"shared":416},"First digit of solution only MD5 hash: 2",{"kind":442,"text":456,"source":412,"shared":416},"First digit of TOMI field only MD5 hash: 9","{\n  \"id\": \"quizchain2\u002F4\",\n  \"chain\": \"bitcoin\",\n  \"address\": {\n    \"value\": \"1C1e2wvP5p6JRyV4BtRHjprCuBcUXLudNQ\",\n    \"kind\": \"p2pkh\",\n    \"hash160\": \"78c84c353224ce0bfcbc9eab8f64201ab14935fd\"\n  },\n  \"status\": \"solved\",\n  \"pubkey\": {\n    \"value\": \"0385f0b820b4a7de14503b97a86b61904f1ffde8beae67a7b131f8265dd37a0828\",\n    \"format\": \"compressed\"\n  },\n  \"key\": {\n    \"wif\": {\n      \"decrypted\": \"L3PyFkCsVdej9qktSKZvfYqzmxes6SWRvGeAqoS4jxirrSi69hfz\"\n    },\n    \"seed\": {\n      \"entropy\": {\n        \"hash\": \"9acb509e171c3baaf8ad1fa982648bdc\",\n        \"source\": {\n          \"url\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbo356q\u002F7_mbtc_quizchain2_block_4\u002F\",\n          \"description\": \"MD5 of the word, TOMI and four words\"\n        }\n      }\n    },\n    \"derived\": true\n  },\n  \"prize\": 0.007,\n  \"start_date\": \"2019-05-13 12:33:25\",\n  \"solve_date\": \"2019-05-13 13:57:44\",\n  \"solve_time\": 5059,\n  \"source_url\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbo356q\u002F7_mbtc_quizchain2_block_4\u002F\",\n  \"transactions\": [\n    {\n      \"tx_type\": \"funding\",\n      \"txid\": \"7446567ec9b8247cc77a34441c24c0eec15922b2b5e524725ec0977f63bb82b9\",\n      \"date\": \"2019-05-13 12:33:25\",\n      \"amount\": 0.007\n    },\n    {\n      \"tx_type\": \"claim\",\n      \"txid\": \"12f20e5e032070cb3a6b9ad105cb4caca0c5123234cf328e0ec83fba6096a25e\",\n      \"date\": \"2019-05-13 13:57:44\",\n      \"amount\": 0.00679648\n    }\n  ],\n  \"hints\": [\n    {\n      \"kind\": \"official\",\n      \"text\": \"Question: Looking for a four letter word. Yes, quite safe for work.\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbo356q\u002F7_mbtc_quizchain2_block_4\u002F\",\n      \"answer\": {\n        \"text\": \"Once you see the word in the previous block private key, it becomes easy. That is the reason I did not include a link, since it would become too obvious.\",\n        \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbo356q\u002F7_mbtc_quizchain2_block_4\u002F\"\n      }\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"Format: [solution] TOMI [TOMI]\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbo356q\u002F7_mbtc_quizchain2_block_4\u002F\",\n      \"answer\": {\n        \"text\": \"MasK TOMI previous block private key\",\n        \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbo356q\u002Fcomment\u002Fenbxj6y\u002F\"\n      }\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"First three digits of MD5 hash: 9ac\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbo356q\u002F7_mbtc_quizchain2_block_4\u002F\"\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"First digit of solution only MD5 hash: 2\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbo356q\u002F7_mbtc_quizchain2_block_4\u002F\"\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"First digit of TOMI field only MD5 hash: 9\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbo356q\u002F7_mbtc_quizchain2_block_4\u002F\"\n    }\n  ]\n}","quizchain2\u002F3","quizchain2\u002F5",4,10,{"id":463,"title":415,"body":464,"description":536,"extension":540,"meta":541,"navigation":417,"path":542,"seo":543,"stem":394,"__hash__":544},"stories\u002Fquizchain2\u002F4.md",{"type":465,"value":466,"toc":535},"minimark",[467,472,481,496,500,510,521,532],[468,469,471],"h2",{"id":470},"a-four-letter-word","A four letter word",[473,474,475,476,480],"p",{},"May 13. \"Looking for a four letter word. Yes, quite safe for work.\" Format ",[477,478,479],"code",{},"[solution] TOMI [TOMI]",", no link. The post says why: the solution and TOMI field have enough entropy on their own. The real reason comes later.",[473,482,483,484,487,488,491,492,495],{},"The prefixes: ",[477,485,486],{},"9ac"," for the whole string, ",[477,489,490],{},"2"," for the answer, ",[477,493,494],{},"9"," for the TOMI field. And a warning: \"either very easy if you get the method or impossible if not.\"",[468,497,499],{"id":498},"mask","MasK",[473,501,502,503,506,507,509],{},"Look at the block 3 key. ",[477,504,505],{},"L488KiS3jUut79rDM6gwxUdg7Qm1SXwQnMasKLpzFzb6KrNLsFpT",". See it? Right there, ",[477,508,499],{},". Once you see it, you can't unsee it.",[473,511,512,513,516,517,520],{},"That's why there's no link. With the block 3 key in the format, the word would jump out at you. The author had done this before, with ",[477,514,515],{},"Hoax"," and ",[477,518,519],{},"hit"," in first run keys. And this one fits the theme. Privacy was Bitcoin's original purpose, so a mask is a pretty good word to find.",[473,522,523,524,528,529,531],{},"u\u002Fpuzzleponky had it in an hour. The claim confirmed at ",[525,526,527],"strong",{},"13:57:44 UTC",". The full string is ",[477,530,449],{},". They tried the whole key as the TOMI field first, expecting a twist. No luck, so a few more tries.",[473,533,534],{},"Nobody printed this key. The record derives it.",{"title":536,"searchDepth":413,"depth":413,"links":537},"",[538,539],{"id":470,"depth":413,"text":471},{"id":498,"depth":413,"text":499},"md",{},"\u002Fquizchain2\u002F4",{"description":536},"Tj4zp50BIiUvJvPL6A3JxbLv3bREeo1rzwf4WNUJ7dw",1790876849670]