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BTC",0.007,"2019-06-25 23:44:43","2019-06-26 06:51:06","7h 6m","030ce01cec5d184e734c75768e3f25d6eb68f44ed09f567172047a9528445effc0","compressed","wif","wif(\"L56xZ3ZN8Js4i3rzpY2d5W6KtRBTcgesPPvhnkqrGLoCC95VBzUg\").entropy(\"c3260755c216f2e1b081b2fac119814b\", source(\"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\")).derived()","verified","https:\u002F\u002Fblockstream.info\u002Faddress\u002F1FGJhLU2gR2ucNbWsayA5pV15WbFJsvqGS","https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F",2,"quizchain2\u002F50\tsolved\t0.007 BTC\t1FGJhLU2gR2ucNbWsayA5pV15WbFJsvqGS\nchain: bitcoin  address kind: p2pkh\nhash160: 9c76c595614817a1fb37904cf4679a182894d0c7\npublic key: 030ce01cec5d184e734c75768e3f25d6eb68f44ed09f567172047a9528445effc0 (compressed)\nprivate key: L56xZ3ZN8Js4i3rzpY2d5W6KtRBTcgesPPvhnkqrGLoCC95VBzUg (wif, derived from the published recipe)\nentropy: c3260755c216f2e1b081b2fac119814b from https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F (MD5 of the checksum, TOMI and two words)\nstarted: 2019-06-25 23:44:43\nsolved: 2019-06-26 06:51:06 (7h 6m)\ntransactions: 2\n\tfunding\t2019-06-25 23:44:43\t0.007 BTC\t7c3aa2558e55003dc96dec0ffaea8d90dbc02e63acdec4c3665014471e3266f9\n\tclaim\t2019-06-26 06:51:06\t0.006736 BTC\t1f69eaad1365d96783f39e8d8024187a993c8c7710e32f9b2c2c28f71925be76\nclaim: https:\u002F\u002Fblockstream.info\u002Ftx\u002F1f69eaad1365d96783f39e8d8024187a993c8c7710e32f9b2c2c28f71925be76\ntechniques: 1\n\tmd5-to-bip39-entropy\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\nhints: 5\n\tofficial\t-\tQuestion: 111111111111111111111\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\tanswer: As explained by the winner in a comment below, solution was \"4oLvT2\" and TOMI field was \"address checksum\".\tanswer source: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\n\tofficial\t-\tFormat: [solution] TOMI [TOMI]\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\tanswer: 4oLvT2 TOMI address checksum\tanswer source: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002Fcomment\u002Fes2q2li\u002F\n\tofficial\t-\tFirst three digits of MD5 hash are c32.\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\n\tofficial\t-\tFirst digit of solution only Md5 hash is 8.\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\n\tofficial\t-\tFirst two digits of TOMI field only MD5 hash are 64.\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\nexplorer: https:\u002F\u002Fblockstream.info\u002Faddress\u002F1FGJhLU2gR2ucNbWsayA5pV15WbFJsvqGS\nsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\nfiles: 0 files, 3 archived sources; puzzles_assets lists them and reads one by its path","50",false,true,[513,516,519],{"label":514,"value":515,"mono":511},"WIF","L56xZ3ZN8Js4i3rzpY2d5W6KtRBTcgesPPvhnkqrGLoCC95VBzUg",{"label":517,"value":518,"mono":511},"entropy hash","c3260755c216f2e1b081b2fac119814b",{"label":520,"value":521,"mono":510,"href":506},"entropy source","MD5 of the checksum, TOMI and two words",[523,527],{"type":524,"txid":525,"date":497,"amount":495,"url":526},"funding","7c3aa2558e55003dc96dec0ffaea8d90dbc02e63acdec4c3665014471e3266f9","https:\u002F\u002Fblockstream.info\u002Ftx\u002F7c3aa2558e55003dc96dec0ffaea8d90dbc02e63acdec4c3665014471e3266f9",{"type":528,"txid":529,"date":498,"amount":530,"url":531},"claim","1f69eaad1365d96783f39e8d8024187a993c8c7710e32f9b2c2c28f71925be76","0.006736 BTC","https:\u002F\u002Fblockstream.info\u002Ftx\u002F1f69eaad1365d96783f39e8d8024187a993c8c7710e32f9b2c2c28f71925be76",[],[534,539,544,546,548],{"kind":535,"text":536,"source":506,"answer":537,"shared":510},"official","Question: 111111111111111111111",{"text":538,"source":506},"As explained by the winner in a comment below, solution was \"4oLvT2\" and TOMI field was \"address checksum\".",{"kind":535,"text":540,"source":506,"answer":541,"shared":510},"Format: [solution] TOMI [TOMI]",{"text":542,"source":543},"4oLvT2 TOMI address checksum","https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002Fcomment\u002Fes2q2li\u002F",{"kind":535,"text":545,"source":506,"shared":510},"First three digits of MD5 hash are c32.",{"kind":535,"text":547,"source":506,"shared":510},"First digit of solution only Md5 hash is 8.",{"kind":535,"text":549,"source":506,"shared":510},"First two digits of TOMI field only MD5 hash are 64.",[551],{"name":552,"source":506,"scope":553},"md5-to-bip39-entropy","puzzle","{\n  \"id\": \"quizchain2\u002F50\",\n  \"chain\": \"bitcoin\",\n  \"address\": {\n    \"value\": \"1FGJhLU2gR2ucNbWsayA5pV15WbFJsvqGS\",\n    \"kind\": \"p2pkh\",\n    \"hash160\": \"9c76c595614817a1fb37904cf4679a182894d0c7\"\n  },\n  \"status\": \"solved\",\n  \"pubkey\": {\n    \"value\": \"030ce01cec5d184e734c75768e3f25d6eb68f44ed09f567172047a9528445effc0\",\n    \"format\": \"compressed\"\n  },\n  \"key\": {\n    \"wif\": {\n      \"decrypted\": \"L56xZ3ZN8Js4i3rzpY2d5W6KtRBTcgesPPvhnkqrGLoCC95VBzUg\"\n    },\n    \"seed\": {\n      \"entropy\": {\n        \"hash\": \"c3260755c216f2e1b081b2fac119814b\",\n        \"source\": {\n          \"url\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\",\n          \"description\": \"MD5 of the checksum, TOMI and two words\"\n        }\n      }\n    },\n    \"derived\": true\n  },\n  \"prize\": 0.007,\n  \"start_date\": \"2019-06-25 23:44:43\",\n  \"solve_date\": \"2019-06-26 06:51:06\",\n  \"solve_time\": 25583,\n  \"source_url\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\",\n  \"transactions\": [\n    {\n      \"tx_type\": \"funding\",\n      \"txid\": \"7c3aa2558e55003dc96dec0ffaea8d90dbc02e63acdec4c3665014471e3266f9\",\n      \"date\": \"2019-06-25 23:44:43\",\n      \"amount\": 0.007\n    },\n    {\n      \"tx_type\": \"claim\",\n      \"txid\": \"1f69eaad1365d96783f39e8d8024187a993c8c7710e32f9b2c2c28f71925be76\",\n      \"date\": \"2019-06-26 06:51:06\",\n      \"amount\": 0.006736\n    }\n  ],\n  \"hints\": [\n    {\n      \"kind\": \"official\",\n      \"text\": \"Question: 111111111111111111111\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\",\n      \"answer\": {\n        \"text\": \"As explained by the winner in a comment below, solution was \\\"4oLvT2\\\" and TOMI field was \\\"address checksum\\\".\",\n        \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\"\n      }\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"Format: [solution] TOMI [TOMI]\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\",\n      \"answer\": {\n        \"text\": \"4oLvT2 TOMI address checksum\",\n        \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002Fcomment\u002Fes2q2li\u002F\"\n      }\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"First three digits of MD5 hash are c32.\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\"\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"First digit of solution only Md5 hash is 8.\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\"\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"First two digits of TOMI field only MD5 hash are 64.\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\"\n    }\n  ],\n  \"techniques\": [\n    {\n      \"name\": \"md5-to-bip39-entropy\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002FGrycoin\u002Fcomments\u002Fc5kst3\u002F7_mbtc_quizchain_2_block_50\u002F\"\n    }\n  ]\n}",[556,563,570],{"kind":557,"label":557,"path":558,"url":559,"format":560,"screenshot":561,"origin":506,"date":562},"source","assets\u002Fsources\u002Fquizchain2\u002Faoinakamoto-2019-06-26-c5kst3.md","\u002Fassets\u002Fsources\u002Fquizchain2\u002Faoinakamoto-2019-06-26-c5kst3.md","markdown","\u002Fassets\u002Fsources\u002Fquizchain2\u002Faoinakamoto-2019-06-26-c5kst3.png","2019-06-26",{"kind":557,"label":564,"path":565,"url":566,"format":560,"screenshot":567,"origin":568,"date":569},"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":557,"label":564,"path":571,"url":572,"format":560,"screenshot":573,"origin":574,"date":575},"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\u002F49","quizchain2\u002F51",50,77,{"id":581,"title":509,"body":582,"description":646,"extension":650,"meta":651,"navigation":511,"path":652,"seo":653,"stem":488,"__hash__":654},"stories\u002Fquizchain2\u002F50.md",{"type":583,"value":584,"toc":645},"minimark",[585,590,611,614,618,633],[586,587,589],"h2",{"id":588},"twenty-one-ones","Twenty-one ones",[591,592,593,594,598,599,602,603,606,607,610],"p",{},"June 26, 2019. The post starts with an apology for block 49 and its leaked TOMI field. No extra prize for that mistake, though. Then the question: ",[595,596,597],"code",{},"111111111111111111111",". Twenty-one ones. Digits ",[595,600,601],{},"c32",", ",[595,604,605],{},"8"," and ",[595,608,609],{},"64",".",[591,612,613],{},"Just a number? Not quite.",[586,615,617],{"id":616},"the-checksum","The checksum",[591,619,620,621,624,625,628,629,632],{},"Twenty-one ones are a valid Bitcoin address, almost. A block explorer completes it to ",[595,622,623],{},"1111111111111111111114oLvT2",". The missing part is the checksum. So the answer is ",[595,626,627],{},"4oLvT2",", and the TOMI field is ",[595,630,631],{},"address checksum",". The author found the trick in an old Bitcointalk post about address checksums.",[591,634,635,636,640,641,644],{},"u\u002FBrainForceOne explained the solve right after the claim confirmed, at ",[637,638,639],"strong",{},"06:51:06 UTC",", under three hours after the post. The claim paid their ",[595,642,643],{},"1Thanksg9t4MRoCH2CM3cArWq26JiNvMY"," again. \"This one was a good one\", wrote another player. Hard to argue.",{"title":646,"searchDepth":507,"depth":507,"links":647},"",[648,649],{"id":588,"depth":507,"text":589},{"id":616,"depth":507,"text":617},"md",{},"\u002Fquizchain2\u002F50",{"description":646},"T-B_YzYl7NXuYPSWGnsXO89y27lXSh46iu8xJSqvcWM",1791479587579]