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published recipe)\nentropy: 3b28447d7c7713c4f1477bca49a75c13 from https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbbeuye\u002Fmedium_7_mbtc_quizchain_block_16\u002F (MD5 of the fixed handle, a space and the last three characters of the block 15 key)\nstarted: 2019-04-09 23:30:50\nsolved: 2019-04-10 05:27:17 (5h 56m)\ntransactions: 2\n\tfunding\t2019-04-09 23:30:50\t0.007 BTC\t602f53a24fecdb5face4b1ed7eecfa9e7ab78f995eb015f074aac89c7332968c\n\tclaim\t2019-04-10 05:27:17\t0.00679629 BTC\tb909c46f87694505ca4531d34ef18cd017ae82c08d69b1e9e704f7fdd387825c\nclaim: https:\u002F\u002Fblockstream.info\u002Ftx\u002Fb909c46f87694505ca4531d34ef18cd017ae82c08d69b1e9e704f7fdd387825c\nhints: 2\n\tofficial\t-\tThe question for block 16: 40 is an illegal number. Fix it. Format for the answer: [solution] [linking three digits from block 15]. Exactly one space between solution and chain link.\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbbeuye\u002Fmedium_7_mbtc_quizchain_block_16\u002F\tanswer: Solution was derived from the handle name of my 16th follower at the Twitter feed, which is HE4OBEK. The \"4O\" in the middle is illegal in the Bitcoin address space, since people may be unable to distinguish \"0\" from \"O\". To fix it, replace it with lowercase o, for a solution string \"HE4oBEK\".\tanswer source: https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbbeuye\u002Fmedium_7_mbtc_quizchain_block_16\u002F\n\tofficial\t-\tUpdate: Double-checking revealed that this block also was hashed with MD5.\tsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbbeuye\u002Fmedium_7_mbtc_quizchain_block_16\u002F\nexplorer: https:\u002F\u002Fblockstream.info\u002Faddress\u002F12jpR4kuvZwYqyEFAwEVPq3KKgekFYtent\nsource: https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbbeuye\u002Fmedium_7_mbtc_quizchain_block_16\u002F","16",false,true,[359,362,365],{"label":360,"value":361,"mono":357},"WIF","KzuMwz6AriziBq1R5HiYxPzk9f3WzEQ7QyWVhAr8pn8Dwu91FdfP",{"label":363,"value":364,"mono":357},"entropy hash","3b28447d7c7713c4f1477bca49a75c13",{"label":366,"value":367,"mono":356,"href":352},"entropy source","MD5 of the fixed handle, a space and the last three characters of the block 15 key",[369,373],{"type":370,"txid":371,"date":343,"amount":341,"url":372},"funding","602f53a24fecdb5face4b1ed7eecfa9e7ab78f995eb015f074aac89c7332968c","https:\u002F\u002Fblockstream.info\u002Ftx\u002F602f53a24fecdb5face4b1ed7eecfa9e7ab78f995eb015f074aac89c7332968c",{"type":374,"txid":375,"date":344,"amount":376,"url":377},"claim","b909c46f87694505ca4531d34ef18cd017ae82c08d69b1e9e704f7fdd387825c","0.00679629 BTC","https:\u002F\u002Fblockstream.info\u002Ftx\u002Fb909c46f87694505ca4531d34ef18cd017ae82c08d69b1e9e704f7fdd387825c",[],[],[381,386],{"kind":382,"text":383,"source":352,"answer":384,"shared":356},"official","The question for block 16: 40 is an illegal number. Fix it. Format for the answer: [solution] [linking three digits from block 15]. Exactly one space between solution and chain link.",{"text":385,"source":352},"Solution was derived from the handle name of my 16th follower at the Twitter feed, which is HE4OBEK. The \"4O\" in the middle is illegal in the Bitcoin address space, since people may be unable to distinguish \"0\" from \"O\". To fix it, replace it with lowercase o, for a solution string \"HE4oBEK\".",{"kind":382,"text":387,"source":352,"shared":356},"Update: Double-checking revealed that this block also was hashed with MD5.","{\n  \"id\": \"quizchain\u002F16\",\n  \"chain\": \"bitcoin\",\n  \"address\": {\n    \"value\": \"12jpR4kuvZwYqyEFAwEVPq3KKgekFYtent\",\n    \"kind\": \"p2pkh\",\n    \"hash160\": \"13112d185509b2f3e7bee0a6768edd92e8cd8a6e\"\n  },\n  \"status\": \"solved\",\n  \"pubkey\": {\n    \"value\": \"03b5242f46392c5161149181ff153be661d559487ce77422f9c5d89dccdd65a0a6\",\n    \"format\": \"compressed\"\n  },\n  \"key\": {\n    \"wif\": {\n      \"decrypted\": \"KzuMwz6AriziBq1R5HiYxPzk9f3WzEQ7QyWVhAr8pn8Dwu91FdfP\"\n    },\n    \"seed\": {\n      \"entropy\": {\n        \"hash\": \"3b28447d7c7713c4f1477bca49a75c13\",\n        \"source\": {\n          \"url\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbbeuye\u002Fmedium_7_mbtc_quizchain_block_16\u002F\",\n          \"description\": \"MD5 of the fixed handle, a space and the last three characters of the block 15 key\"\n        }\n      }\n    },\n    \"derived\": true\n  },\n  \"prize\": 0.007,\n  \"start_date\": \"2019-04-09 23:30:50\",\n  \"solve_date\": \"2019-04-10 05:27:17\",\n  \"solve_time\": 21387,\n  \"source_url\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbbeuye\u002Fmedium_7_mbtc_quizchain_block_16\u002F\",\n  \"transactions\": [\n    {\n      \"tx_type\": \"funding\",\n      \"txid\": \"602f53a24fecdb5face4b1ed7eecfa9e7ab78f995eb015f074aac89c7332968c\",\n      \"date\": \"2019-04-09 23:30:50\",\n      \"amount\": 0.007\n    },\n    {\n      \"tx_type\": \"claim\",\n      \"txid\": \"b909c46f87694505ca4531d34ef18cd017ae82c08d69b1e9e704f7fdd387825c\",\n      \"date\": \"2019-04-10 05:27:17\",\n      \"amount\": 0.00679629\n    }\n  ],\n  \"hints\": [\n    {\n      \"kind\": \"official\",\n      \"text\": \"The question for block 16: 40 is an illegal number. Fix it. Format for the answer: [solution] [linking three digits from block 15]. Exactly one space between solution and chain link.\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbbeuye\u002Fmedium_7_mbtc_quizchain_block_16\u002F\",\n      \"answer\": {\n        \"text\": \"Solution was derived from the handle name of my 16th follower at the Twitter feed, which is HE4OBEK. The \\\"4O\\\" in the middle is illegal in the Bitcoin address space, since people may be unable to distinguish \\\"0\\\" from \\\"O\\\". To fix it, replace it with lowercase o, for a solution string \\\"HE4oBEK\\\".\",\n        \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbbeuye\u002Fmedium_7_mbtc_quizchain_block_16\u002F\"\n      }\n    },\n    {\n      \"kind\": \"official\",\n      \"text\": \"Update: Double-checking revealed that this block also was hashed with MD5.\",\n      \"source\": \"https:\u002F\u002Fwww.reddit.com\u002Fr\u002Fbitcoinpuzzles\u002Fcomments\u002Fbbeuye\u002Fmedium_7_mbtc_quizchain_block_16\u002F\"\n    }\n  ]\n}","quizchain\u002F15","quizchain\u002F17",16,77,{"id":394,"title":355,"body":395,"description":427,"extension":430,"meta":431,"navigation":357,"path":432,"seo":433,"stem":334,"__hash__":434},"stories\u002Fquizchain\u002F16.md",{"type":396,"value":397,"toc":426},"minimark",[398,403,407,423],[399,400,402],"h2",{"id":401},"an-illegal-number","An illegal number",[404,405,406],"p",{},"\"40 is an illegal number. Fix it.\" Impossible without the Twitter feed, the post says, and it's right.",[404,408,409,410,414,415,418,419,422],{},"The author's 16th Twitter follower is ",[411,412,413],"code",{},"HE4OBEK",". That ",[411,416,417],{},"O"," is illegal in a Bitcoin address, because it looks like a zero. Make it lowercase and the string is ",[411,420,421],{},"HE4oBEK zF3",".",[404,424,425],{},"This one got hashed with MD5 too, also by accident. After that the author gave up and made MD5 the rule.",{"title":427,"searchDepth":353,"depth":353,"links":428},"",[429],{"id":401,"depth":353,"text":402},"md",{},"\u002Fquizchain\u002F16",{"description":427},"j2XJ0p6TK1JoJOShJsdBf6fbEMS9r9WgTrHpSl08kDI",1790513961599]