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25, 2018, 06:43 UTC. A YouTube channel called Crypto Puzzles uploads its first video. Twenty seconds long. The description says \"Part 1 of the crypto puzzle. Good luck.\" and promises the rest in part 2.",[535,539,540],{},"Part 2 lands the next morning. \"2 parts, 1 answer.\" Whoever's first wins 0.05 ETH. Less than seven hours later the Ether is gone.",[535,542,543],{},"So the channel made a second one, \"decidely trickier\". That one's still waiting.",[535,545,546,547,550],{},"One letter matters here. ",[548,549,310],"a",{"href":181},", with an r, is the Doge's Gambit channel. Different channel, different keys, and no source here ties the two together.",[552,553],"collection-facts",{"collection":554},"crypto-puzzles",[556,557,559],"h2",{"id":558},"crypto-puzzle-1-solved-in-hours","Crypto Puzzle 1, solved in hours",[535,561,562],{},"Two clips, twenty seconds each, and one answer: 64 hex characters. No seed, no passphrase, no derivation path. The answer is the private key itself. Read it right and the address follows.",[535,564,565,566,570,571,574],{},"Which address? The videos never say. The chain does. On July 19, six days before part 1, ",[567,568,569],"code",{},"0x0a937e…2e15"," sent exactly 0.05 ETH to ",[567,572,573],{},"0xc99A54…7a8f",". That's the prize, and the key on the solution screen opens it.",[576,577,579],"h3",{"id":578},"how-fast-did-it-go","How fast did it go?",[535,581,582,583,585],{},"Part 2 went up at 07:09 UTC on July 26. At 14:03 UTC 0.049682 ETH left ",[567,584,573],{},". Under seven hours from the final clip, about 31 from the first. \"The first puzzle was solved in hours\", the author wrote later. Fair.",[576,587,589],{"id":588},"the-generous-solver-who-wasnt-two-people","The generous solver who wasn't two people",[535,591,592,593,599],{},"The ",[548,594,598],{"href":595,"rel":596},"https:\u002F\u002Fwww.youtube.com\u002Fwatch?v=0jJ6XadOAWk",[597],"nofollow","solution video"," from August 1 congratulates \"at least 2 solvers\". One took the 0.05 ETH and \"kindly left 0.0001ETH so someone else could see they have solved it too\". Then somebody else \"quickly took that too\".",[535,601,602,603,606],{},"Nice story. The chain tells it a bit differently. The leftover went at 20:03 UTC, six hours after the prize, to ",[567,604,605],{},"0xc9089c…8171",". The same address that got the 0.049682 ETH. One wallet, twice. One solver being polite to themselves? Two friends sharing a wallet? The chain can't say. The record keeps that address as the solver and doesn't count heads.",[576,608,610],{"id":609},"is-the-key-on-screen-right","Is the key on screen right?",[535,612,613],{},"The solution video ends on \"THE SOLUTION\" and three lines of hex, 23, 23 and 18 characters. Glue them together:",[615,616,622],"pre",{"className":617,"code":619,"language":620,"meta":621},[618],"language-text","4487FC620AD0C4C67E80BE342B2EA1F5A3DC482BE6FB9C2451007322EA8BE35F\n","text","",[567,623,619],{"__ignoreMap":621},[535,625,626,629],{},[567,627,628],{},"puzzles verify crypto-puzzles\u002F1"," derives this from it:",[615,631,634],{"className":632,"code":633,"language":620,"meta":621},[618],"0xc99A54EEA6036115f913A13D6606e935bcA47a8f\n",[567,635,633],{"__ignoreMap":621},[535,637,638],{},"Same address the funder paid and the solver emptied. That frame ships in the repo too, so the key doesn't depend on YouTube staying up.",[556,640,642],{"id":641},"crypto-puzzle-2-still-unsolved","Crypto Puzzle 2, still unsolved",[535,644,645,646,648,649,652],{},"August 1, 2018, 04:14 UTC. The same ",[567,647,569],{}," sends another 0.05 ETH, this time to ",[567,650,651],{},"0x1fa8Be…61ad",". Twenty four minutes later the solution video for puzzle 1 goes up. The author was loading the next round before announcing the last one.",[535,654,655],{},"Part 1 of the second puzzle came on August 6. Part 2 took three weeks, August 27, with a warning: \"The first puzzle was solved in hours, so our second is decidely trickier. Are you smart enough?\"",[535,657,658],{},"Eight years later? Apparently not yet.",[576,660,662],{"id":661},"where-does-the-prize-address-come-from","Where does the prize address come from?",[535,664,665,666,671],{},"Not from the author. Neither video names it, in the footage or the description. The address comes from the chain: same funder, same amount, five days before part 1. A commenter posted it under part 2 when somebody asked, and ",[548,667,670],{"href":668,"rel":669},"https:\u002F\u002Fgithub.com\u002Ffloflo777\u002Fopen-crypto-puzzles\u002Ftree\u002Fmain\u002F3-small-prizes\u002Fcrypto-puzzles-2018-puzzle-2-0-05eth",[597],"floflo777's open-crypto-puzzles catalog"," reads it the same way.",[535,673,674,675,678],{},"It's an inference. A strong one, though. If the key ever turns up, ",[567,676,677],{},"puzzles verify crypto-puzzles\u002F2"," settles it in a second.",[576,680,682],{"id":681},"is-crypto-puzzle-2-solved","Is Crypto Puzzle 2 solved?",[535,684,685,686,688],{},"No. On October 18, 2026 ",[567,687,651],{}," still holds 0.05 ETH from that one funding transaction. Nothing has ever left it. Under part 2 a viewer sums up the mood: \"Video 1 was easy enough to solve in Puzzle 2, but part 2 has baffled me for years.\"",[535,690,691],{},"The hints are just the two video descriptions. That's all the author ever gave.",[576,693,695],{"id":694},"check-it-yourself","Check it yourself",[615,697,701],{"className":698,"code":699,"language":700,"meta":621,"style":621},"language-bash shiki shiki-themes puzzles puzzles puzzles","npx @agntn\u002Fpuzzles verify crypto-puzzles\u002F1\nnpx @agntn\u002Fpuzzles balance crypto-puzzles\u002F2\nnpx @agntn\u002Fpuzzles hints crypto-puzzles\u002F2\n","bash",[567,702,703,722,735],{"__ignoreMap":621},[704,705,708,712,716,719],"span",{"class":706,"line":707},"line",1,[704,709,711],{"class":710},"sK71F","npx",[704,713,715],{"class":714},"shU9J"," @agntn\u002Fpuzzles",[704,717,718],{"class":714}," verify",[704,720,721],{"class":714}," crypto-puzzles\u002F1\n",[704,723,725,727,729,732],{"class":706,"line":724},2,[704,726,711],{"class":710},[704,728,715],{"class":714},[704,730,731],{"class":714}," balance",[704,733,734],{"class":714}," crypto-puzzles\u002F2\n",[704,736,738,740,742,745],{"class":706,"line":737},3,[704,739,711],{"class":710},[704,741,715],{"class":714},[704,743,744],{"class":714}," hints",[704,746,734],{"class":714},[535,748,749,750,755],{},"The solution frame lives at ",[548,751,754],{"href":752,"rel":753},"https:\u002F\u002Fgithub.com\u002Fagntn\u002Fpuzzles\u002Ftree\u002Fmain\u002Fassets\u002Fcrypto-puzzles\u002F1",[597],"assets\u002Fcrypto-puzzles\u002F1",", its SHA-256 pinned in the record.",[556,757,759],{"id":758},"browse-the-crypto-puzzles-records","Browse the Crypto Puzzles records",[761,762],"collection-puzzles",{"collection":554},[764,765,766],"style",{},"html pre.shiki code .sK71F, html code.shiki .sK71F{--shiki-light:var(--shiki-token-function);--shiki-default:var(--shiki-token-function);--shiki-dark:var(--shiki-token-function)}html pre.shiki code .shU9J, html code.shiki .shU9J{--shiki-light:var(--shiki-token-string);--shiki-default:var(--shiki-token-string);--shiki-dark:var(--shiki-token-string)}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"title":621,"searchDepth":724,"depth":724,"links":768},[769,774,779],{"id":558,"depth":724,"text":559,"children":770},[771,772,773],{"id":578,"depth":737,"text":579},{"id":588,"depth":737,"text":589},{"id":609,"depth":737,"text":610},{"id":641,"depth":724,"text":642,"children":775},[776,777,778],{"id":661,"depth":737,"text":662},{"id":681,"depth":737,"text":682},{"id":694,"depth":737,"text":695},{"id":758,"depth":724,"text":759},"Crypto Puzzles hid a raw Ethereum private key in two pairs of short YouTube videos in 2018. The first went in hours and the second still holds 0.05 ETH","md",null,{"icon":784},"i-lucide-square-play",{"title":256},{"title":787,"description":780},"Crypto Puzzles: two 2018 YouTube Ether puzzles, one unsolved","yN9HkKot80rMCUTNJYwV8AOvB2_OAw4-vxIhGgHMjac",[790,792],{"title":252,"path":253,"stem":254,"description":791,"children":-1},"Gem Finder's Bitcoin puzzle pairs 9vw04 with a coloured character grid. The author says the post holds everything needed for a WIF",{"title":54,"path":262,"stem":263,"description":793,"children":-1},"The people and companies behind the collections. Each page keeps what public sources say about the author and where they said it.",{"numeric":795,"rows":796},true,[797,804],{"id":798,"name":799,"status":800,"prize":801,"address":802,"pubkey":795,"key":795,"derived":803,"bits":-1},"crypto-puzzles\u002F1","1","solved","0.05 ETH","0xc99A54EEA6036115f913A13D6606e935bcA47a8f",false,{"id":805,"name":806,"status":807,"prize":801,"address":808,"pubkey":803,"key":803,"derived":803,"bits":-1},"crypto-puzzles\u002F2","2","unsolved","0x1fa8Be9De5bBFE047C72dB8E8E3257128F7661ad",{"key":554,"author":256,"authorKey":554,"authorUrl":810,"total":724,"statuses":811,"chains":812,"prize":814,"unsolvedPrize":816,"withPubkey":707,"withKey":707,"firstStarted":818,"lastStarted":819,"hints":820,"ticks":821,"position":822,"registered":823,"dataVersion":824},"https:\u002F\u002Fwww.youtube.com\u002Fchannel\u002FUCR8-P07nNhxyEr6fwJXvjQQ",{"solved":707,"unsolved":707},[813],"ethereum",{"ETH":815},0.1,{"ETH":817},0.05,"2018-07-25 06:43:23","2018-08-06 06:08:41",[],[800,807],12,51,"36065119561b",1792541047168]