quizchain2/8

Solved on 2019-05-17 after 13h 50m, key derived from the published recipe. 0.007 BTC on Bitcoin.

Story

What the post asked, what the answer turned out to be, and what the chain says happened. The record below holds the data.

Eight words and a link

May 16, 7 mBTC. "Eight words." All lowercase, one space, no period, MD5 prefix b32. This one has a link again, the block 6 key L2gi9LjJwv6oRBdBAJMo3QTNmfdqLRYxbW7o1MhC5K7NNh2JqPSZ.

Why the link? To keep out "outside brute forcing", bots that try cracking lists without knowing the quizchain exists. u/silver_anth didn't buy it. "I don't think these exist." The author had an answer. Brainwallets on famous phrases get emptied fast. And then: "I know that. Which is in turn a hint for the solution..."

Correct horse battery staple

It's xkcd 936. The most famous password in the world. The twist is that it appears twice: correct horse battery staple correct horse battery staple plus the link.

u/mooncritic got it. The claim confirmed at 01:47:58 UTC on May 17, with a fat fee. The author asked: without a script? "Yes, that's right." "Glad to hear that humans beat the bots this time."

That was the whole test. The author wanted to see if the script players would catch a classic password right away. They didn't. Humans 1, bots 0. Nobody printed the key, so the record derives it.

IDquizchain2/808 / 102019-05-16 → 2019-05-17

Puzzle / quizchain2

8

bitcoinp2pkh solved

Record

bitcoinPuzzle({
  address: p2pkh("18AoFSmoTH34…dS1iwswD", "4ea33b1c1738…7ae5531e"),
  status: Status.Solved,
  key: wif("L45dLEP5xr2a…ZSgAyXUh").entropy("b322677e2c01…b824174d", source("https://www.…block_8/")).derived(),
})

Prize: 0.007 BTC
Key material: wif, derived from the recipe
Verification: verified
Solved: 2019-05-17 · 13h 50m

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/bitcoinpuzzles/comments/bpjipk/7_mbtc_quizchain2_block_8; Tryquizchain2/8 in the playground

Address: 18AoFSmoTH34cbRy9QW4X4ZxCTdS1iwswD

hash160 4ea33b1c17388c6769b9c3e958dab37a7ae5531e

Balance

asking the explorer

Key

public key · compressed: 02b302546efc47a42ccfe849e7797dfefb6639755424e74db4328cce95fc717906
WIF: L45dLEP5xr2aZLaGuMagF8bcr9PNurGgigqAQa2vFkLSZSgAyXUh
entropy hash: b322677e2c01cc97c918f241b824174d
entropy source: MD5 of the eight words and the whole block 6 key

Transactions

funding2019-05-160.007 BTC3a9f2bd0ff…19ea50
claim2019-05-170.00648415 BTC5d20412ed6…94c37e

Hints

undated
officialQuestion: Eight words.
Sourcereddit.com/r/bitcoinpuzzles/comments/bpjipk/7_mbtc_quizchain2_block_8
Published answer
I used the famous passphrase "correct horse battery staple" for this one as a challenge to the players that rely on scripts to get their solution.
Sourcereddit.com/r/bitcoinpuzzles/comments/bpjipk/7_mbtc_quizchain2_block_8
undated
officialFormat: [word1 word2 word3 word4 word5 word6 word7 word8] [link]
Sourcereddit.com/r/bitcoinpuzzles/comments/bpjipk/7_mbtc_quizchain2_block_8
Published answer
correct horse battery staple correct horse battery staple
Sourcereddit.com/r/bitcoinpuzzles/comments/bpjipk/comment/enuhtjg
undated
officialAll words in all letters lower case and one space between words, no period at the end.
Sourcereddit.com/r/bitcoinpuzzles/comments/bpjipk/7_mbtc_quizchain2_block_8
undated
officialUse L2gi9LjJwv6oRBdBAJMo3QTNmfdqLRYxbW7o1MhC5K7NNh2JqPSZ as a link.
Sourcereddit.com/r/bitcoinpuzzles/comments/bpjipk/7_mbtc_quizchain2_block_8
undated
officialFirst three digits of MD5 hash are b32.
Sourcereddit.com/r/bitcoinpuzzles/comments/bpjipk/7_mbtc_quizchain2_block_8
undated
officialI know that. Which is in turn a hint for the solution...
Sourcereddit.com/r/bitcoinpuzzles/comments/bpjipk/comment/enugazk