quizchain/4

Solved on 2019-04-07 after 1h 29m, key published. 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.

Two words in one

The post asks "Do you know two words? They are in the word "know"." Write them together with no space, append the last three characters of the block 3 key, 83S, SHA-256 the string, entropy, m/44'/0'/0'/0/0. The author knew it was harder than the others and threw in one more hint: "Look at my handle name."

The words are arrow and mouth. The Kanji for "know", 知, is arrow on the left and mouth on the right, and the handle hint was there to say the name is Japanese. So the solution is arrowmouth83S. The next day a commenter asked how anyone was supposed to find that. The author answered with the etymology: an arrow is fast, and if you know something, you can speak fast.

An hour and a half

Funded at 09:15:55 UTC, posted at 09:17, swept at 10:45:28 for 699,322 satoshis. The post promised the solution "in about an hour", and the edit can't say who won: "not sure if that is because I posted the solution on my Twitter feed or if the puzzle was solved." The author also says they "did NOT take back the prize". The same edit carries the solution and the WIF.

IDquizchain/404 / 772019-04-07

Puzzle / quizchain

4

bitcoinp2pkh solved

Record

puzzle({
  chain: "bitcoin",
  address: "1JUZ8dxsH67y…ENtzM3NU",
  status: Status.Solved,
  key: wif("KwZXovJ7Fxu3…5GXd86TX").entropy("0574a857c65a…995ea4fa", source("https://www.…block_4/")),
})

Prize: 0.007 BTC
Key material: wif
Verification: verified
Solved: 2019-04-07 · 1h 29m

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/bitcoinpuzzles/comments/baejeg/medium_7_mbtc_quizchain_block_4; Tryquizchain/4 in the playground

Address: 1JUZ8dxsH67yZd9KcuqpsSPA6fENtzM3NU

hash160 bfb03103ed7259e878deb4a72fc987f42fdce21e

Balance

asking the explorer

Key

public key · compressed: 034c27064d1789e275d76e898f5d5525bf6a5833ca959e02269db025b196cecdec
WIF: KwZXovJ7Fxu39q7TYmnwrjmBoYCcS86nga8snnsB6RDD5GXd86TX
entropy hash: 0574a857c65a79835fa888c5321facc875073f553b94d1985041fd8f995ea4fa
entropy source: SHA-256 of the two words with the last three characters of the block 3 key appended

Transactions

funding2019-04-070.007 BTC29eb1d7fda…8e01b5
claim2019-04-070.00699322 BTC4a571d0602…a95f14

Files

Techniques

sha256-to-bip39-entropypuzzlereddit.com/r/bitcoinpuzzles/comments/baejeg/medium_7_mbtc_quizchain_block_4

Hints

undated
officialDo you know two words? They are in the word "know".
Sourcereddit.com/r/bitcoinpuzzles/comments/baejeg/medium_7_mbtc_quizchain_block_4Confirmweb.archive.org
Published answer
The Chinese symbol (Kanji) for "know" is composed of the two elements "arrow" (to the left) and "mouth" (to the right).
Sourcereddit.com/r/bitcoinpuzzles/comments/baejeg/medium_7_mbtc_quizchain_block_4
undated
officialAs always, take the solution string (no space between the two words), append the last three digits from the private key of the third block, run a SHA 256 hash on that and then use as entropy for brain wallet.
Sourcereddit.com/r/bitcoinpuzzles/comments/baejeg/medium_7_mbtc_quizchain_block_4
Published answer
arrowmouth83S
Sourcereddit.com/r/bitcoinpuzzles/comments/baejeg/medium_7_mbtc_quizchain_block_4
undated
officialThis one is difficult, so here is one extra hint. Look at my handle name.
Sourcereddit.com/r/bitcoinpuzzles/comments/baejeg/medium_7_mbtc_quizchain_block_4
Published answer
The hint about my handlename was to point to the fact that it is a Japanese name.
Sourcereddit.com/r/bitcoinpuzzles/comments/baejeg/medium_7_mbtc_quizchain_block_4