quizchain/51

Solved on 2019-04-19 after 1h 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.

The favorite block

"What is my favorite block?" The answer is that block's answer, and the field stops people from just trying all fifty.

It's Second, with the field title on cover. The update says block 21, but block 21's answer is the Satoshi sentence. Second belongs to block 19. Two hours.

IDquizchain/5151 / 772019-04-19

Puzzle / quizchain

51

bitcoinp2pkh solved

Record

bitcoinPuzzle({
  address: p2pkh("17mRF1q6ws8t…L5uSczbB", "4a374afc40d6…e9173c23"),
  status: Status.Solved,
  key: wif("L1ozkMNDweE1…DHLKwhQ1").entropy("a5138d23c4ac…6f2c775e", source("https://www.…lock_51/")).derived(),
})

Prize: 0.007 BTC
Key material: wif, derived from the recipe
Verification: verified
Solved: 2019-04-19 · 1h 50m

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/bitcoinpuzzles/comments/bexc8c/7_mbtc_quizchain_block_51; Tryquizchain/51 in the playground

Address: 17mRF1q6ws8tZQj93KiKHjWRiXL5uSczbB

hash160 4a374afc40d660131edb2b6749e99092e9173c23

Balance

asking the explorer

Key

public key · compressed: 02b0e6451e82fe2452929b574af6a5f3e94fb8128cfcc8e79e6c540aa762ddcf64
WIF: L1ozkMNDweE1F3wMMYm4qXrkgnpQDRX1RVx29RHmb5mFDHLKwhQ1
entropy hash: a5138d23c4ac92919ed8194a6f2c775e
entropy source: MD5 of the favorite block's answer, TOMI, three words and the last seven characters of the block 50 key

Transactions

funding2019-04-190.007 BTC04b6f17719…c1bd38
claim2019-04-190.00688851 BTC090d778d87…4e0370

Hints

undated
officialQuestion: What is my favorite block?
Sourcereddit.com/r/bitcoinpuzzles/comments/bexc8c/7_mbtc_quizchain_block_51
Published answer
Solution was block 21 with "Second" as a solution, and the TOMI field was "title on cover".
Sourcereddit.com/r/bitcoinpuzzles/comments/bexc8c/7_mbtc_quizchain_block_51
undated
official[solution] is not number of block, but [solution] of that block. TOMI field is necessary to stop people from just brute forcing with all 50 solutions, which I assume to be in a script cracking list somewhere. It has the format [word1 word2 word3], with all words in lower case.
Sourcereddit.com/r/bitcoinpuzzles/comments/bexc8c/7_mbtc_quizchain_block_51
undated
officialLink is zGVQQgk for this one.
Sourcereddit.com/r/bitcoinpuzzles/comments/bexc8c/7_mbtc_quizchain_block_51