quizchain/47

Solved on 2019-04-21 after 5d 2h 21m, key derived from the published recipe. 0.011 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.

Cross sum

"Another difficult math problem. 1231". 11 mBTC, for the 7 in 47.

After the MATH hat blocks, everyone looked for a trick. There wasn't one. The cross sum is 7, and the field is cross sum. It held five days.

The author's verdict on three blocks in one post: not successful. Blocks 48 to 50 went up the same way anyway.

IDquizchain/4747 / 772019-04-16 → 2019-04-21

Puzzle / quizchain

47

bitcoinp2pkh solved

Record

bitcoinPuzzle({
  address: p2pkh("1J3sbaFiSpXg…5H8K9wkk", "bb0534ab470c…ef73e13f"),
  status: Status.Solved,
  key: wif("L54ym5FMKYso…5P5fCnpv").entropy("b90d7abff767…f067f6d0", source("https://www.…5_to_47/")).derived(),
})

Prize: 0.011 BTC
Key material: wif, derived from the recipe
Verification: verified
Solved: 2019-04-21 · 5d 2h 21m

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/bitcoinpuzzles/comments/bdrcj7/7_mbtc_7_mbtc_11_mbtc_quizchain_blocks_45_to_47; Tryquizchain/47 in the playground

Address: 1J3sbaFiSpXgK49nBxonuLMqRw5H8K9wkk

hash160 bb0534ab470c74869eea305e2a2f196bef73e13f

Balance

asking the explorer

Key

public key · compressed: 037690efde51280c48e3fa7aec3eff86887a10e1b3438b26b2fb8b5b1f1a1cd926
WIF: L54ym5FMKYsoLK48wMXoprMNV19kjTE8kDqUk5Hm5bih5P5fCnpv
entropy hash: b90d7abff767a00f34fdddd2f067f6d0
entropy source: MD5 of the cross sum, BFUB, the two words and the last seven characters of the block 46 key, separated by spaces

Transactions

funding2019-04-160.011 BTCf0e7f3f0fa…41b92e
claim2019-04-210.01082144 BTC9ffd2697c0…c4fca1

Hints

undated
officialQuestion: Another difficult math problem. 1231
Sourcereddit.com/r/bitcoinpuzzles/comments/bdrcj7/7_mbtc_7_mbtc_11_mbtc_quizchain_blocks_45_to_47
Published answer
The solution was rather simple. Only one digit, the number 7, as the cross sum of the number posted in the question.
Sourcereddit.com/r/bitcoinpuzzles/comments/bdrcj7/7_mbtc_7_mbtc_11_mbtc_quizchain_blocks_45_to_47
undated
officialBFUB will be four or less words, all of them lower case and seperated by one space, if there are two or more.
Sourcereddit.com/r/bitcoinpuzzles/comments/bdrcj7/7_mbtc_7_mbtc_11_mbtc_quizchain_blocks_45_to_47
Published answer
"7 BFUB cross sum adyH5bR"
Sourcereddit.com/r/bitcoinpuzzles/comments/bdrcj7/comment/elemz19
undated
officialFirst two digits of hash: b9
Sourcereddit.com/r/bitcoinpuzzles/comments/bdrcj7/7_mbtc_7_mbtc_11_mbtc_quizchain_blocks_45_to_47