quizchain/40

Solved on 2019-04-14 after 1h 10m, 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.

hit

"Three letter word starting with h and ending with t." Only three candidates, so it needs a field.

The answer is hit, which the author spotted in the block 39 key. The field is the three characters after it there, BMX. No link in the post, you had to solve block 39. It fell 26 minutes after block 39.

IDquizchain/4040 / 772019-04-14

Puzzle / quizchain

40

bitcoinp2pkh solved

Record

bitcoinPuzzle({
  address: p2pkh("1CAYmTna2haJ…Gw8Mmeqk", "7a77a50a21d5…e4dc2b7c"),
  status: Status.Solved,
  key: wif("L3juV44PrD3f…of6mHALc").entropy("21f5fc1446eb…6a4c7914", source("https://www.…lock_40/")).derived(),
})

Prize: 0.007 BTC
Key material: wif, derived from the recipe
Verification: verified
Solved: 2019-04-14 · 1h 10m

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/bitcoinpuzzles/comments/bd2ug5/7_mbtc_quizchain_block_40; Tryquizchain/40 in the playground

Address: 1CAYmTna2haJvGNE83pmRmwfAMGw8Mmeqk

hash160 7a77a50a21d5ab27f289a1c2e034228ae4dc2b7c

Balance

asking the explorer

Key

public key · compressed: 02ddfb547cfb77ec443637ed908bc8fb21d9779929c596083088244473cb7d85b6
WIF: L3juV44PrD3fyUTYy2Ax8Z3nURNV7gLRRcbVYkqGACkLof6mHALc
entropy hash: 21f5fc1446eb53170e4331c46a4c7914
entropy source: MD5 of the word, BFUB, the three characters after it in the block 39 key and the last three characters of that key, separated by spaces

Transactions

funding2019-04-140.007 BTC7b186c9a4d…5e086e
claim2019-04-140.00666438 BTCf63d705638…559a4b

Hints

undated
officialQuestion: three letter word starting with h and ending with t
Sourcereddit.com/r/bitcoinpuzzles/comments/bd2ug5/7_mbtc_quizchain_block_40
Published answer
The solution was the word "hit", since I noticed again that this word turned up in the private key of block 40.
Sourcereddit.com/r/bitcoinpuzzles/comments/bd2ug5/7_mbtc_quizchain_block_40
undated
officialBFUB is three capital letters. If you found the solution the correct way, you will find those three letters easily.
Sourcereddit.com/r/bitcoinpuzzles/comments/bd2ug5/7_mbtc_quizchain_block_40
Published answer
Three digits of previous block private key following "hit" found there.
Sourcereddit.com/r/bitcoinpuzzles/comments/bd2ug5/comment/ekxgugv
undated
officialLink from last block: Not provided this time, you need to solve last block to challenge this one.
Sourcereddit.com/r/bitcoinpuzzles/comments/bd2ug5/7_mbtc_quizchain_block_40