quizchain/37

Solved on 2019-04-14 after 3h 11m, key derived from the published recipe. 0.01 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.

0o7

"James Bond", for 10 mBTC. The author tried to build the easiest possible block with a field.

The answer is oo7, because 0 is illegal in an address, and the field is 0o. A player got it from the author's remark that a two digit hint was a challenge. Three hours, and a long report on how to make the format better.

IDquizchain/3737 / 772019-04-14

Puzzle / quizchain

37

bitcoinp2pkh solved

Record

bitcoinPuzzle({
  address: p2pkh("18EmMJviXB6a…vgj2Mv7P", "4f634f444be3…9149704c"),
  status: Status.Solved,
  key: wif("L33R24DaXvjj…Z13QCnhd").entropy("3ccc475a0c33…0584a5ce", source("https://www.…lock_37/")).derived(),
})

Prize: 0.01 BTC
Key material: wif, derived from the recipe
Verification: verified
Solved: 2019-04-14 · 3h 11m

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/bitcoinpuzzles/comments/bcykn2/easy_7_mbtc_quizchain_block_37; Tryquizchain/37 in the playground

Address: 18EmMJviXB6akqNftbufhxWcLbvgj2Mv7P

hash160 4f634f444be3bac0061f5778d90288969149704c

Balance

asking the explorer

Key

public key · compressed: 021e57eeddbfc69764bc34baa33ac77b6b81cd368d835f2405b02d91fff76dc134
WIF: L33R24DaXvjjeuB145crhBsesGK435CJoTHHgCu5JvS7Z13QCnhd
entropy hash: 3ccc475a0c33eeefc5d33e7a0584a5ce
entropy source: MD5 of the answer, BFUB, the hint and the last three characters of the block 36 key, separated by spaces

Transactions

funding2019-04-140.01 BTC5654065b34…928bea
claim2019-04-140.00990554 BTCb7171416aa…398091

Hints

undated
officialQuestion: James Bond
Sourcereddit.com/r/bitcoinpuzzles/comments/bcykn2/easy_7_mbtc_quizchain_block_37
Published answer
The only point here to find the solution was to replace the 0 in 007 for o, since 0 is not allowed in Bitcoin addresses. From there on my BFUB hint was simply 0o, meaning replace 0 for o.
Sourcereddit.com/r/bitcoinpuzzles/comments/bcykn2/easy_7_mbtc_quizchain_block_37
undated
officialFormat: [solution] BFUB [BFUB string] [link] with exactly one space between them.
Sourcereddit.com/r/bitcoinpuzzles/comments/bcykn2/easy_7_mbtc_quizchain_block_37
undated
officialLink from Block 36:vXY First two digits of hash: 3c
Sourcereddit.com/r/bitcoinpuzzles/comments/bcykn2/easy_7_mbtc_quizchain_block_37