quizchain2/50

Solved on 2019-06-26 after 7h 6m, 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.

Twenty-one ones

June 26, 2019. The post starts with an apology for block 49 and its leaked TOMI field. No extra prize for that mistake, though. Then the question: 111111111111111111111. Twenty-one ones. Digits c32, 8 and 64.

Just a number? Not quite.

The checksum

Twenty-one ones are a valid Bitcoin address, almost. A block explorer completes it to 1111111111111111111114oLvT2. The missing part is the checksum. So the answer is 4oLvT2, and the TOMI field is address checksum. The author found the trick in an old Bitcointalk post about address checksums.

u/BrainForceOne explained the solve right after the claim confirmed, at 06:51:06 UTC, under three hours after the post. The claim paid their 1Thanksg9t4MRoCH2CM3cArWq26JiNvMY again. "This one was a good one", wrote another player. Hard to argue.

IDquizchain2/5050 / 772019-06-25 → 2019-06-26

Puzzle / quizchain2

50

bitcoinp2pkh solved

Record

puzzle({
  chain: "bitcoin",
  address: "1FGJhLU2gR2u…bFJsvqGS",
  status: Status.Solved,
  key: wif("L56xZ3ZN8Js4…C95VBzUg").entropy("c3260755c216…c119814b", source("https://www.…lock_50/")).derived(),
})

Prize: 0.007 BTC
Key material: wif, derived from the recipe
Verification: verified
Solved: 2019-06-26 · 7h 6m

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/Grycoin/comments/c5kst3/7_mbtc_quizchain_2_block_50; Tryquizchain2/50 in the playground

Address: 1FGJhLU2gR2ucNbWsayA5pV15WbFJsvqGS

hash160 9c76c595614817a1fb37904cf4679a182894d0c7

Balance

asking the explorer

Key

public key · compressed: 030ce01cec5d184e734c75768e3f25d6eb68f44ed09f567172047a9528445effc0
WIF: L56xZ3ZN8Js4i3rzpY2d5W6KtRBTcgesPPvhnkqrGLoCC95VBzUg
entropy hash: c3260755c216f2e1b081b2fac119814b
entropy source: MD5 of the checksum, TOMI and two words

Transactions

funding2019-06-250.007 BTC7c3aa2558e…3266f9
claim2019-06-260.006736 BTC1f69eaad13…25be76

Files

Techniques

md5-to-bip39-entropypuzzlereddit.com/r/Grycoin/comments/c5kst3/7_mbtc_quizchain_2_block_50

Hints

undated
officialQuestion: 111111111111111111111
Sourcereddit.com/r/Grycoin/comments/c5kst3/7_mbtc_quizchain_2_block_50
Published answer
As explained by the winner in a comment below, solution was "4oLvT2" and TOMI field was "address checksum".
Sourcereddit.com/r/Grycoin/comments/c5kst3/7_mbtc_quizchain_2_block_50
undated
officialFormat: [solution] TOMI [TOMI]
Sourcereddit.com/r/Grycoin/comments/c5kst3/7_mbtc_quizchain_2_block_50
Published answer
4oLvT2 TOMI address checksum
Sourcereddit.com/r/Grycoin/comments/c5kst3/comment/es2q2li
undated
officialFirst three digits of MD5 hash are c32.
Sourcereddit.com/r/Grycoin/comments/c5kst3/7_mbtc_quizchain_2_block_50
undated
officialFirst digit of solution only Md5 hash is 8.
Sourcereddit.com/r/Grycoin/comments/c5kst3/7_mbtc_quizchain_2_block_50
undated
officialFirst two digits of TOMI field only MD5 hash are 64.
Sourcereddit.com/r/Grycoin/comments/c5kst3/7_mbtc_quizchain_2_block_50