quizchain2/61

Solved on 2019-07-10 after 3d 17h 38m, key derived from the published recipe. 0.077 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.

A number

July 7, 2019, 7 pm Japanese time. The luckiest slot of the whole run, so block 61 pays 77 mBTC. Partly luck, partly an apology for the wrong digits in block 59. The question is A number. Format [solution] TOMI [TOMI], digits 06d, and 4b for the TOMI field alone.

"May even be solved at sight", says the author. Was it? Not even close. Three days of guessing follow.

The smallest hint ever

Hint 1: the most important number in the history of humanity. Players try pi, the golden ratio, the Big Bang. Hint 2 is a single dot. Just a dot, below the text. "That's a period", says u/martypyouknowme. Thanks.

Hint 3 points back to block 57, Hal's tweet about CO2. So the number is 350, the safe level of CO2 in parts per million. The dot was the TOMI field all along: .org, as in 350.org.

u/JDScreesh got it. The claim confirmed at 20:28:04 UTC on July 10. Their second block ever, after block 75 of the first run. "Now I can solve some money problems." Fair enough.

And u/reddeneer noticed something the author missed: 1.618, the golden ratio, has 61 right in the middle. Wrong answer, perfect fit.

IDquizchain2/6161 / 772019-07-07 → 2019-07-10

Puzzle / quizchain2

61

bitcoinp2pkh solved

Record

puzzle({
  chain: "bitcoin",
  address: "1CKDiWxbYF8v…eNaqj4yU",
  status: Status.Solved,
  key: wif("KyfhrSRoruWD…tzFyJrRn").entropy("06da9c6f65b6…43a6e24e", source("https://www.…lock_61/")).derived(),
})

Prize: 0.077 BTC
Key material: wif, derived from the recipe
Verification: verified
Solved: 2019-07-10 · 3d 17h 38m

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/Grycoin/comments/ca58xg/77_mbtc_quizchain2_block_61; Tryquizchain2/61 in the playground

Address: 1CKDiWxbYF8v5KShLTJkuMqDkxeNaqj4yU

hash160 7c1b7c4d0fe68cfb21d1fda112aa7449eb07121d

Balance

asking the explorer

Key

public key · compressed: 02c6c0b2c8bc4fa7faab53a50c0c24756798a2503d955f608ae2ec6c7e55f72e6a
WIF: KyfhrSRoruWDzWinJdZCaQv1va2XCiraxJfYzDwtJ3R7tzFyJrRn
entropy hash: 06da9c6f65b60920eefcdf2443a6e24e
entropy source: MD5 of the number, TOMI and .org

Transactions

funding2019-07-070.077 BTC4cd366e045…652d26
claim2019-07-100.07651357 BTCafe8352f96…7e8eaa

Files

Techniques

md5-to-bip39-entropypuzzlereddit.com/r/Grycoin/comments/ca58xg/77_mbtc_quizchain2_block_61

Hints

undated
officialQuestion: A number.
Sourcereddit.com/r/Grycoin/comments/ca58xg/77_mbtc_quizchain2_block_61
Published answer
As winner reports in comments, solution was 350 and TOMI was .org.
Sourcereddit.com/r/Grycoin/comments/ca58xg/77_mbtc_quizchain2_block_61
undated
officialFormat: [solution] TOMI [TOMI]
Sourcereddit.com/r/Grycoin/comments/ca58xg/77_mbtc_quizchain2_block_61
Published answer
350 TOMI .org
Sourcereddit.com/r/Grycoin/comments/ca58xg/comment/etghruh
undated
officialFirst three digits of MD5 hash are 06d (not copypasted but triple checked).
Sourcereddit.com/r/Grycoin/comments/ca58xg/77_mbtc_quizchain2_block_61
undated
officialFirst two digits of TOMI field only are 4b (not copypasted but double checked).
Sourcereddit.com/r/Grycoin/comments/ca58xg/77_mbtc_quizchain2_block_61
undated
officialHint: Not just any number, but the most important number in the history of humanity.
Sourcereddit.com/r/Grycoin/comments/ca58xg/77_mbtc_quizchain2_block_61
undated
officialHint 2: Smallest hint ever. If you look really hard, maybe you can see it below:
Sourcereddit.com/r/Grycoin/comments/ca58xg/77_mbtc_quizchain2_block_61
undated
official.
Sourcereddit.com/r/Grycoin/comments/ca58xg/77_mbtc_quizchain2_block_61
undated
officialSo here goes a more decisive hint on what this is about. "Most important number" does not mean much if you do not know what is important in my world. A clue to that is found in the last big block before this one (block 57), where I say that a certain problem seems to be important. Important enough to make it the topic of the 7 pm big block on Tanabata day.
Sourcereddit.com/r/Grycoin/comments/ca58xg/77_mbtc_quizchain2_block_61
undated
officialYes, only number, no other element. And actually no decimal point, I just said in the hint that the dot is in the TOMI field.
Sourcereddit.com/r/Grycoin/comments/ca58xg/comment/etf3gfj