quizchain2/62

Solved on 2019-07-08 after 5h 8m, 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.

77

July 8, 2019. After two big blocks, a normal one. The question is 77. Format (solution), no TOMI field, digits bf4.

The answer is Tanabata, the Japanese festival of July 7. The day stage one of block 77 came out, and the day of its rapid fire hints. Of course it's 77.

Bad miner

u/userm1010110 wrote "Solved it." four minutes after the post. Then nothing happened. A few hours later: someone sent a competing transaction, and that one confirmed. "Bad miner!"

The claim confirmed at 04:44:50 UTC, 44 minutes after the post, and the address wasn't theirs. "I lost this one though thought that it's easy." In the block 61 thread they asked the author to avoid confirmation races. The author's answer? Not much to do about that.

IDquizchain2/6262 / 772019-07-07 → 2019-07-08

Puzzle / quizchain2

62

bitcoinp2pkh solved

Record

puzzle({
  chain: "bitcoin",
  address: "1FPi8gMKZLD6…yXpg4Ff7",
  status: Status.Solved,
  key: wif("KwvhXWUQG4Gg…tmAPgJse").entropy("bf472225686e…9fcc3cbb", source("https://www.…lock_62/")).derived(),
})

Prize: 0.007 BTC
Key material: wif, derived from the recipe
Verification: verified
Solved: 2019-07-08 · 5h 8m

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/Grycoin/comments/cag7u1/7_mbtc_quizchain2_block_62; Tryquizchain2/62 in the playground

Address: 1FPi8gMKZLD61dU3Zeb9vrwDc6yXpg4Ff7

hash160 9ddd3f6a92689057dd3cad1b899e839f112110e1

Balance

asking the explorer

Key

public key · compressed: 0213ff8008f9ee03bd71ee0c7e6b0fe9729cbfc9543f3f238f092783ecb6d874ff
WIF: KwvhXWUQG4Gg3S3TomjZh68Qq48AEAj6huCWWqMwC17ztmAPgJse
entropy hash: bf472225686e7f9edca7e4c79fcc3cbb
entropy source: MD5 of the one word

Transactions

funding2019-07-070.007 BTC1789a6b338…16557f
claim2019-07-080.00621357 BTCd79d063f2c…f403db

Files

Techniques

md5-to-bip39-entropypuzzlereddit.com/r/Grycoin/comments/cag7u1/7_mbtc_quizchain2_block_62

Hints

undated
officialQuestion: 77
Sourcereddit.com/r/Grycoin/comments/cag7u1/7_mbtc_quizchain2_block_62
Published answer
Solution was Tanabata, which is the name of the festival held on July 7 in Japan.
Sourcereddit.com/r/Grycoin/comments/cag7u1/7_mbtc_quizchain2_block_62
undated
officialFormat: (solution)
Sourcereddit.com/r/Grycoin/comments/cag7u1/7_mbtc_quizchain2_block_62
undated
officialFirst three digits of MD5 hash are bf4.
Sourcereddit.com/r/Grycoin/comments/cag7u1/7_mbtc_quizchain2_block_62