quizchain/19

Solved on 2019-04-10 after 0s, 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.

A second prize

Multiple choice with two options, second and Second, and the post more or less tells you it's the capital one. "Obvious at first sight."

The catch is the link. You need the key of block 18 first, so this was a bonus for whoever cracked it. And that's exactly what happened: the claim landed in the same Bitcoin block as block 18's claim and as this block's own funding.

IDquizchain/1919 / 772019-04-10

Puzzle / quizchain

19

bitcoinp2pkh solved

Record

bitcoinPuzzle({
  address: p2pkh("1MTh3kQjS14L…WGDim1La", "e06ec2b3dde7…cfd86d06"),
  status: Status.Solved,
  key: wif("L5JhgYPfwdjD…e5j6A6AX").entropy("db8042ccb8c1…2daa0053", source("https://www.…lock_19/")).derived(),
})

Prize: 0.007 BTC
Key material: wif, derived from the recipe
Verification: verified
Solved: 2019-04-10 · 0s

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/bitcoinpuzzles/comments/bbkh2q/exceedingly_easy_7_mbtc_quizchain_block_19; Tryquizchain/19 in the playground

Address: 1MTh3kQjS14L9kvEUrFkYGiNdcWGDim1La

hash160 e06ec2b3dde7c569313fa2b86395b596cfd86d06

Balance

asking the explorer

Key

public key · compressed: 03b9f9f0b7b70e97aa41dec7623b78acfbe02e54cb12cc051e75d7387b30a43b65
WIF: L5JhgYPfwdjDBQNffXP7xTaSS1FxhXVrjZKQ9QGsXeZue5j6A6AX
entropy hash: db8042ccb8c1a645704170062daa0053
entropy source: MD5 of the second alternative, a space and the last three characters of the block 18 key

Transactions

funding2019-04-100.007 BTCf68bc202e5…95f674
claim2019-04-100.00669472 BTCdae4dd121c…795b2b

Hints

undated
officialQuestion: Multiple choice, two alternatives. a) second b) Second
Sourcereddit.com/r/bitcoinpuzzles/comments/bbkh2q/exceedingly_easy_7_mbtc_quizchain_block_19
Published answer
Second.
Sourcewattpad.com/720895205-second-complete-quizchain
undated
officialFirst alternative is second, and second alternative is Second. Hint: I don't think the first alternative is correct in this case, the second one looks much more promising. Format [solution] [link] with exactly one space between them. Hash with MD5 like with all blocks since 15.
Sourcereddit.com/r/bitcoinpuzzles/comments/bbkh2q/exceedingly_easy_7_mbtc_quizchain_block_19