quizchain2/3

Solved on 2019-05-12 after 1h 26m, key published. 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 dirty word, safe for work

Block 3 went up 18 minutes after block 2, back at 7 mBTC. The question: "dirty word with XA". The post promises "No, not that kind of dirty word, this is safe for work." The link is the first run's block 76 key again.

So what's XA? Atbash. Flip the alphabet, A becomes Z, X becomes C. XA is CZ, as in CZ of Binance.

Reorg

Binance had just been hacked, and there was talk of a Bitcoin chain reorg to undo it. CZ later apologized for even using that "dirty word". So the solution is reorg and the TOMI field is CZ Binance.

u/Pr0m3th3on solved it. Their first puzzle ever. The claim confirmed at 02:12:14 UTC, and the comment says the claiming part took longer than the solving: their wallet was at home and they were on a work laptop. "VICTORY IS MINE." Fair.

The author's verdict? Without the Atbash twist it would have been too obvious. And for a harder version, the TOMI field could have been Atbash CZ.

Nobody printed the block 3 key in this thread. It shows up in the next one, because block 4's answer hides inside it.

IDquizchain2/303 / 102019-05-12

Puzzle / quizchain2

3

bitcoinp2pkh solved

Record

bitcoinPuzzle({
  address: p2pkh("1FsYtK22FBG7…gDxXjwQX", "a3212ccf8438…e7713b58"),
  status: Status.Solved,
  key: wif("L488KiS3jUut…KrNLsFpT").entropy("5f6870da0f9c…9d79f9a6", source("https://www.…block_3/")),
})

Prize: 0.007 BTC
Key material: wif
Verification: verified
Solved: 2019-05-12 · 1h 26m

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/bitcoinpuzzles/comments/bnj8ew/7_mbtc_quizchain2_block_3; Tryquizchain2/3 in the playground

Address: 1FsYtK22FBG7Ps3K7KZUYDQRs6gDxXjwQX

hash160 a3212ccf8438536aa212e5a1adbca17de7713b58

Balance

asking the explorer

Key

public key · compressed: 02f4db70c3801528c31a79093e72b1bf9e9fe0c1e94e3539e0632eb338166a8701
WIF: L488KiS3jUut79rDM6gwxUdg7Qm1SXwQnMasKLpzFzb6KrNLsFpT
entropy hash: 5f6870da0f9c9553647e89c89d79f9a6
entropy source: MD5 of the word, TOMI, two words and the whole block 76 key of the first run

Transactions

funding2019-05-120.007 BTC5d3b46fa70…a5a089
claim2019-05-120.0069809 BTC581b85ceac…fbe718

Hints

undated
officialQuestion: dirty word with XA
Sourcereddit.com/r/bitcoinpuzzles/comments/bnj8ew/7_mbtc_quizchain2_block_3
Published answer
Solution was "reorg" and TOMI field was "CZ Binance". This used the recent news on the Binance hack and the discussion on doing a BItcoin chain reorg. CZ apologized for using this "dirty word". I have not much to add, except that the "XA" in the question was "CZ" in Atbash code.
Sourcereddit.com/r/bitcoinpuzzles/comments/bnj8ew/7_mbtc_quizchain2_block_3
undated
officialFormat: [solution] TOMI [TOMI] [link]
Sourcereddit.com/r/bitcoinpuzzles/comments/bnj8ew/7_mbtc_quizchain2_block_3
Published answer
reorg TOMI CZ Binance L2e6gPSXnq7KJBfkoD7cHGVZuhRUDARJz2Cc9JcSNLsKRZhH552F
Sourcereddit.com/r/bitcoinpuzzles/comments/bnj8ew/comment/en6delr
undated
officialUse the private key from block 76 for this again as a link. That private key is L2e6gPSXnq7KJBfkoD7cHGVZuhRUDARJz2Cc9JcSNLsKRZhH552F.
Sourcereddit.com/r/bitcoinpuzzles/comments/bnj8ew/7_mbtc_quizchain2_block_3
undated
officialFirst three digits of MD5 hash are 5f6.
Sourcereddit.com/r/bitcoinpuzzles/comments/bnj8ew/7_mbtc_quizchain2_block_3
undated
officialFirst digit of solution only MD5 hash is 1.
Sourcereddit.com/r/bitcoinpuzzles/comments/bnj8ew/7_mbtc_quizchain2_block_3
undated
officialFIrst digit of TOMI only MD5 hash is 0.
Sourcereddit.com/r/bitcoinpuzzles/comments/bnj8ew/7_mbtc_quizchain2_block_3