quizchain2/7

Solved on 2019-05-17 after 1d 13h 57m, 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.

Name the scam coin

Block 7, lucky number, 77 mBTC. The post is a joke. "Let's start a new altcoin. So I can start scamming large numbers of suckers." The question: find the coin's name, starting from "Bitcoin".

The format is strict. [solution] TOMI [TOMI], capitalized like Bitcoin. The TOMI field is three words in alphabetical order, one capitalized. Prefixes df1, 5 and e.

Players went everywhere. NakamotoAoi_coin. BitConnect, because scam. Bytecoin. All reasonable, all wrong.

The next day the author posted a hint. The first name idea was Hascoin: shift each letter of "Bit" one back in the alphabet and reorder. The real name comes from "Bit" in a similar way, and it's tied to a famous puzzle.

The claim confirmed 22 minutes later, at 13:22:07 UTC. Then u/mooncritic posted how. Atbash turns BIT into YRG. Rearrange it and you get GRY. The famous puzzle is the "-gry puzzle": angry, hungry, and what's the third? So the string is Grycoin TOMI angry Atbash hungry. "Solved by human thinking. Beep boop!"

The author replied "Good job". Then came the feedback. Too hard without the hint, too easy with it. The scam framing pushed everybody the wrong way. u/puzzleponky wrote a careful note on hints: give less, you can always add more. The author agreed.

Grycoin stuck, by the way. It became the name of the author's altcoin project.

IDquizchain2/707 / 102019-05-15 → 2019-05-17

Puzzle / quizchain2

7

bitcoinp2pkh solved

Record

bitcoinPuzzle({
  address: p2pkh("1MgqS8ng87o9…G9KvJ1Ff", "e2eb2b16530d…e742e657"),
  status: Status.Solved,
  key: wif("L5MJPrKiqPre…QNJm6KD2").entropy("df14b6d31d10…25c4601a", source("https://www.…block_7/")).derived(),
})

Prize: 0.077 BTC
Key material: wif, derived from the recipe
Verification: verified
Solved: 2019-05-17 · 1d 13h 57m

tx 2

Trail: Explorerblockstream.info; Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/77_mbtc_quizchain2_block_7; Tryquizchain2/7 in the playground

Address: 1MgqS8ng87o9JVNkaKhtBFXigYG9KvJ1Ff

hash160 e2eb2b16530d257f0a6599ce83ab109ae742e657

Balance

asking the explorer

Key

public key · compressed: 03c9586e34cdc2fd0b8c2652a8296022996d462eef025ecb4e55c3cad282a8feaf
WIF: L5MJPrKiqPreFJJPFzASnb9Ru1QfqeVRwnHbLo18yPZpQNJm6KD2
entropy hash: df14b6d31d10082629fefa7f25c4601a
entropy source: MD5 of the coin name, TOMI and three words

Transactions

funding2019-05-150.077 BTCfe9bec614b…a2e8f9
claim2019-05-170.07650961 BTC4958e07078…21ac30

Hints

undated
officialThe question is to find the name for that altcoin, starting out from the name "Bitcoin".
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/77_mbtc_quizchain2_block_7
Published answer
Atbash of BIT is YRG. YRG can be rearranged to GRY.
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/comment/enwmri7
undated
officialFormat: [solution] TOMI [TOMI]
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/77_mbtc_quizchain2_block_7
Published answer
Grycoin TOMI angry Atbash hungry
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/comment/enwmri7
undated
official[solution] is capitalized like "Bitcoin", which means only first letter in capitals.
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/77_mbtc_quizchain2_block_7
undated
official[Tomi] are three words in alphabetical order [word1 word2 word3], with one of them starting with a capital letter like the solution and the other two in all lower case.
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/77_mbtc_quizchain2_block_7
Published answer
For the TOMI, the two words that end in -gry are angry and hungry. Since I got to Gry using Atbash, I tried the word Atbash as well, and I organized these words in alphabetical order.
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/comment/enwmri7
undated
officialFirst three digits of MD5 hash are df1.
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/77_mbtc_quizchain2_block_7
undated
officialFirst digit of solution only MD5 hash is 5.
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/77_mbtc_quizchain2_block_7
undated
officialFirst digit of TOMI field only MD5 hash is e.
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/77_mbtc_quizchain2_block_7
undated
officialWhen I first thought about an altcoin project, I wanted to call it Hascoin. That was derived from moving the letters in the "Bit" part of Bitcoin one place to the left in the alphabet, then changing the order to make it easier to pronounce.
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/comment/enwjga0
undated
officialThe format of the solution is also Xxxcoin, with three different letters replacing the BIt part, and these letters being derived directly from "Bit".
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/comment/enwjga0
undated
officialOnce you find the method for deriving it, you will be left with several choices. And the one I chose will have a clear relation to puzzles. There will be a famous puzzle associated with this choice, which is why I went with it.
Sourcereddit.com/r/bitcoinpuzzles/comments/bp8jlh/comment/enwjga0