A guy named Pip presented a new Bitcoin riddle just a week ago, on October, 2nd. The reddit post can be accessed by clicking https://www.reddit.com/r/Bitcoin/comments/9kq7it/introducing_the_310_btc_bitcoin_challenge/?sort=new
And the main price are 310 BTC. Furthermore there are 3 minor prices which are worth 0.1, 0.2 and 0.31 BTC.
The 0.1 BTC riddle has already been solved and I want to share the very interesting solution with you. Please view the puzzle’s website for a description of the problem: https://bitcoinchallenge.codes/
The solution to the 0.1 BTC riddle
1) At the bottom center of the image you can find the following grid of characters.
| 511 | B20 | 332 | 328 | 410 | 530 |
| 22B | 0FE | 52E | D0F | 7A1 | 65B |
| 52C | 7E7 | 511 | 2F6 | 56F | C4B |
These sets of three characters can be interpreted as hex values. However they don’t make much sense yet.
2) However above the table, you can find the text Oct 2 2018 if you look very closely.
3) We write the date as 20181002 and use it multiple times as a key to shift the original hex values.
| Original | 511 | B20 | 332 | 328 | 410 | 530 |
| Shift key | 201 | 810 | 022 | 018 | 100 | 220 |
| Decrypted | 310 | 310 | 310 | 310 | 310 | 310 |
| Original | 22B | 0FE | 52E | D0F | 7A1 | 65B |
| Shift key | 181 | 002 | 201 | 810 | 022 | 018 |
| Decrypted | 1AA | 0FC | 32D | 5FF | 78F | 643 |
| Original | 52C | 7E7 | 511 | 2F6 | 56F | C4B |
| Shift key | 100 | 220 | 181 | 002 | 201 | 810 |
| Decrypted | 42C | 5C7 | 490 | 2F4 | 36E | 43B |
4) The first decrypted line of the table clearly shows that we are on the right way. We omit the first line now and convert the hex to decimal. You can do this by using the website https://www.binaryhexconverter.com/hex-to-decimal-converter for example.
| Hex | 1AA | 0FC | 32D | 5FF | 78F | 643 |
| Decimal | 426 | 252 | 813 | 1535 | 1935 | 1603 |
| Hex | 42C | 5C7 | 490 | 2F4 | 36E | 43B |
| Decimal | 1068 | 1479 | 1168 | 756 | 878 | 1083 |
5) With the decimal values we can now create 12 seed words using the table on this website: https://github.com/bitcoin/bips/blob/master/bip-0039/english.txt
This gets us:
cry buyer grain save vault sign lyrics rhythm music fury horror mansion
Finally we have created the 12 word seed phrase for the 0.1 BTC wallet.
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