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The Bitcoin Challenge: Solution to 0.1 BTC

by Michael October 10, 2018 No Comments

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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