500 OKCash Cryptonize puzzle
Puzzle address: PVjtBKJ6X5HmZMmUqkj8mdyptrSxNSjXVA
Solved: 2019-04-19
Special thanks to Crypto_Puzzles community:
Discord: https://discord.gg/e2AMKKt
Site: https://cryptopuzzles.org/
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Reddit: https://www.reddit.com/r/Crypto_Puzzles
South America - START
Increase HSV value channel of png image from Medium post to get hidden text. Though jpeg image from Imgur link doesn't contain color string, it looks like color data were lost after jpeg compression. That text is the first part of private key: 7AAjZLjXT3.
Africa
Just scan QR-code to get part of the private key: NN.
Australia
After scanning QR-code we get text: https://medium.com/@cryptonize. Visit that link and notice alphanumeric string next to Discord link. It looks like normal Base58, except zeros. The hint under QR-code literally says "minus found minus congrats" and as you see there are reversed "found" and "congrats" on both ends of string. After removing that words we get third part of the private key: n6ztSZ34iB.
Asia
Asia contains two parts of private key, one is in plain sight and one is drawing by dashed line: ypfUm2UNx9 and g3.
Europe
There is slogan: "coins!games!fun!". Just take first letter of every word to get part of private key: cgf.
Iceland
To reveal this part we need to manipulate color channels of image again (png, not jpeg one). Extract HSV saturation channel to get part of private key: P9x1.
North America - FINISH
One more QR-code contains Discord invite link: https://discord.io/cryptonize Under QR-code there is hint #welcome pointing us to certain Discord channel with channel topic. The last part of private key: obtAfukZb4.
Combine all parts together to get the private key: 7AAjZLjXT3NNn6ztSZ34iBypfUm2UNx9g3cgfP9x1obtAfukZb4.
Acknowledgements
Thanks to Cryptonize community for creating this puzzle.