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Re:Ask HN: Secret messages in public forums by rococode on Thursday January 16, 2020 @02:51AM (#22062454)
There was a mysterious sub on Reddit that had random encrypted messages being posted. I believe the original sub is private now but the sub that discussed it is still up, /r/Solving_A858.

https://old.reddit.com/r/Solving_A858/

Re:Ask HN: Secret messages in public forums by thecupisblue on Thursday January 16, 2020 @05:33AM (#22063280)
Saw it once, I think it might be someone's storage. Use reddit to save hashed data. Or DNS!