[Kenji]

I speculate that these are only SHA256 hashes of keys or documents that will be released in the future. It's pre-commitment. I didn't try decrypting one of the files with a key yet, though. I'm busy with other things (like browsing HN, aaah).

[the_duke]

The tweets are just hashes of the insurance files to confirm their validity, not the decryption keys (yet).