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Why not just timestamp it with RFC 3161 timestamp server? BitCoin sounds like a bit of an overkill here.

Or, for most people, just tweet a hash

Or a combined hash with the NIST randomness beacon. https://beacon.nist.gov/home

Actually, uploading to Bitcoin is tantamount to using the NIST randomness beacon since the NIST randomness beacon is injected into Bitcoin: https://github.com/opentimestamps/nist-inject

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