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by sturmeh
2083 days ago
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You could use a trusted / centralised source to produce a TOTP or some equivalent code, and generate some code alongside a timestamp, which would be verifiable. (You can't get the code ahead of time from the service, but can later verify a timestamp code combination.) Honestly, just emit the message in the Bitcoin blockchain and it will be there for perpetuity with a timestamp that is fully verifiable. |
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