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Comment by graypegg | Hacker News Reader

An audio file being checked into a block in a blockchain doesn’t prove an interaction happened at that time, it only proves an audio file was checked into a block at that time.

Especially so if the audio file contains only your voice so there’s not context.

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What it DOES do is confirm that this audio recording DID EXIST at that time entered into the timestamped blockchain — or even a hash of the audio file (for less bits/txn fee).

According to a Tom Scott's video[1], you can use background noise emitted by electricity to prove that a recording has been taken at a certain time and place.

[1]: https://youtu.be/e0elNU0iOMY

You check the hash of the audio into the chain.

Same problem. Doesn't prove that it was created at that point, only that it existed at that point.

Yep. As I stated, you can falsify an event happening later than it really did by prerecording and only uploading later, but you can't fake that it happened after uploading. With clever cross-referencing, it might even be possible to prove decisively when the file was created.

Post the hash online?

Because the audio is only your half of the conversation, you could just record what would be convenient to have said before the conversation, then say something different, and just upload your prepared file.

It’s not like just because it’s in a blockchain, its content is truthful. It just confirms it followed the rules of the blockchain.

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