You really do not need anything that complicated (definitely not a block chain, when you only need the merkle tree). All of this is exactly what cryptographic signatures are for, a tech that is decades old.

And as mentioned in the above comments, it does not help with analog loopholes and trust in the person being photographed.

The blockchain provides an immutable public record. Yes, not necessary but still an interesting approach and actually a decent fit for a blockchain. A blockchain might still be an over fit but it's useful if I claim to have an undoctored video at a certain point in time but don't want to release it, immediately, and need a distributed way to validate that claim.

> And as mentioned in the above comments, it does not help with analog loopholes and trust in the person being photographed.

Like I said in my above comment, it doesn't solve all of the problems but at least we can begin establishing a record of source.

I am pretty sure that what you are calling a block chain is actually just a single hash or at most a Merkle tree. You do not need a consensus algorithm (PoW or PoS or whatever), i.e. you do not need a block chain if all you want is decentralized verification of a current or future publication.

I was just making an arbitrary suggestion based on previous work by proofofexistence.com. I didn't suggest it was the only way or the best way forward.

I realize that people all the time try to say "Blockchain would be great for ____" so you're probably a little hypersensitive and I get that, but the suggestion of a blockchain was arbitrary and tangential to the real point of my post, so I don't really feel like getting into it right now.