None should be at all.
Discussion
On amethyst, it's literally a feature. I can click and timestamp your notes like I just did.
I see that button which is odd. The only thing that should be hashed to a blockchain is transactions. Anything else should be unacceptable. Blockchain wasn't meant to be used like this which is alarming.
Anybody can take any information and hash it to add to the OTS tree. It's not something Amethyst is necessarily doing, though, Amethyst does support doing it.
OTS is going to add a merkle root. Adding additional hashes to the tree doesnt take up additional space on chain.
It doesnt matter how you feel about whether or not it should be in the chain. The stamp will be created and if you publish anything digital, that has potential to be added to the chain by anyone.
Yeah thats a problem right there. I imagine that will be how the governments will destroy the economy & we will all be broke except them. Bitcoin can't last w a blockchain.