Why? Because the timestamp should commit to all the content, including the image itself.
For example, here's a lovely photo of São Paulo:
At any moment it could be undetectably replaced with a photo of Craig Wright! With hashes, we can detect such treachery. Without, we must trust @k00b
Good point! Linking to an external source is a gap in integrity
don't trust @k00b
https://github.com/stackernews/stacker.news/issues/657
So images are always hosted on stacker.news servers? It's not like the OP can change the image later or if OP gets hacked, attacker can change the image. Only @koob or someone who hacks koob can change the image?
https://m.stacker.news/6136