It's a hash of everything that goes into a commit, including the commit message. The idea is that nothing that makes up a commit can change without changing the hash.
> It's a hash of everything that goes into a commit, including the commit message
... and, very notably, the hash of the parent commit. That is also part of the commit, which means that changing a parent commit would also imply changing the hashes of all later commits. This is sort of the whole point of git/version control.
This might be a stupid question, but does anyone call git history a blockchain, then? A centralized blockchain, without proof of work or proof of anything really of course, but still, it sounds like the basic blockchain idea is there
... and, very notably, the hash of the parent commit. That is also part of the commit, which means that changing a parent commit would also imply changing the hashes of all later commits. This is sort of the whole point of git/version control.