I was not saying that the signature is _just_ at a commit level ("patches" being the DARCS lingo). DARCS, just as git, has tags for that. A tag depends on all

I was not saying that the signature is _just_ at a commit level ("patches" being the DARCS lingo). DARCS, just as git, has tags for that. A tag depends on all previous patches, so a signed tag guarantees just the same as a signed git tag does. In that regard, git is strictly less powerful.