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Sign bytes makes a lot of sense. But you’re still on your own for how that “should” be done.

Obviously you need to build and hash the pairs and not just key values. But the order is obviously important too.

Is there some standard for this I don’t know of?

Sort the keys alphabetically usually comes up.

Hmm, interesting idea but I’m in embedded C. So that’s something I’d rather not do but I like the idea.

You generally don't need canonical representation.