That was the information I was trying to (too quickly) highlight. AWS sig v4 is specifically for authorising AWS requests, it's not portable. The concepts in t

That was the information I was trying to (too quickly) highlight. AWS sig v4 is specifically for authorising AWS requests, it's not portable. The concepts in the draft are very similar so this looks like the generic internet version of the AWS signing concept. It looks like the draft involves Amazon people too but I'm not sure which one was chicken or egg. NovemberWhiskey's comment highlights the specific differences better than I.