And that's fine. In fact, I would document the prefixes in the docs and make ot official.

I don't think the AKIA/ASIA prefix for AWS access keys is formalized, which may be a good example of this: https://github.com/localstack/localstack/blob/6f846a8278e439...

Its the kind of thing I would rather see a base64 coded bit of json for. Easy to understand for support and easy for clients debugging.