Another question:
In CAIP-10 you use underscores like "account_id" but in the data model of the CAIP-122 you use dashs like "expiration-time". I think there should be a naming convention that says either or?

I think CAIP-122 was modeled on EIP-4361, where "address" was used-- it would be more consistent with CAIP-10 (and more chain-agnostic) to call it an account_id tho, since that's what you're authenticating? feel free to open a PR for this.

as for the convention, there isn't one project-wide or org-wide. maybe there should be? if you open a separate PR on https://github.com/ChainAgnostic/CAIPs/blob/main/CONTRIBUTING.md#style-guide I will shop it around to other contributors and if it gets traction I will update all pre-final CAIPs accordingly. I don't know that an org-wide convention for property names/syntaxs makes a lot of sense because many of those have to conform to use-case-specific conventions and user/dev expectations, but definitely the "internal stuff" like how we refer to components of a CAIP scheme definitely would benefit from a convention!