CAIP-211 adds the missing authority-negotiation layer beneath wallet sessions: a scope can now point not just to method names, but to ordered RPC documents and endpoint sets.
The spec’s most reusable conceptual move is the ladder from assumed values to implicit namespace-profile defaults to explicit negotiated values. That gives a clean way to reason about how much trust is being inherited versus actively negotiated.
Ordered arrays are the main control surface. For RPC documents, earlier items have priority and later items may only extend them; for endpoints, ordering expresses namespace-specific preference or fallback.
The CAIP-25 examples are analytically valuable because they reveal multiple live wallet security postures: trust defaults first, trust caller-supplied extensions first, refuse extensions, or counter-propose only known authorities.
The security section shows where practical power centralizes: wallet policy engines, namespace profiles, endpoint registries, and document publication systems all become trust infrastructure.
The privacy guidance matters because wallets are encouraged not to reveal too much about which custom RPCs they support. That makes capability negotiation part of the anti-fingerprinting surface.
The recommendation to use checksummed or commit-specific URIs when immutability matters suggests a governance question beneath the spec: which publication systems or URI schemes a namespace treats as trustworthy will shape interoperability.
Specific source signals worth retaining
CAIP-211 standard text: best source for the assumed / implicit / explicit distinction, ordering semantics, and the four illustrative CAIP-25 security postures.
CAIP-217: best source for the scope-object fields that CAIP-211 extends with RPC documents and endpoints.
CAIP-25: important context because CAIP-211 only becomes operationally meaningful when those arrays are negotiated, persisted, and later honored in a session handshake.
Why this entry belongs in the corpus
It strengthens the wallet-auth cluster by adding the layer where wallet sessions become routing and authority negotiation rather than just login or signature prompts.
It helps explain how interoperability standards can preserve a neutral-looking JSON shape while still moving power into wallet trust policy, registry maintenance, namespace profiling, and endpoint selection.
The reusable insight is that permission systems often hide their real politics inside defaults, fallback order, and publication authority rather than in the top-line method list alone.