-Specification authors that write algorithms that fetch a resource based on the -`id` of an object inside a [=conforming document=] need to consider whether -that resource's content is vital to the validity of that document. If it is, the -specification MUST produce a validation error unless the resource matches the -expected media type and cryptographic digest. +A [=conforming verifier implementation=] that makes use of a resource based on +the `id` of an object inside a [=conforming document=] with a corresponding +cryptographic digest MUST check the digest against the retrieved resource. If +the digest of the retrieved resource does not match the one provided by the +[=issuer=], the [=conforming verifier implementation=] MUST produce an error.
+Implementers are urged to consult appropriate sources, such as the