Consider replacing the context IRI with an object

[OR13]

JSON-LD processors will attempt to resolve the context.

"https://w3id.org/rebase/v1"

If we instead require that the context for all credentials looks like this:

 "@context":[
        "https://www.w3.org/2018/credentials/v1",
        { "@vocab": "https://w3id.org/rebase#"}
    ],

Those processors will not error on a cache miss, and will never "accidentally" go download the context from the internet.

This would not be required if "https://www.w3.org/2018/credentials/v1" included an @vocab.

See the related thread:

w3c/vc-data-model#753