In the Verifiable Claims (and other) groups, the concern about things such as JSON-LD contexts changing meaning over time came up. On thought would be to create a convention, or rely upon some other standard, to allow URIs to be "content addressable", in the sense that it can be determined that the content derived from dereferencing a remote resource can be determined to be the same content as was originally intended.

There's also a desire to be able to pre-load contexts, without requiring that they be downloaded when accessed, which could be addressed using such a mechanism.

There are also some proposed RFCs that attempt to address this problem (thanks to @mesinter):

• 'duri' URI takes the form:

    duri:<timestamp>:<embeddedURI>
  

• 'tdb' URI takes a similar form:

    tdb:<timestamp>:<embeddedURI>
  

See w3c-ccg/did-spec#32