I would like to see some time-based permission scheme, for instance the ability to share my credit card information with Amazon for the next five minutes as wel

I would like to see some time-based permission scheme, for instance the ability to share my credit card information with Amazon for the next five minutes as well as the ability to share my address with Amazon for the next year. My hope is that this could eventually be built out to support discrete identities, perhaps one for personal use and another for work and a third that is meant to remain anonymous. A PKI based infrastructure comes to mind, that would provide the ability to revoke access. Technically I don't see a way to force systems to stop using revoked data but maybe the revocations could be used to provide legal proof that a specific company no longer has access to specific data.