RE: Cross border identity use case - which did methods?

Perhaps the ideas behind Polymorphic Encryption and Pseudonymisation<https://www.semanticscholar.org/paper/Polymorphic-Encryption-and-Pseudonymisation-for-Verheul-Jacobs/a5ecb2f8a3b57bbfe310edabc01f435238a5c929> may be relevant here. They have some summarizing slides<https://redasci.org/wp-content/uploads/2017/02/pep-informal.pdf>.
Rieks

From: Steve Capell <steve.capell@gmail.com>
Sent: woensdag 9 maart 2022 08:11
To: Joe Andrieu <joe@legreq.com>
Cc: Credentials Community Group <public-credentials@w3.org>
Subject: Re: Cross border identity use case - which did methods?

“If you need correlatable identifiers for particular points in the transaction, put that in a VC (with a unique nonce), put a hash of the VC on chain, and send the VC separately.”


Could you unpack that a bit?


It’s the exporter (did) that needs to prove their identity using a VC issued by a trusted authority (eg a trust anchor such a government) that confirms the DID == public identity. Then the exporter DID issues a trae document such as an invoice


If the exporter DID is ephemeral then the authority issued VC is equally ephemeral because you need a new one for every ephemeral DID.  I’m not sure that the trust anchor will be keen to support that volume of VCs.


Or am I missing something in your flow ?

Steven Capell
Mob: 0410 437854


On 9 Mar 2022, at 1:26 pm, Joe Andrieu <joe@legreq.com<mailto:joe@legreq.com>> wrote:
. If you need correlatable identifiers for particular points in the transaction, put that in a VC (with a unique nonce), put a hash of the VC on chain, and send the VC separately.
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