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<p class="MsoNormal">DCP Call Notes 29-Aug-24<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Joseph Heenan<o:p></o:p></p>
<p class="MsoNormal">Kristina Yasuda<o:p></o:p></p>
<p class="MsoNormal">Mike Jones<o:p></o:p></p>
<p class="MsoNormal">Giuseppe De Marco<o:p></o:p></p>
<p class="MsoNormal">George Fletcher<o:p></o:p></p>
<p class="MsoNormal">Steve Venema<o:p></o:p></p>
<p class="MsoNormal">Jin Wen<o:p></o:p></p>
<p class="MsoNormal">Brian Campbell<o:p></o:p></p>
<p class="MsoNormal">Paul Bastian<o:p></o:p></p>
<p class="MsoNormal">Christian Bormann<o:p></o:p></p>
<p class="MsoNormal">Daniel Fett<o:p></o:p></p>
<p class="MsoNormal">Jan Vereecken<o:p></o:p></p>
<p class="MsoNormal">David Chadwick<o:p></o:p></p>
<p class="MsoNormal">Ben Piercey<o:p></o:p></p>
<p class="MsoNormal">Martin Auer<o:p></o:p></p>
<p class="MsoNormal">Andreea Prian<o:p></o:p></p>
<p class="MsoNormal">Rajvardhan Deshmukh<o:p></o:p></p>
<p class="MsoNormal">Judith Kahrer<o:p></o:p></p>
<p class="MsoNormal">Bjorn Hjelm<o:p></o:p></p>
<p class="MsoNormal">Oliver Terbu<o:p></o:p></p>
<p class="MsoNormal">Hicham Lozi<o:p></o:p></p>
<p class="MsoNormal">Nemanja Patronogic<o:p></o:p></p>
<p class="MsoNormal">Martijn Haring<o:p></o:p></p>
<p class="MsoNormal">Torsten Lodderstedt<o:p></o:p></p>
<p class="MsoNormal">Sebastien Bahloul<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Giuseppe presented about the Federation Wallet Architecture draft<o:p></o:p></p>
<p class="MsoNormal"> <a href="https://peppelinux.github.io/federation-wallet/main.html">
https://peppelinux.github.io/federation-wallet/main.html</a><o:p></o:p></p>
<p class="MsoNormal"> Call for adoption in progress in OpenID Connect working group<o:p></o:p></p>
<p class="MsoNormal"> Defines Entity Types for wallet entities<o:p></o:p></p>
<p class="MsoNormal"> Credential Issuer, Wallet, Credential Verifier<o:p></o:p></p>
<p class="MsoNormal"> Depends on OpenID Federation, OpenID4VP, OpenID4VCI<o:p></o:p></p>
<p class="MsoNormal"> Four Party Model (Three from OpenID4VC + Trusted Third Party)<o:p></o:p></p>
<p class="MsoNormal"> Described possible work to do with DCP working group<o:p></o:p></p>
<p class="MsoNormal"> Define jwks (JWK Set) metadata parameter<o:p></o:p></p>
<p class="MsoNormal"> Define request_uris, response_uris_supported parameters<o:p></o:p></p>
<p class="MsoNormal"> Joseph had commented on endpoint randomization using fragments<o:p></o:p></p>
<p class="MsoNormal"> Constrain Verifiers from over-asking<o:p></o:p></p>
<p class="MsoNormal"> presentation_definitions_supported to start discussion<o:p></o:p></p>
<p class="MsoNormal"> Define OpenID Wallet Provider role<o:p></o:p></p>
<p class="MsoNormal"> Issues attestations about Wallet instances<o:p></o:p></p>
<p class="MsoNormal"> Giuseppe reminded the WG of the issue to incorporate Federation support in HAIP<o:p></o:p></p>
<p class="MsoNormal"> <a href="https://github.com/openid/oid4vc-haip-sd-jwt-vc/issues/88">
https://github.com/openid/oid4vc-haip-sd-jwt-vc/issues/88</a><o:p></o:p></p>
<p class="MsoNormal"> Torsten asked about the Token Endpoint being used to issue wallet instance attestations<o:p></o:p></p>
<p class="MsoNormal"> Giuseppe agreed that it's up to the working group<o:p></o:p></p>
<p class="MsoNormal"> Torsten wants more implementation experience<o:p></o:p></p>
<p class="MsoNormal"> Torsten wants us to keep differentiation between a reference design and specification we write to ensure interoperability<o:p></o:p></p>
<p class="MsoNormal"> The interface between the wallet provider and wallet instance is internal<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Oliver presented about the PR to address client_id_scheme problems<o:p></o:p></p>
<p class="MsoNormal"> <a href="https://github.com/openid/OpenID4VP/pull/237">
https://github.com/openid/OpenID4VP/pull/237</a><o:p></o:p></p>
<p class="MsoNormal"> Mike, Brian, and Joseph agreed to review the PR<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Joseph talked about PR to address issue 17 about client_metadata contents<o:p></o:p></p>
<p class="MsoNormal"> <a href="https://github.com/openid/OpenID4VP/pull/233">
https://github.com/openid/OpenID4VP/pull/233</a><o:p></o:p></p>
<p class="MsoNormal"> Oliver pointed out that any jwks in the request must not be used to verify the signature<o:p></o:p></p>
<p class="MsoNormal"> Oliver to supply text<o:p></o:p></p>
<p class="MsoNormal"> Martijn requested clarifications on parameters that MUST NOT be used<o:p></o:p></p>
<p class="MsoNormal"> And where they may and may not be defined<o:p></o:p></p>
<p class="MsoNormal"> We discussed the jwks element<o:p></o:p></p>
<p class="MsoNormal"> Brian suggested that we use the definition from RFC 7591 (OAuth Client Metadata)<o:p></o:p></p>
<p class="MsoNormal"> Brian said that multiple encryption keys could make sense but probably only one signing key<o:p></o:p></p>
<p class="MsoNormal"> Mike will review the language on extensibility<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kristina talked about the transaction data PR<o:p></o:p></p>
<p class="MsoNormal"> <a href="https://github.com/openid/OpenID4VP/pull/197">
https://github.com/openid/OpenID4VP/pull/197</a><o:p></o:p></p>
<p class="MsoNormal"> Paul said that a cleaner separation would be a different credential format only used for transaction authorization<o:p></o:p></p>
<p class="MsoNormal"> Joseph asked: How does Paul’s suggestion work - do you present a payment credential, then another credential alongside it that is linked to the payment credential and has the transactions details it, or we present the payment
credential type and a transaction data like thing?<o:p></o:p></p>
<p class="MsoNormal"> Paul said that payment providers first validate the person, then issue a payment authorization token<o:p></o:p></p>
<p class="MsoNormal"> The token is only shared between the issuer and the recipient<o:p></o:p></p>
<p class="MsoNormal"> Torsten said that we could create a new response type and credential format<o:p></o:p></p>
<p class="MsoNormal"> That would be really clean<o:p></o:p></p>
<p class="MsoNormal"> What we have isn't as clean but Torsten is in favor of it<o:p></o:p></p>
<p class="MsoNormal"> Christian wants to clarify how to convey that the credential can be used for transaction authorization<o:p></o:p></p>
<p class="MsoNormal"> Daniel agreed with that<o:p></o:p></p>
<p class="MsoNormal"> Torsten discussed clarifications about what can be signed and what can be used for payment authorization<o:p></o:p></p>
<p class="MsoNormal"> There was a lot of discussion about credential formats, including who can decide what formats to use and how they can be used<o:p></o:p></p>
<p class="MsoNormal"> There was a discussion of a two-party versus three-party model<o:p></o:p></p>
<p class="MsoNormal"> The issuer and verifier could be the same party<o:p></o:p></p>
<p class="MsoNormal"> There was a discussion of how to include transaction data in the response in the issue<o:p></o:p></p>
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