RPRC
A Relying Party Registration Certificate (RPRC) states which attributes a relying party has registered to request from a Wallet Unit, and for what declared purpose. Where a Member State issues them, a wallet can check a request against what the requester registered to ask for, not just who the requester claims to be.
Implementing Regulation (EU) 2025/848 requires every Member State to keep a register of the relying parties established on its territory. Issuing registration certificates is optional: each Member State decides whether to require them. Where it does, a registration certificate provider designated by that Member State issues each registered relying party a signed JWT or CWT, the RPRC (the regulation calls it a wallet-relying party registration certificate), expressing each intended use and the attributes the relying party may request for it.
An RPRC is distinct from a Relying Party Access Certificate (RPAC): the RPAC is an X.509 certificate that authenticates who the relying party is, while the RPRC records what it registered to ask for.
The regulation says wallet users should be able to verify that the requested attributes fall within the registered scope. How a wallet does that is still under discussion in the ARF. The ARF discussion paper on relying party registration proposes that the wallet warns the user and lets them refuse when a request goes beyond the registration, and that an RPRC carries the same service identifier and name as one of the relying party's access certificates.
Where a Member State issues no RPRCs, the relying party's registration can still be looked up in the national register.
Related terms
What is the difference between an RPRC and an RPAC?
An RPAC (Relying Party Access Certificate) is an X.509 certificate that authenticates who the relying party is. An RPRC (Relying Party Registration Certificate) is a signed JWT or CWT that lists what attributes that relying party has registered to request, and why. Where both are issued, a wallet checks them together: the RPAC for identity, the RPRC for entitlement.