The spec is based on the SIOP specification that is part of the OIDC core specification. The last (deprecated) working draft can be found here: https://identity.foundation/did-siop
❗ This specification is DEPRECATED--DO NOT use this in production. ❗
❗ The current version of DID SIOP is v0.1 and is an unapproved WG draft and now deprecated. The work on DIF SIOP DID Profile specification has moved to OIDF AB WG to work on a number of specifications: ❗