Design principle DP1: Use the multiplicity of roles of actors for scaling the identity ecosystem
To take full advantage of SSI, such systems should be designed so that one party can take on each of the three named roles (issuer, holder, verifier) at any time, using the multiplicity of roles of actors for scaling the identity ecosystem. SSI provides means for actors to engage in different roles, which greatly improves scalability in comparison to eIDAS, where roles are strictly tied to entities.
Source paper
This design principle is proposed by Designing a cross-organizational identity management system: Utilizing SSI for the certification of retailer attributes (Tobias Guggenberger, Daniela Kühne, Vincent Schlatt, Nils Urbach, 2023).