Design principle DP2: Anticipate an ecosystem of various ledgers
Do not assume a single shared ledger; anticipate an ecosystem of various distributed ledgers, since SSI practice and interoperability requirements span multiple ledgers.
Source paper
This design principle is proposed by Designing a Framework for Digital KYC Processes Built on Blockchain-Based Self-Sovereign Identity (Vincent Schlatt, Johannes Sedlmeir, Simon Feulner, Nils Urbach, 2022).