blockdiag {
    IdP -> Assertion;
    Assertion -> JsonAssertion  [folded];
        
    group {
    #orientation = portrait
    JsonAssertion -> IdPMapper;
    IdPMapper -> JsonMapped;
    }

    JsonMapped -> Local [folded];

    IdP [numbered = 1]
    Assertion [numbered = 2]
    JsonAssertion [numbered = 3.1]
    IdPMapper  [numbered = 3.2]
    JsonMapped [numbered = 3.3]
    Local [numbered = 4]
}