provenance/2 matches the site

public static Activity Acquisition_Establishes_Ownership_Right()
{
    var activity = new Activity()
        .WithContext()
        .WithId("https://linked.art/example/provenance/2")
        .WithClassifiedAs(Aat.ProvenanceActivity);

    var painting = new HumanMadeObject().WithLabel("Painting");
    var museum = new Group().WithLabel("Museum");

    activity.Part = [
        new Acquisition
        {
            TransferredTitleOf = [painting],
            TransferredTitleTo = [museum]
        },
        new RightAcquisition
        {
            Establishes = [
                new Right()
                    .WithLabel("Right of Ownership for Painting")
                    .WithClassifiedAs(OwnershipRight)
                    .WithPossessedBy(museum)
                    .WithAppliesTo(painting)
            ]
        }
    ];

    return activity;
}

var activity = new Activity
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/provenance/2",
    ClassifiedAs = [Aat.ProvenanceActivity],
    Part =
    [
        new Acquisition
        {
            TransferredTitleOf =
            [
                new HumanMadeObject
                {
                    Label = "Painting",
                },
            ],
            TransferredTitleTo =
            [
                new Group
                {
                    Label = "Museum",
                },
            ],
        },
        new RightAcquisition
        {
            Establishes =
            [
                new Right
                {
                    Label = "Right of Ownership for Painting",
                    ClassifiedAs = [Aat.Term("300055603", "Ownership Right")],
                    PossessedBy =
                    [
                        new Group
                        {
                            Label = "Museum",
                        },
                    ],
                    AppliesTo =
                    [
                        new HumanMadeObject
                        {
                            Label = "Painting",
                        },
                    ],
                },
            ],
        },
    ],
};

Generated from the object the example builds: every property that is set, as object initialisers, with the vocabulary constants where a term is in the registry. The fluent helpers are a convenience, not a requirement; this form and the one as written produce the same JSON.