<PackageReference Include="Newtonsoft.Json" Version="11.0.2" />

Newtonsoft.Json.Bson.BsonObjectId

public class BsonObjectId
Represents a BSON Oid (object id).
namespace Newtonsoft.Json.Bson { public class BsonObjectId { public byte[] Value { get; } public BsonObjectId(byte[] value); } }