Block in Bundle                ID
+==========================================+====+
|              Primary Block               | B1 |
+------------------------------------------+----+
|                    BIB                   | B2 |
|   OP(bib-integrity, targets = B1, B5, B6)|    |
+------------------------------------------+----+
|                    BCB                   | B3 |
|    OP(bcb-confidentiality, target = B4)  |    |
+------------------------------------------+----+
|       Extension Block (encrypted)        | B4 |
+------------------------------------------+----+
|              Extension Block             | B5 |
+------------------------------------------+----+
|               Payload Block              | B6 |
+------------------------------------------+----+