C                            RS                   AS
   |                            |                     |
   | ----- POST /token  ----------------------------> |
   |                            |                     |
   | <---------------------------- Access Token ----- |
   |                           + Access Information   |
   | ---- POST /authz-info ---> |                     |
   |   (access_token, N1, ID1)  |                     |
   |                            |                     |
   | <- 2.01 Created (N2, ID2)- |                     |
   |                            |                     |
 /Sec Context             /Sec Context                |
   derivation/              derivation/               |
   |                            |                     |
   | ---- OSCORE Request -----> |                     |
   |                            |                     |
   |                    /proof-of-possession          |
   |                    Sec Context storage/          |
   |                            |                     |
   | <--- OSCORE Response ----- |                     |
   |                            |                     |
/proof-of-possession            |                     |
Sec Context storage/            |                     |
   |                            |                     |
   | ---- OSCORE Request -----> |                     |
   |                            |                     |
   | <--- OSCORE Response ----- |                     |
   |                            |                     |
   |           ...              |                     |