End-User           dCDN                 uCDN                 CSP
     |                    |                    |                    |
     |               1.CDNI FCI used to        |                    |
     |        advertise URI Signing capability |                    |
     |                    |------------------->|                    |
     |                    |                    |                    |
     |              2.Provides information to verify Signed JWT     |
     |                    |                    |<-------------------|
     |                    |                    |                    |
     |        3.CDNI Metadata interface used to|                    |
     |           provide URI Signing attributes|                    |
     |                    |<-------------------|                    |
     :                    :                    :                    :
     :   (Later in time)  :                    :                    :
     |4.Authorization request                  |                    |
     |------------------------------------------------------------->|
     |                    |                    |  [Apply distribution
     |                    |                    |   policy]          |
     |                    |                    |                    |
     |                    |             (ALT: Authorization decision)
     |5.Request is denied |                    |      <Negative>    |
     |<-------------------------------------------------------------|
     |                    |                    |                    |
     |6.CSP provides Signed URI                |      <Positive>    |
     |<-------------------------------------------------------------|
     |                    |                    |                    |
     |7.Content request   |                    |                    |
     |---------------------------------------->| [Verify URI        |
     |                    |                    |  signature]        |
     |                    |                    |                    |
     |                    |    (ALT: Verification result)           |
     |8.Request is denied |          <Negative>|                    |
     |<----------------------------------------|                    |
     |                    |                    |                    |
     |9.Re-sign URI and redirect to  <Positive>|                    |
     |  dCDN (newly Signed URI)                |                    |
     |<----------------------------------------|                    |
     |                    |                    |                    |
     |10.Content request  |                    |                    |
     |------------------->| [Verify URI        |                    |
     |                    |  signature]        |                    |
     |                    |                    |                    |
     |    (ALT: Verification result)           |                    |
     |11.Request is denied| <Negative>         |                    |
     |<-------------------|                    |                    |
     |                    |                    |                    |
     |12.Content delivery | <Positive>         |                    |
     |<-------------------|                    |                    |
     :                    :                    :                    :
     :   (Later in time)  :                    :                    :
     |13.CDNI Logging interface to include URI Signing information  |
     |                    |------------------->|                    |