In some embodiments {TAIL ~ the reader} may use the ID to help identify the proper signing authority, or may use the ID to help identify which SAPK to use from {HEAD ~ a given signing authority} 
In some embodiments { TAIL ~ the reader } may use the ID to help identify the proper signing authority , or may use the ID to help identify which SAPK to use from { HEAD ~ a given signing authority }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD