Location identifier (GNUnet)

LOC on GNUnet is the URI for non-anonymous filesharing.

The key consists of:
 * "fs/loc/"
 * keyhash
 * queryhash
 * size of the file
 * identity of the peer
 * signature
 * expiration time
 * identity of the peer
 * signature
 * expiration time
 * expiration time
 * expiration time