Radio frequency certificates of authenticity and associated scanners are presented. On the optical disk medium, information is recorded along the track groove on a block unit basis. Both relationships are revoked by executing an online protocol between the parties in the relationship after which both remove the corresponding state variable. The refrigerant flowing into the first space passes through the refrigerant through hole to flow into the second space, to thereby promote the convection in the first, second, third and fourth spaces and equalization of temperatures in the rotor disks.