An information processing device includes a memory; and a processor coupled to the memory and configured to transmit, to a terminal, a program and a first identifier related to the program, the program being encrypted with a first public key corresponding to a first private key of the terminal, the first identifier being encrypted by using the first public key and a second public key not corresponding to the first private key; and when the terminal receives the first identifier decrypted by the first public key and encrypted by the second public key, register, in a blockchain, transaction information which includes the first identifier decrypted with the second private key corresponding to the second public key.