Identifier change management apparatus, identifier change management method, and identifier change management program

An identifier change management method performed by an identifier change management apparatus connectable to a distributed ledger network, the identifier change management method comprising:

• registering in a distributed ledger an identifier change program holding a public key and a first hash value used in an identifier change;
• managing the distributed ledger;
• receiving a secret key used in the identifier change;
• holding a seed value of a hash value used in the identifier change;
• issuing an identifier change transaction including a signature value of an electronic signature that has been performed using the secret key and a second hash value generated using the seed value;
• and
• changing the identifier when receiving the identifier change transaction, by the identifier change program, on condition that the signature value included in the identifier change transaction is verifiable by using the public key and a value obtained by applying a hash function to the second hash value becomes the first hash value.

A non-transitory computer readable storage medium storing a computer program which is executed by an identifier change management apparatus connectable to a distributed ledger network to provide the steps of:

• registering in a distributed ledger an identifier change program holding a public key and a first hash value used in an identifier change;
• managing the distributed ledger;
• receiving a secret key used in the identifier change;
• holding a seed value of a hash value used in the identifier change;
• issuing an identifier change transaction including a signature value of an electronic signature that has been performed using the secret key and a second hash value generated using the seed value;
• and
• changing the identifier when receiving the identifier change transaction, by the identifier change program, on condition that the signature value included in the identifier change transaction is verifiable by using the public key and a value obtained by applying a hash function to the second hash value becomes the first hash value.