Control method, non-transitory computer-readable storage medium, and information processing apparatus

1. A control method comprising:

generating third key information, when receiving a recording request for asset information to a first blockchain of a plurality of blockchains and first key information from a terminal used by a user, by decrypting by using the first key information and second key information stored in a certain storage area;

generating fourth key information by decrypting first encrypted key information associated with the first blockchain among a plurality of pieces of encrypted key information by using the generated third key information, each of the plurality of pieces of encrypted key information being associated with each of the plurality of blockchains, the plurality of pieces of encrypted key information being generated by encrypting;

performing an authentication on the first blockchain by using the fourth key; and

transmitting the recording request to the first blockchain,

wherein the first key information, the second key information, and a fifth key are generated by sixth key information generated by a random number received from the user, and

the first key information, the second key information, and the fifth key are divided decryption keys that are decrypted when two of the divided decryption keys are aligned.

2. The control method according to claim 1 , wherein the certain storage area is a storage area protected by data encryption.

3. The control method according to claim 2 , wherein the third key information is stored in the certain storage area.

4. The control method according to claim 3 , wherein the fourth key information is stored in the certain storage area.

5. The control method according to claim 4 , further comprising:

deleting the third key information and fourth key information from the certain storage area after the transmitting to the blockchain.

6. A non-transitory computer-readable storage medium storing a program that causes a processor included in an information processing apparatus to execute a process, the process comprising:

generating third key information, when receiving a recording request for asset information to a first blockchain of a plurality of blockchains and first key information from a terminal used by a user, by decrypting by using the first key information and second key information stored in a certain storage area;

generating fourth key information by decrypting first encrypted key information associated with the first blockchain among a plurality of pieces of encrypted key information, by using the generated third key information, each of the plurality of pieces of encrypted key information being associated with each of the plurality of blockchains, the plurality of pieces of encrypted key information being generated by encrypting;

performing an authentication on the first blockchain by using the fourth key; and

transmitting the recording request to the first blockchain,

wherein the first key information, the second key information, and a fifth key are generated by sixth key information generated by a random number received from the user, and

the first key information, the second key information, and the fifth key are divided decryption keys that are decrypted when two of the divided decryption keys are aligned.

7. The non-transitory computer-readable storage medium according to claim 6 , wherein the certain storage area is a storage area protected by data encryption.

8. The non-transitory computer-readable storage medium according to claim 7 , wherein the third key information is stored in the certain storage area.

9. The non-transitory computer-readable storage medium according to claim 8 , wherein the fourth key information is stored in the certain storage area.

10. An information processing apparatus comprising:

a memory; and

a processor coupled to memory and configured to:

generate third key information, when receiving a recording request for asset information to a first blockchain of a plurality of blockchains and first key information from a terminal used by a user, by decrypting by using the first key information and second key information stored in a certain storage area,

generate fourth key information by decrypting first encrypted key information associated with the first blockchain among a plurality of pieces of encrypted key information; by using the generated third key information, each of the plurality of pieces of encrypted key information being associated with each of the plurality of blockchains, the plurality of pieces of encrypted key information being generated by encrypting,

perform an authentication on the first blockchain by using the fourth key, and

transmit the recording request to the first blockchain,

wherein the first key information, the second key information, and a fifth key are generated by sixth key information generated by a random number received from the user, and

the first key information, the second key information, and the fifth key are divided decryption keys that are decrypted when two of the divided decryption keys are aligned.

11. The information processing apparatus according to claim 10 , wherein the certain storage area is a storage area protected by data encryption.

12. The information processing apparatus according to claim 11 , wherein the third key information is stored in the certain storage area.

13. The information processing apparatus according to claim 12 , wherein the fourth key information is stored in the certain storage area.

14. The information processing apparatus according to claim 13 , wherein the processor deletes the third key information and fourth key information from the certain storage area after the transmitting to the blockchain.