Title:
BLOCK CHAIN UPDATE SYSTEM, SERVER DEVICE, CLIENT DEVICE, BLOCK CHAIN UPDATE METHOD, AND PROGRAM
Document Type and Number:
Japanese Patent JP2018197832
Kind Code:
A
Abstract:
To safely and efficiently update a block chain.SOLUTION: A server device 1 divides a search space into a form in which parallel computation can be performed, and converts the search spaces after division into a form in which request computation can be performed. A client device 2 requests transaction from the server device 1. The server device 1 transmits any one of the search spaces after the conversion to the client device 2. The client device 2 computes a unidirectional function by using the search space after the conversion received from the server device 1, and transmits a result of request computation and information necessary for checking the transaction to the server device 1. The server device 1 receives the result of request computation and information necessary for checking the transaction from the client device 2, verifies whether or not a result of computation of the unidirectional function obtained by inversely converting the result of request computation and the information necessary for checking the transaction are correct, and updates a block chain by using a result of computation satisfying a predetermined condition.SELECTED DRAWING: Figure 4
Inventors:
OTSUKA HIROAKI
KIYOMURA YUTARO
SAITO TSUNEKAZU
KIYOMURA YUTARO
SAITO TSUNEKAZU
Application Number:
JP2017103300A
Publication Date:
December 13, 2018
Filing Date:
May 25, 2017
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
G09C1/00
Domestic Patent References:
| JPH0373990A | 1991-03-28 | |||
| JP2014138194A | 2014-07-28 | |||
| JP2017123116A | 2017-07-13 |
Foreign References:
| US20150193350A1 | 2015-07-09 | |||
| CN103927656A | 2014-07-16 |
Other References:
淵田 康之: "ブロックチェーンと金融取引の革新", 野村資本市場クォータリー, vol. 第１９巻第２号（通巻７４号）, JPN6020017917, 1 November 2015 (2015-11-01), pages 11 - 35, ISSN: 0004274182
Attorney, Agent or Firm:
Naoki Nakao
Yukio Nakamura
Yoshimura Munehiro
Yukio Nakamura
Yoshimura Munehiro