Title:
BLOCKCHAIN SYSTEM, APPROVAL TERMINAL, USER TERMINAL, HISTORY MANAGEMENT METHOD, AND HISTORY MANAGEMENT PROGRAM
Document Type and Number:
WIPO Patent Application WO/2020/100602
Kind Code:
A1
Abstract:
The present invention enables a data history to be easily tracked in a blockchain. Provided is a blockchain system comprising a user terminal 1 and an approval terminal 2, wherein: the user terminal 1 includes a transaction issuance unit 13 for issuing a transaction to update the value of a smart contract variable; and the approval terminal 2 includes a block generation unit 153 for generating a block that includes a transaction, updating a variable value, and causing the block and an update block number of the block for which the variable value has been updated to be reflected in a distributed ledger 11 of the terminals of the blockchain system.
Inventors:
WATANABE HIROKI (JP)
ISHIDA TATSURO (JP)
OHASHI SHIGENORI (JP)
FUJIMURA SHIGERU (JP)
NAKADAIRA ATSUSHI (JP)
ISHIDA TATSURO (JP)
OHASHI SHIGENORI (JP)
FUJIMURA SHIGERU (JP)
NAKADAIRA ATSUSHI (JP)
Application Number:
PCT/JP2019/042658
Publication Date:
May 22, 2020
Filing Date:
October 30, 2019
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G06F16/17; G06F16/182
Foreign References:
| JPS6362805B2 | 1988-12-05 |
Other References:
SATO, SEI, NEW IOT TECHNOLOGY, BLOCKCHAINS, OF COURSE, vol. 44, no. 8, 1 August 2018 (2018-08-01), pages 29 - 39
FENG, YAOKAI ET AL.: "Next-Generation Cryptocurrency Platform Ethereum and Its Evaluation, non-official translation (CSS 2015 Computer Security Symposium, 2015, 2015 proceedings and anti-malware research human resources development workshop, 2015 privacy workshop", 2015 IPSJ SYMPOSIUM SERIES, vol. 2015, 14 October 2015 (2015-10-14), pages 1151 - 1158
FENG, YAOKAI ET AL.: "Next-Generation Cryptocurrency Platform Ethereum and Its Evaluation, non-official translation (CSS 2015 Computer Security Symposium, 2015, 2015 proceedings and anti-malware research human resources development workshop, 2015 privacy workshop", 2015 IPSJ SYMPOSIUM SERIES, vol. 2015, 14 October 2015 (2015-10-14), pages 1151 - 1158
Attorney, Agent or Firm:
MIYOSHI Hidekazu et al. (JP)
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