The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2022
Filed:
Nov. 05, 2019
Tohoku University, Sendai, JP;
Masao Sakai, Sendai, JP;
Junya Iwazaki, Sendai, JP;
Eisuke Koizumi, Sendai, JP;
Shingo Hasegawa, Sendai, JP;
Shuji Isobe, Sendai, JP;
Masayuki Fukumitsu, Ebetsu, JP;
TOHOKU UNIVERSITY, Sendai, JP;
Abstract
An information processing systemcomprising at least one first node, second nodesfor providing a public key change assistance service, and a blockchain, wherein the first nodecomprises a new public key creation unit, a second node group selection unit, an old and new key information request unit, a draft contract preparation unit, a signature request unit, a first signature execution unit, and a registration unit; each second nodecomprises an old and new key information transmission unit, a second signature execution unit, and a draft contract return unit; the draft contract preparation unitrandomly determines the order of new public keys as transmission destinations; and the signature request unitand the first signature execution unitperform signature request and execution, respectively, so that the order of the nodes that sign a draft transaction contract is random.