(19)
(11) EP 4 433 931 A2

(12)

(88) Date of publication A3:
29.06.2023

(43) Date of publication:
25.09.2024 Bulletin 2024/39

(21) Application number: 22840363.0

(22) Date of filing: 10.11.2022
(51) International Patent Classification (IPC): 
G06F 21/64(2013.01)
H04L 9/00(2022.01)
 H04L 9/32(2006.01)
(52) Cooperative Patent Classification (CPC):
G06F 21/64; G06F 2221/2151; H04L 9/3297; H04L 9/50; H04L 9/0872
(86) International application number:
PCT/US2022/049498
(87) International publication number:
WO 2023/086444 (19.05.2023 Gazette 2023/20)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA
Designated Validation States:
KH MA MD TN

(30) Priority: 15.11.2021 US 202117526161

(71) Applicant: 707 Limited
Hong Kong (HK)

(72) Inventors:
  • YANG, Wei Hsiung Nicolas
    Central Hong Kong (HK)
  • KONG, Johnson Zone An
    Central Hong Kong (HK)
  • LIN, Michael Ming-Jae
    Central Hong Kong (HK)

(74) Representative: Marks & Clerk LLP 
15 Fetter Lane
London EC4A 1BW
London EC4A 1BW (GB)

   


(54) COMPUTER-IMPLEMENTED METHODS FOR EVIDENCING THE EXISTENCE OF A DIGITAL DOCUMENT, ANONYMOUSLY EVIDENCING THE EXISTENCE OF A DIGITAL DOCUMENT, AND VERIFYING THE DATA INTEGRITY OF A DIGITAL DOCUMENT