(19)

(11)

EP 4 406 187 A1

(12)

(43) Date of publication: 31.07.2024 Bulletin 2024/31 (21) Application number: 21819771.3 (22) Date of filing: 23.11.2021

(51) International Patent Classification (IPC):  H04L 9/32(2006.01) H04L 9/00(2022.01) (52) Cooperative Patent Classification (CPC): H04L 9/50; H04L 9/3247; H04L 9/3297; H04L 2209/56 (86) International application number: PCT/EP2021/082668 (87) International publication number: WO 2023/046312 (30.03.2023 Gazette 2023/13)

(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 MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 23.09.2021 US 202163247433 P (71) Applicant: nChain Licensing AG 6300 Zug (CH)	(72) Inventor: ZHANG, Wei London W1W 8AP (GB) (74) Representative: Page White Farrer  Bedford House 21a John Street London WC1N 2BF London WC1N 2BF (GB)