(19)

(11)

EP 3 568 840 A1

(12)

(43) Date of publication: 20.11.2019 Bulletin 2019/47 (21) Application number: 18738540.6 (22) Date of filing: 12.01.2018

(51) International Patent Classification (IPC):  G07C 13/00(2006.01) H04L 9/30(2006.01) G07C 13/02(2006.01) H04L 29/06(2006.01) (86) International application number: PCT/US2018/013479 (87) International publication number: WO 2018/132651 (19.07.2018 Gazette 2018/29)

(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: MA MD TN (30) Priority: 13.01.2017 US 201715405395 (71) Applicant: Chaum, David Sherman Oaks, CA 91403 (US)	(72) Inventor: Chaum, David Sherman Oaks, CA 91403 (US) (74) Representative: Plasseraud IP  66, rue de la Chaussée d'Antin 75440 Paris Cedex 09 75440 Paris Cedex 09 (FR)