SG11201903563WA - Blockchain system supporting public and private transactions under account models - Google Patents

Abstract

WO 19/07 2265 A2 (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 18 April 2019 (18.04.2019) WIPO I PCT 11111111111111011111111111111110111110100111111111110111011111111111111111011110111111 (10) International Publication Number WO 2019/072265 A2 Generating commitment value PC(t) based on hansactun amount !and random numberr 308 Using , date key to digitally sign PC(t), t, and r (51) International Patent Classification: Not classified (21) International Application Number: PCT/CN2018/114401 (22) International Filing Date: 07 November 2018 (07.11.2018) (25) Filing Language: English (26) Publication Language: English (71) Applicant: ALIBABA GROUP HOLDING LIMITED [—/CN]; Fourth Floor, One Capital Place, P.O. Box 847, George Town, Grand Cayman (KY). (72) Inventors: MA, Baoli; Alibaba Group Legal Department 5/ F, Building 3, No.969 West Wen Yi Road, Yuhang District, Hangzhou, Zhejiang 311121 (CN) ZHANG, Wenbin; Al- ibaba Group Legal Department 5/F, Building 3, No.969 West Wen Yi Road, Yuhang District, Hangzhou, Zhejiang 311121 (CN). (74) Agent: BEIJING BESTIPR INTELLECTUAL PROP- ERTY LAW CORPORATION; Room 409, Tower B, Ka Wah Building, No.9 Shangdi 3rd Street, Haidian District, Beijing 100085 (CN). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, 1E, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). (54) Title: BLOCKCHAIN SYSTEM SUPPORTING PUBLIC AND PRIVATE TRANSACTIONS UNDER ACCOUNT MODELS (57) : Implementations of the present disclosure include receiving, 300 by a consensus node of a blockchain, transaction data and a digital signature of the transaction data. The transaction data includes a commitment value, a random number, and a transaction amount to be transferred from one of a er ooe A B'o , Krr Nodo 302 public account or a private account of the first user node to one of a public Us account or a private account of a second user node. The consensus node verifies the digital signature of the transaction data using a public key of 306 the first user node. It then determines that the transaction amount is valid, if the commitment value is correct based on the random number and the commitment scheme, and the transaction amount is less than or equal to a balance of the one of the public account or the private account of the first user node before transfer of the transaction amount. 310 S ending the P Clq, t, r, and digital sTnarre to blockchain network 312 Veting the digit I signature 314 Determining that PC(I) , s correct 316 Update balances of user noat A and user node B FIG. 3 [Continued on next page] WO 2019/072265 x2111111 I 0111110111010111111110n1001110111111 IIIII VIII IIIII IIIIMEMIE Published: upon request of the applicant, before the expiration of the time limit referred to in Article 21(2)(a) without international search report and to be republished upon receipt of that report (Rule 48.2(g))