Patent AU-2018347186-B2 (AU)
Title: Recovering encrypted transaction information in blockchain confidential transactions
Inventor: LIU ZHENG
IPC: G06Q20/38
Filed: 2018-11-07
Granted: 2020-09-03
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) 
(19) World Intellectual Property 
(1) Organization11111111111111111111111I1111111111111i1111liiiii 
International Bureau (10) International Publication Number 
(43) International Publication Date W O 2019/072262 A2 
18 April 2019 (18.04.2019) W IPO I PCT 
(51) International Patent Classification: Wal Building, No. 9 Shangdi 3rd Street, Haidian District, 
Not classified Beijing 100085 (CN).  
(21) International Application Number: (81) Designated States (unless otherwise indicated, for every 
PCT/CN2018/114322 kind ofnational protection available): AE, AG, AL, AM, 
(22)InternationalFilingDate: AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, 
(7 November 2018 (07.11.2018) 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, 
(25) Filing Language: English 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, 
(26)PublicationLanguage: English MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, 
(71) Applicant: ALIBABA GROUP HOLDING LIMITED OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, 
[-/CN]; Fourth Floor, One Capital Place, P.O. Box 847, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, 
George Town, Grand Cayman (KY). TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.  
(72) Inventors: LIU, Zheng; Alibaba Group Legal Department (84) Designated States (unless otherwise indicated, for every 
5/F, Building 3, No. 969 West Wen Yi Road, Yuhang Dis- kind of regional protection available): ARIPO (BW, GH, 
trict, Hangzhou, Zhejiang 311121 (CN). LI, Lichun; Al- GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, 
ibaba Group Legal Department 5/F, Building 3, No. 969 UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, 
West Wen Yi Road, Yuhang District, Hangzhou, Zhejiang TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, 
311121 (CN). YIN, Shan; Alibaba Group Legal Depart- EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, 
ment 5/F, Building 3, No. 969 West Wen Yi Road, Yuhang MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, 
District, Hangzhou, Zhejiang 311121 (CN). TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, 
KM, ML, MR, NE, SN, TD, TG).  
(74) Agent: BEIJING BESTIPR INTELLECTUAL PROP
ERTY LAW CORPORATION; Room 409, Tower B, Ka 
(54) Title: RECOVERING ENCRYPTED TRANSACTION INFORMATION IN BLOCKCHAIN CONFIDENTIAL TRANSAC
TIONS 
(57) Abstract: Implementations of the present disclosure include obtaining a 
secret key, by a client node, according to a threshold secret sharing scheme 
- -os agreed to by a number of client nodes; generating one or more commitment 
values of a confidential transaction of the client node by applying a crypto
graphic commitment scheme to transaction data; generating encrypted trans
/302 / 3i0§)Negotiatethekey actioninformationoftheconfidentialtransactionbyencryptingthetransaction 
A data using the secret key; and transmitting, to a consensus node of a blockchain 
1 network, a content of the confidential transaction for execution, wherein the 
content of the confidential transaction includes: the one or more commitment 
s-s values; the encrypted transaction information; and one or more zero-knowl
edge proofs of the transaction data.  
TX content of 
,confidential transaction 
BC BC 
Execute TX; 
4 ~ Update account; 
BC CRecord TX info 
G 312 350 
(1~ 32 'K ~ Blockchain 
network 
o FIG. 3
W O 2019/072262 A211111I|II|I||I|I|I|||11|1||||I|||I||I|I||||I|||||||||||||||||||||||||||| 
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))