Patent AU-2019320957-B2 (AU)
Title: Managing trust points in ledger systems
Inventor: GUAN YAYANG
IPC: H04L29/08
Filed: 2019-11-13
Granted: 2021-01-28
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 2020/035091 A3 
20 February 2020 (20.02.2020) W IP0I PCT 
(51) InternationalPatent Classification: (81) Designated States (unless otherwise indicated, for every 
H04L 29/08 (2006.0 1) H04L 9/32 (2006.01) kind of national protection available): AE, AG, AL, AM, 
H04L 29/06 (2006.01) 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, 
(21)InternationalApplicationNumber: DZ, EC, EE, EG, ES, Fl, GB, GD, GE, GH, GM, GT, HN, PCT/CN2019/1l8143 HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, 
(22) International Filing Date: KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, 
13 November 2019 (13.11.2019) 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, 
(25)FilingLanguage: English SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, 
(26) Publication Language: English TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.  
(71) Applicant: ALIPAY (HANGZHOU) INFORMATION (84) Designated States (unless otherwise indicated, for every 
TECHNOLOGY CO., LTD. [CN/CN]; No. 556 Xixi kind ofregionalprotection available): ARIPO (BW, GH, 
Road, 8th Floor, Section B, Suite 801-11, West Lake Dis- GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, 
trict, Hangzhou, Zhejiang 310000 (CN). UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, 
TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, 
(72) Inventors: GUAN, Yayang; No. 556 Xixi Road, 8th Floor, EEESFFR GB, GR, HR, HU, IE, IS, IT, LTLU, LV, 
Section B, Suite 801-11, West Lake District, Hangzhou, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, 
Zhejiang 310000 (CN). YANG, Xinying; No. 556 Xixi TR), OAPI (BF, BJ, CF,CG, CI, CM, GA, GN, GQ, GW, 
Road, 8th Floor, Section B, Suite 801-11, West Lake Dis- RM,ML, MR, NE,SN, TD, TG).  
trict, Hangzhou, Zhejiang 310000 (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).  
(54) Title: MANAGING TRUST POINTS IN LEDGER SYSTEMS 
60- (57) Abstract: Disclosed herein are devices, methods, systems, and appara
tus, including computer programs encoded on computer storage media, for 
Receive a request for establishing a trust point for a specified 601 managing trust points in ledger systems. One of the methods includes ob
transaction in a series of transactions stored in a ledger system taining a request for establishing a trust point for a specified record in a se
62 603 ries of records in aledger system, determining whether the specified record 
Determine whetherthe specited NO End is a candidate trust point that is trustworthy traceable to a preceding trust ansacion is acandidate trust poin' n sc n iaers 
point, if so, determining whether the specified record is a timestamp record 
YES 604 including trust timestamp information from a trust time server, in response 
determine whether the YES to determining the specified record is not a timestamp record, identifying a 
specitiedctransactionis a rcr oh eodAt~ ~hte 
tistamptransaction? 606 timestamp record adjacent to the specified record, determining whether the 
-NO Markthe specified timestamp record is trustworthily traceable to the specified record, and in 
transaction'asthe sftpoint response to determining the timestamp record is trustworthily traceable to 
Identifyan adjacent tirnestarptransaction 608 the specified record, marking the timestamp record to be the trust point in 
the series of records.  
610 
etermine whether the timestamp 
transaction is rustwarthily traCeable 
NO to the specified transaction? 
YES 
612 
Mark the timestamp transaction as the trust point 
614 
Receive a request to verify a transaction 
0 etrmnthttetasaction is verifiedby verifying the 5616 
tra action trusworthy traceable t a nearest trus ont 
without verifying transactions preceding the nearest trust point Fwt,,rFIG. 6
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Published: 
- with international search report (Art. 21(3)) 
- before the expiration of the time limit for amending the 
claims and to be republished in the event of receipt of 
amendments (Rule 48.2(h)) 
- upon request of the applicant, before the expiration of the 
time limit referred to in Article 21(2)(a) 
(88) Date of publication of the international search report: 
30 April 2020 (30.04.2020)