Patent AU-2019203861-B2 (AU)
Title: System and method for ending view change protocol
Inventor: YANG DAYI
IPC: H04L69/40
Filed: 2019-03-18
Granted: 2020-07-02
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 2019/101241 A2 
31 May 2019 (31.05.2019) W IPO I PCT 
(51) International Patent Classification: HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, 
Not classified KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, 
(21) International Application Number: MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, 
PCT/CN2019/078487 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, 
(22) International Filing Date: TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.  
18 March 2019 (18.03.2019) (84) Designated States (unless otherwise indicated, for every 
(25) Filing Language: English kind of regional protection available): ARIPO (BW, GH, 
GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, 
(26)PublicationLanguage: English UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, 
(71) Applicant: ALIBABA GROUP HOLDING LIMITED TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, 
[-/CN]; Fourth Floor, One Capital Place, P.O. BOX 847, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, 
George Town, Grand Cayman (KY). MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, 
(72) Inventor: YANG, Dayi; Alibaba Group Legal Department TR), OAPI (BF, BJ, , C , CGCM,GA,GN,GQGW, 
5/F, Building 3, No.969 West Wen Yi Road, Yuhang Dis- RM,ML,MR,NE,SN,TD,TG).  
trict, Hangzhou, Zhejiang 311121 (CN). Published: 
(74) Agent: BEIJING BESTIPR INTELLECTUAL PROP- - upon request of the applicant, before the expiration of the 
ERTY LAW CORPORATION; Room 409, Tower B, Ka time limit referred to in Article 2(2)(a) 
Wah Building, No.9 Shangdi 3rd Street, Haidian District, - without international search report and to be republished 
Beijing 100085 (CN). upon receipt ofthat report (Rule 48.2(g)) 
(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, Fl, GB, GD, GE, GH, GM, GT, HN, 
(54) Title: SYSTEM AND METHOD FOR ENDING VIEW CHANGE PROTOCOL 
1 (57) Abstract: Methods, systems, and apparatus, including com
puter programs encoded on computer storage media, for perform
ing view change. One of the methods is to be implemented on a 
blockchain maintained a number (N) of nodes and performed by 
User A User B a first node of the N nodes that is in a view change protocol. The 
o method includes: obtaining, respectively from at least Q second 
NOff-ockcha nodes of the Nnodes, at least Qfirst messages each comprising (1) 
communication a consistent current view known to the second node indicating a 
primary node designated among the N nodes and (2) a consistent 
Node ANde B current sequence number known to the second node, the current se
quence number associated with a latest transaction or a latest block, 
Nodes in a network system 112 wherein the current sequence number is larger than a first sequence 
number known to the first node; and responsive to obtaining the at 
least Q first messages, ending the view change protocol.  
Nod 
Nd 
-Node 2 
Node i 
FIG.1 
CA