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1. WO2021005474 - COMPUTER-IMPLEMENTED SYSTEM AND METHOD FOR FACILITATING TRANSACTIONS ASSOCIATED WITH A BLOCKCHAIN USING A NETWORK IDENTIFIER FOR PARTICIPATING ENTITIES

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INTERNATIONAL SEARCH REPORT (ISR)
Part 1:  1  2  3  4  5  6          Part 2:  A  B  C  D  E 
PATENT COOPERATION TREATY
PCT
INTERNATIONAL SEARCH REPORT
( PCT Article 18 and Rules 43 and 44)
International application No. Applicant's or agent's file reference
PCT/IB2020/056293 P512433WO/KF
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
03 July 2020 11 July 2019
Applicant
NCHAIN HOLDINGS LIMITED
FOR FURTHER ACTION: See Form PCT/ISA/220 as well as, where applicable, item 5 below.
PART 1
PCT/IB2020/056293
This international search report has been prepared by this International Searching Authority and is transmitted to the applicant according to Article 18. A copy is being transmitted to the International Bureau.
It is also accompanied by a copy of each prior art document cited in this report.
1. Basis of the report
a. With regard to the language, the international search was carried out on the basis of:
the international application in the language in which it was filed.
a translation of the international application into                                          which is the language of a translation furnished for the purposes of international search (Rules 12.3(a) and 23.1(b)).
b.
This international search report has been established taking into account the rectification of an obvious mistake authorized by or notified to this Authority under Rule 91 (Rule 43.6bis(a)).
c.
With regard to any nucleotide and/or amino acid sequence disclosed in the international application, the international search was carried out on the basis of a sequence listing:
2. Certain claims were found unsearchable
3. Unity of invention is lacking
This International Searching Authority found multiple inventions in this international application, as follows:
1. claims: 1-8, 19-27, 36-39
Computer implemented methods (and corresponding computing devices, system and computer program storage medium) for implementing at least one transaction associated with a distributed ledger, comprising the verification of a recipient's public key.
2. claims: 9-17, 28-35
Computer implemented methods for implementing at least one transaction associated with a distributed ledger, comprising the verification of the validity of a recipient's network address.
3. claim: 18
Computer implemented method for implementing at least one transaction associated with a distributed ledger, comprising the use of session keys for encrypting data in an unspent transaction output and in a non-spendable output.
1.
As all required additional search fees were timely paid by the applicant, this international search report covers all searchable claims.
2.
As all searchable claims could be searched without effort justifying additional fees, this Authority did not invite payment of additional fees.
3.
As only some of the required additional search fees were timely paid by the applicant, this international search report covers only those claims for which fees were paid, specifically claims Nos.:
4.
No required additional search fees were timely paid by the applicant. Consequently, this international search report is restricted to the invention first mentioned in the claims; it is covered by claims Nos.:
Remark on Protest
The additional search fees were accompanied by the applicant’s protest and, where applicable, the payment of a protest fee.
The additional search fees were accompanied by the applicant’s protest but the applicable protest fee was not paid within the time limit specified in the invitation.
No protest accompanied the payment of additional search fees.
4. Title of the invention
The text is approved as submitted by the applicant.
The text has been established by this Authority to read as follows:
5. Abstract
The text is approved as submitted by the applicant.
The text has been established, according to Rule 38.2, by this Authority as it appears in Box No. IV. The applicant may, within one month from the date of mailing of this international search report, submit comments to this Authority.
6. Drawings
a.
The figure of the drawings to be published with the abstract is Figure No.     1    
as suggested by the applicant.
as selected by this Authority, because the applicant failed to suggest a figure.
as selected by this Authority, because this figure better characterizes the invention.
b.
none of the figures is to be published with the abstract.
PART 2
PCT/IB2020/056293

A. CLASSIFICATION OF SUBJECT MATTER

     H04L 29/06 (2006.01)i; H04L 9/32 (2006.01)i; H04L 29/12 (2006.01)i; G06Q 20/22 (2012.01)n; H04L 9/30 (2006.01)n
According to International Patent Classification (IPC) or to both national classification and IPC

B. FIELDS SEARCHED

Minimum documentation searched (classification system followed by classification symbols):
     H04L; G07G; G06Q
Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched:
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
EPO-Internal, WPI Data

C. DOCUMENTS CONSIDERED TO BE RELEVANT

Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
(1)
X
Andreas M. Antonopoulos, "Mastering Bitcoin - Unlocking Digital Cryptocurrencies", "Mastering bitcoin : [unlocking digital cryptocurrencies]", 20 December 2014 (2014-12-20), Beijing Cambridge Farnham Köln Sebastopol TokyoO'Reilly Media,
XP055306939
ISBN: 9781449374044
1-17,19-39
A
page 1 - page 3
18
page 15
page 70 - page 71
page 89 - page 95
page 111 - page 117
(2)
A
Anonymous, "Developer Guide - Bitcoin", 11 May 2015 (2015-05-11), page 1-48,
Retrieved from the Internet:
URL:https://web.archive.org/web/20150511232019/https://bitcoin.org/en/developer-guide
XP055519712
[retrieved on  2018-10-29]
1-8,19-27,36-39
page 30
(3)
A
GARBA A ET AL, "Analysis of man-in-the-middle of attack on bitcoin address", COMPENDEX2018, Database accession no. E20193507383027
Retrieved from the Internet:
URL:ENGINEERING INFORMATION, INC., NEW YORK, NY, US
XP002800029
1-8,19-27,36-39
sections 1-3 and 5.2
& GARBA A ET AL, "Analysis of man-in-the-middle of attack on bitcoin address",  ICETE 2018 - PROCEEDINGS OF THE 15TH INTERNATIONAL JOINT CONFERENCE ON E-BUSINESS AND TELECOMMUNICATIONS - ICETE 2018 - PROCEEDINGS OF THE 15TH INTERNATIONAL JOINT CONFERENCE ON E-BUSINESS AND TELECOMMUNICATIONS 2018 SCITEPRESS PRT,Vol. 2, 2018, page 388-395,
(4)
A
GIUSEPPE ATENIESE ET AL, "Certified Bitcoins", IACR, INTERNATIONAL ASSOCIATION FOR CRYPTOLOGIC RESEARCH,Vol. 20140204:170250, 03 February 2014 (2014-02-03), page 1-16,
XP061015471
1-8,19-27,36-39
page 1 - page 3
(5)
A
T. Aura, "Cryptographically Generated Addresses (CGA)", 01 October 2003 (2003-10-01),
Retrieved from the Internet:
URL:https://link.springer.com/content/pdf/10.1007/10958513_3.pdf
XP055738755
[retrieved on  2020-10-12]
9-17,28-35
sections 1-5
(6)
A
MICHAL ZIMA, "Sending Money Like Sending E-mails: Cryptoaddresses, The Universal Decentralised Identities", ARXIV.ORG, CORNELL UNIVERSITY LIBRARY, 201 OLIN LIBRARY CORNELL UNIVERSITY ITHACA, NY 14853,15 December 2016 (2016-12-15),
XP080744493
9-17,28-35
the whole document
(7)
A
US 2018343114 A1 (BEN-ARI ADI [GB]) 29 November 2018 (2018-11-29)
18
paragraph [0001]
paragraph [0007] - paragraph [0017]
paragraph [0083] - paragraph [0085]
paragraph [0092] - paragraph [0095]
(8)
A
US 10320843 B1 (DOBREK LUKASZ [US] ET AL) 11 June 2019 (2019-06-11)
18
column 1, line 1 - column 1, line 54
column 6, line 8 - column 7, line 10
*
Special categories of cited documents:
"A"
document defining the general state of the art which is not considered to be of particular relevance
"D"
document cited by the applicant in the international application
"E"
earlier application or patent but published on or after the international filing date
"L"
document which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified)
"O"
document referring to an oral disclosure, use, exhibition or other means
"P"
document published prior to the international filing date but later than the priority date claimed
"T"
later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the invention
"X"
document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone
"Y"
document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the art
"&"
document member of the same patent family

D. INFORMATION ON PATENT FAMILY MEMBERS

Patent document cited in search report Publication date
(day/month/year)		 Patent family member(s) Publication date
(day/month/year)
US 2018343114 A1
29 November 2018
EP 3380984 A1
US 2018343114 A1
WO 2017090041 A1
03 October 2018
29 November 2018
01 June 2017
US 10320843 B1
11 June 2019
US 10320843 B1
US 10728283 B1
11 June 2019
28 July 2020
Name and mailing address of the ISA/:
European Patent Office
P.B. 5818, Patentlaan 2, 2280 HV Rijswijk,
Netherlands
Telephone No. (+31-70)340-2040
Facsimile No. (+31-70)340-3016
Date of the actual completion of the international search:
13 October 2020
Date of mailing of the international search report:
22 October 2020
Authorized officer:
Bakdi, Idir
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