kSIST-TP FprISO/TR 23244:2021
(Main)Blockchain and distributed ledger technologies - Privacy and personally identifiable information protection considerations (ISO/TR 23244:2020)
Blockchain and distributed ledger technologies - Privacy and personally identifiable information protection considerations (ISO/TR 23244:2020)
This document provides an overview of privacy and personally identifiable information (PII) protection as applied to blockchain and distributed ledger technologies (DLT) systems.
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Tehnologije veriženja blokov in porazdeljene glavne knjige - Vrste zaščite osebnih podatkov ali informacij, ki omogočajo prepoznavanje oseb (ISO/TR 23244:2020)
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TECHNICAL ISO/TR
REPORT 23244
First edition
2020-05
Blockchain and distributed ledger
technologies — Privacy and personally
identifiable information protection
considerations
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 1
5 Privacy framework for blockchain/DLT systems . 2
5.1 Overview . 2
5.1.1 General. 2
5.1.2 Actors and roles . 3
5.1.3 PII principals . 3
5.1.4 PII controller . 3
5.1.5 PII processor . 3
5.2 Interactions . 3
5.3 Recognizing PII . 3
5.3.1 General. 3
5.4 Privacy safeguarding requirements . 4
5.4.1 General. 4
5.4.2 Legal and regulatory factors . 4
5.4.3 Storage of PII on blockchain and DLT systems . 5
5.4.4 Contractual factors . 5
5.4.5 Business Factors . 6
5.5 Privacy policies . 6
5.6 Privacy controls . 7
5.6.1 General. 7
5.6.2 On-chain and off-chain PII data storage and privacy considerations . . 8
5.6.3 Privacy enhancing technologies applicable to blockchain and DLT Systems . 9
5.7 Privacy and identity management .13
6 Privacy impact assessment .13
6.1 General .13
6.2 Privacy impact assessment as part of the overall risk management program .13
6.3 Privacy threats.13
6.4 Privacy vulnerabilities .13
6.5 Privacy consequences .14
6.6 Privacy risk mitigation strategies .14
7 Privacy management in blockchain and DLT .14
7.1 General .14
7.2 Personal information management systems .14
7.3 Change management .14
7.4 Monitoring, review and continuous improvement .15
7.5 PII principal awareness .15
7.6 Privacy-related complaint handling .15
7.7 Decommissioning .16
7.8 Regulatory and compliance aspects .16
Bibliography .17
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
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expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 307, Blockchain and distributed ledger
technologies, in collaboration with Joint Technical Committee ISO/IEC JTC 1, Information security,
Subcommittee SC 27, cybersecurity and privacy protection.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
Introduction
This document provides an overview of the issues and practical concerns related to privacy and
personally identifiable information (PII) protection in the context of blockchain and distributed ledger
technologies (DLT) and their applications.
Privacy and PII protection issues are widely considered as a major barrier for the adoption of DLT-based
solutions. This document identifies and assesses known privacy-related risks and the way to mitigate
them, as well as the privacy-enhancing potential of blockchain and distributed ledger technology.
TECHNICAL REPORT ISO/TR 23244:2020(E)
Blockchain and distributed ledger technologies — Privacy
and personally identifiable information protection
considerations
1 Scope
This document provides an overview of privacy and personally identifiable information (PII) protection
as applied to blockchain and distributed ledger technologies (DLT) systems.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
1)
ISO 22739 , Blockchain and distributed ledger technologies — Terminology
ISO/IEC 27000, Information technology — Security techniques — Information security management
systems — Overview and vocabulary
ISO/IEC 29100, Information technology — Security technique — Privacy framework is referred to in the
text in order to provide terms and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 22739, ISO/IEC 27000 and
ISO/IEC 29100 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Abbreviated terms
The following abbreviations are used in this document:
DLT distributed ledger technology
EU European Union
ICT information and communication technology
IoT internet of things
PET privacy enhancing technology
PII personally identifiable information
ZKSNARK zero-knowledge succinct non-interactive argument of knowledge
1) Under preparation. Stage at the time of publication: ISO/FDIS 22739:2020.
5 Privacy framework for blockchain/DLT systems
5.1 Overview
5.1.1 General
The following components relate to privacy and the processing of PII in blockchain and DLT systems
and make up the privacy framework described in this document: These components
...
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