ISO/DIS 24165-2

Digital token identifier (DTI) -- Registration, assignment and structure

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DRAFT INTERNATIONAL STANDARD
ISO/DIS 24165-2
ISO/TC 68/SC 8 Secretariat: SNV
Voting begins on: Voting terminates on:
2021-02-05 2021-04-30
Digital token identifier (DTI) — Registration, assignment
and structure —
Part 2:
Data elements for registration
ICS: 03.060
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
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WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 24165-2:2021(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION. ISO 2021
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ISO/DIS 24165-2:2021(E)
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© ISO 2021

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ii © ISO 2021 – All rights reserved
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ISO/DIS 24165-2:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Constituents of a registry record ......................................................................................................................................................... 6

4.1 General ........................................................................................................................................................................................................... 6

4.2 Classes of information ...................................................................................................................................................................... 6

5 Data elements .......................................................................................................................................................................................................... 7

5.1 Categories of data elements ......................................................................................................................................................... 7

5.2 Data elements for base records ................................................................................................................................................ 7

5.3 Normative data elements for base records ..................................................................................................................... 7

5.4 Informative data elements ............................................................................................................................................................ 9

5.5 Data elements for fork record(s) ..........................................................................................................................................10

5.6 Normative data elements for fork record(s) ..............................................................................................................10

6 R egistration authority .................................................................................................................................................................................10

6.1 Name and contact details of the RA ...................................................................................................................................10

6.2 Service pr ovision for the RA .....................................................................................................................................................11

Annex A (normative) Data Requirements ....................................................................................................................................................12

Bibliography .............................................................................................................................................................................................................................16

© ISO 2021 – All rights reserved iii
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ISO/DIS 24165-2:2021(E)
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

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

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).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

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 68, Financial services, Subcommittee SC 8,

Reference data for financial services.
A list of all parts in the ISO 24165 series can be found on the ISO website.

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 2021 – All rights reserved
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ISO/DIS 24165-2:2021(E)
Introduction

With the rise in popularity of peer-to-peer payment systems relying less on centralized authorities,

and instead on aspects of cryptography, decentralized processing, and a distributed network for the

maintenance of a shared record of transaction activity, the need to identify the digital tokens issued,

traded, transacted or stored on these networks has grown. Stakeholders in the trading community,

service providers, custodians, and regulatory bodies have identified numerous use cases where a

standard identifier for accounting, research, tracking, and management of these digital tokens would

improve efficiency and eliminate confusion in the marketplace.

However, the nature of these new types of digital asset means they do not fit within the structure of

existing ISO identifiers in part because they lack clear reference to an issuing authority and might not

be considered the liability of an issuing authority or corporate governing body. These digital assets, in

many cases, cross geographic and monetary governance jurisdictions.

Though these digital assets are sometimes referred to as cryptocurrencies, virtual currencies or

digital currencies, the term ‘currency’ has a specific meaning as defined by ISO 4217. This definition

is in conflict with the nature of the digital tokens identified within this document due to the reasons

described above; namely, the lack of monetary authority and geographic location.

Where traditional financial instruments or currencies are tokenized for electronic exchange, and issued

by a legal entity or a monetary authority responsible for it, other International Standards, such as

ISO 6166 or ISO 4217 may apply. To eliminate confusion for users of this document, care has been taken

to provide a clear definition and eligibility criteria for assignment of a Digital Token Identifier (DTI).

This document is addressed to applicants seeking to identify digital tokens conforming to the definition

provided in ISO 24165-1. The data elements described in this document are used to distinguish one set

of digital tokens from another; and are, wherever possible, objective, and publicly available. Inclusion

in the registry and the issuance of an identifier signifies only the existence of the token and its 1:1

relationship to its identifier.
ISO 24165 is organized into the following parts.
— ISO 24165-1 describes the method of registration and assignment of a DTI

— ISO 24165-2 describes the data elements required for registration and display on the DTI registry

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DRAFT INTERNATIONAL STANDARD ISO/DIS 24165-2:2021(E)
Digital token identifier (DTI) — Registration, assignment
and structure —
Part 2:
Data elements for registration
1 Scope

This document defines the data elements included in the registry record and used to establish the 1:1

relationship between a digital token and the identifier assigned according to the method in ISO 24165-1.

2 Normative references

The following document is referred to in the text in such a way that some or all of its 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.

ISO 24165-1, Digital token identifier—Registration, assignment and structure—Part 1: Method for

registration and assignment
3 Terms and definitions

For the purposes of this document, both the terms and definitions below and those given in

ISO 24165-1 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/
3.1
asset
anything that has value to a stakeholder
[SOURCE: ISO/TS 19299:2015, 3.3]
3.2
auxiliary digital token

non-native digital token created as an application on an existing blockchain (3.7) or other distributed

ledger technology for its issuance, storage, or transaction record.

Note 1 to entry: A distributed ledger may support zero or more auxiliary digital tokens.

3.3
auxiliary digital token distributed ledger

assigned DTI of a distributed ledger without a native digital token; or assigned DTI of a distributed

ledger with a native digital token when the distributed ledger is used as the platform for one or more

auxiliary digital tokens [3.2].

EXAMPLE If registering an ERC-20 token operating on the Ethereum blockchain, this data element will

contain the DTI assigned to Ether because Ether is the native digital token on a distributed ledger platform that

supports one or more auxiliary digital tokens.
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ISO/DIS 24165-2:2021(E)

Note 1 to entry: This indicates the DTI of either the type = 1 or type = 2 digital token identifier type used by the

auxiliary digital token (See clause 5.3).
3.4
auxiliary digital token mechanism
protocol used to create an auxiliary digital token
EXAMPLE ERC-20 (used for Ethereum) and Omni Layer (used for Bitcoin.)
3.5
auxiliary digital token technical reference

element, such as a smart contract address, used to uniquely identify an auxiliary digital token’s (3.2)

origin on a distributed ledger technology platform

Note 1 to entry: For each auxiliary digital token mechanism (3.4), refer to the specifications of the element

including the syntax for that element, in the RA website (https:// www .iso .org/ maintenance _agencies .html).

For example, for an auxiliary token mechanism ERC-20, the auxiliary token technical reference would likely be a

smart contract address with a designated syntax.
3.6
block
data structure comprising a block header (3.11) and block data (3.8)
[SOURCE: ISO 22739:2020, 3.2]

Note 1 to entry: For the purposes of this standard, the division of data elements in a block between block header

(3.11) and block data (3.8) is illustrative. Other methods of organizing the data elements typically contained in

block header (3.11) and block data (3.8) may be utilized.
3.7
blockchain

distributed ledger (3.23) with confirmed blocks (3.6) organized in an append-only, sequential chain

using cryptographic links.

Note 1 to entry: blockchains are designed to be tamper resistant and to create final, definitive and immutable

ledger records.
[SOURCE: ISO 22739:2020, 3.6]
3.8
block data

data structure comprising zero or more transaction records or references to transaction records

[SOURCE: ISO 22739:2020, 3.3]
3.9
block hash

cryptographic hash value of the information contained in a block in a blockchain [3.7] as specified by

the consensus mechanism (3.14)
3.10
block hash algorithm

cryptographic hash function, specified by the consensus mechanism (3.14) of a blockchain, used to

produce the block hash (3.9)
EXAMPLE a double SHA-256 hash (a SHA-256 hash of a SHA-256 hash)
3.11
block header
data structure that includes a cryptographic link to the previous block (3.6)

Note 1 to entry: A block header can also contain a timestamp (3.44)], a nonce, and other DLT (3.24) platform

specific data, including a hash value of corresponding transaction records.
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ISO/DIS 24165-2:2021(E)
[SOURCE: ISO 22739:2020, 3.4]
3.12
block height
number of blocks preceding a given block in a blockchain
EXAMPLE a genesis block [3.36] has block height = 0
3.13
consensus

agreement among DLT (3.24) nodes that 1) a transaction is validated and 2) that the distributed ledger

(3.23) contains a consistent set and ordering of validated transactions
Note 1 to entry: Consensus does not necessarily mean that all DLT nodes agree.

Note 2 to entry: The details regarding consensus differ between blockchain designs and this is one key

distinguishing characteristic between one design and another.
[SOURCE: ISO 22739:2020, 3.11]
3.14
consensus mechanism
rules and procedures by which consensus (3.13) is reached
[SOURCE: ISO 22739:2020, 3.12]

Note 1 to entry: This definition is not limited to high level categories of consensus mechanisms, such as proof-

of-work or proof-of-stake, but also includes all specific rules for validating transactions and achieving consensus

([3.13]. E.g. Bitcoin Cash and Bitcoin are both blockchains (3.7) utilizing proof-of-work, but they have different

consensus mechanisms; Bitcoin Cash increased the maximum block size relative to Bitcoin, which was a change

in the consensus mechanism that caused the 2017 fork [x.x] that resulted in the creation of Bitcoin Cash.

3.15
consensus mechanism change response

binary choice denoting, if true, that the consensus mechanism (3.14) used to validate the block (3.6) at

the fork block height (3.31) identified in the fork record differ from the consensus mechanism (3.14) used

to validate the block immediately prior to the block at the fork block height (3.31) identified in the fork

record (see clause 4.1 and 5.3)
3.16
digital token external identifiers type
enumerated list of external identifier [3.26] types for the digital token
3.17
digital token external identifiers value
list of other external identifiers (3.26) for the digital token
3.18
digital token identifier type

categorization of the digital token identifier within the registry (see clause 5.3)

3.19
digital token long name

string containing the full name of the digital token, as represented in alphanumeric basic Latin

characters
3.20
digital token reference implementation URL

Uniform Resource Locator (URL) pointing to the digital token’s reference implementation or software

repository

Note 1 to entry: The supported set of protocols shall be provided in the RA website https:// www .iso .org/

maintenance _agencies .html.
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ISO/DIS 24165-2:2021(E)
3.21
digital token short name(s)

list of one or more short names or ticker symbols used to represent this digital token, as represented in

alphanumeric basic Latin characters
3.22
digital token unit multiplier

multiplier used to map from the unit of value stored on the distributed ledger to the unit of value

associated with the digital token long name (3.19)
EXAMPLE Bitcoin has a digital token unit multiplier of 100,000,000.
3.23
distributed ledger

ledger that is shared across a set of DLT (3.24) nodes and synchronized between the DLT (3.24) nodes

using a consensus mechanism (3.14)

Note 1 to entry: a distributed ledger is designed to be tamper resistant, append-only and immutable containing

confirmed and validated transactions.
[SOURCE: ISO 22739:2020, 3.22]
3.24
distributed ledger technology
DLT
technology that enables the operation and use of distributed ledgers (3.23)
[SOURCE: ISO/IEC 18014-1:2008, 3.23]
3.25
distributed ledger technology type

category of systems implementing distributed ledger technology (3.24) based on their consensus

mechanisms [3.14].

Note 1 to entry: the applicability of the data elements in base records and fork (3.27) records is dependent on the

combination of digital token identifier type (3.18) and distributed ledger technology type, see clause 5.3

3.26
external identifier

identifier, external to this standard, that may be used to identify either the digital token or the

underlying asset that this digital token represents
EXAMPLE [ISO 6166]
3.27
fork

creation of two or more different versions of a distributed ledger (3.23) originating from a common

starting point with a single history
[SOURCE: ISO 22739:2020, 3.37]

Note 1 to entry: A fork may or may not result in the creation of a new digital token.

Note 2 to entry: Terms such as hard fork and soft fork are sometimes used to distinguish backwards compatibility

changes to the consensus mechanism (3.14) of a blockchain. This standard uses the term fork to encompass both

scenarios.
3.28
fork block

block having a block height (3.12) equal to the fork block height (3.31) data element specified in a

fork record
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