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Global Standardization Activities

Trends in Standardization of Blockchain Technology by ISO/TC 307

Hideyuki Iwata, Takashi Tominaga,
and Takeshi Morikawa


The second meeting of ISO/TC 307 (International Organization for Standardization Technical Committee 307: blockchain and electronic distributed ledger technologies) was held in Tokyo in November 2017. This TC is working to develop international standards for blockchain technology. This article introduces the concept of blockchain technology—the fundamental technology used for bitcoin—as well as trends in the international standardization of electronic distributed ledger technologies and some applications of blockchain technology beyond cryptocurrency.

Keywords: blockchain, distributed ledger, traceability


1. Introduction

In April 2016, Australia proposed to the International Organization for Standardization (ISO) to set up a technical committee (TC) on standardization of blockchain technology, which was in the spotlight as the fundamental technology of cryptocurrency, as represented by bitcoin. In September 2016, a TC on blockchain and electronic distributed ledger technologies was established (TC 307), and international standardization efforts began in the areas of blockchain and electronic distributed ledger systems and application, interoperability, and data exchange between users. The second meeting* was held in Tokyo in November 2017, following the first meeting held in Sydney in April 2017.

In line with international standardization efforts on blockchain technology, a domestic committee for making proposals to ISO/TC 307 was established, and JIPDEC (Japan Institute for Promotion of Digital Economy and Community) [1] took on the role of secretariat of the committee. Many Japanese organizations and companies involved with blockchain technology participated and began making recommendations. NTT and NTT DATA are the NTT Group companies participating in the domestic committee.

* Participating countries and regions: France, United States of America, Australia, United Kingdom, Germany, Denmark, Malaysia, Russia, Croatia, Japan, Korea, the Netherlands, Ireland, Austria, China, Canada, Finland, Spain, Italy, Indonesia, Luxembourg, Argentina, Iran, Hong Kong, Belgium, New Zealand, South Africa, Israel, Sweden, Norway, Switzerland, Slovakia, Singapore, Thailand, Czech Republic.

2. Standardizing the concept of blockchain

Blockchain technology is often mentioned, but it is not easy to explain it clearly in a short and simple phrase. The reason for this is that it simply is an unconventional concept. It is most commonly explained as a noncentralized ledger in a network system. The Ministry of Economy, Trade and Industry and the Financial Services Agency of Japan use the expression distributed electronic ledger to explain blockchain technology.

A blockchain collects a certain amount of data as a block and has a data structure connected like a chain (Fig. 1). The context of blocks forming the chain is defined using cryptographic technology. A blockchain is equivalent to a data store that takes the role of a ledger in a network system consisting of several nodes. There are many different ways for a data store to take on the role of a ledger in a network system, but the blockchain has a unique feature in terms of structure. It may be imagined that each node in a network possesses part of the ledger, and the nodes together form a ledger as an entire system (hence the idea of a distributed ledger).

Fig. 1. Concept of blockchain.

In fact, though, the parts of the blockchain (ledger) that each node possesses are all the same, and thus, each node possesses a complete ledger where all transactions are recorded. The word distributed is used because even though there are no nodes with a centralized role in the network, the network that uses a blockchain is designed to autonomously maintain the blockchain. The point is, what is distributed is not data, but authority. Moreover, the mechanism for forming and maintaining the blockchain is typically called blockchain technology [2]. The international standardization efforts for blockchain technology in ISO/TC307 are being carried out in order to standardize the blockchain concept and the mechanism to support it.

3. Blockchain technology spread by standardization

A representative theme of blockchain is its use in cryptocurrency. A mechanism applying bitcoin and altocoin is being studied. Meanwhile, other uses of blockchain technology outside the area of cryptocurrency are now being studied, notably traceability and digital identity. These uses have the following characteristics:

  • Many participants (including different business sectors) can use the same platform.
  • Conventionally, most of the interactions have not used an information system.

Various obstacles arise when an information system used by a specific organization needs to connect to another organization’s information system. Examples of such obstacles include the connection method and the emergency response method. Therefore, in some cases, paper-based work is done when connecting to another organization. Also, there may be cases in which documents are acquired from another organization in paper form and then have to be input to the acquiring organization’s information system. These are things to consider when looking at possibilities for using the blockchain to perform tasks currently being handled using the existing system.

4. Effects of blockchain when applied to traceability

Here, we explain the expected effects of applying blockchain to traceability. The example described here involves the case of a problem occurring in a product component. An investigation of such a problem would typically require a lot of time and effort to find when the component was made, which organization provided it, what type of product the component was used in, and other details. Moreover, the possibility of data tampering and/or data disappearance may need to be considered (Fig. 2).

Fig. 2. Conventional traceability system.

A distributed ledger—the key blockchain feature—is premised on sharing information between platform participants, recording transaction information in chronological order, and easily implementing the technologies for performing these functions. New participants can easily join and leave the blockchain because it is based on the premise that information is shared between participants. When problems occur, an investigation can easily be done by tracing the data structure because the data are managed in chronological order. Also, many different types of blockchain technologies can be easily used because mechanisms to access them via smartphones as well as via a web browser are provided (Fig. 3).

Fig. 3. Traceability system using blockchain.

Prompt transactions can be carried out, even with transactions that would conventionally be paper based, as information can be shared with the other organization through the blockchain by operating on a conventional computer screen. The possibility of shortening the operating time in international trade transactions has been reported [3].

5. Future perspectives

This article explored the application of blockchain technology to traceability. Although positive effects can be expected in such applications, such effects may be limited because blockchain technology is still in a growth stage. Research and development of higher uses of blockchain is necessary in order to advance the technology.

For instance, the following points require further research:

  • Concealment of data on blockchain [4]
  • Mechanism to easily manipulate data on blockchain
  • Improvement of consensus algorithm (agreement method of distributed ledger)
  • Mechanism to easily connect between conventional information system and blockchain

A research network for blockchain technology called [5] and an industry-academia cooperation organization called BASE Alliance [6] have been established. The focus on blockchain has thus spread to the academic sector as well.

In addition to technological development, efforts to establish legal systems and rules on system procurement by the government are also important. At the keynote speech in the opening ceremony of the Tokyo meeting, a representative from the Ministry of Economy, Trade and Industry reported on some government-leading projects as advanced use cases, including a demonstration project involving a land registry in Sweden, and a policy to create venture companies related to blockchain that was triggered by electronic governmentization (e-governmentization) efforts in Estonia.

Blockchain is certainly spreading from the elemental technology of cryptocurrency to other technology applications that use the distributed ledger. A world where the blockchain is used in an invisible part of the services that we use is not that far away.


[1] Website of JIPDEC,
[2] J. Kishigami, S. Fujimura, H. Watanabe, S. Ohashi, and A. Nakadaira, “Introduction to Blockchain Technology,” Morikita Publishing, Tokyo, Japan, 2017 (in Japanese).
[3] Appendix to the press release issued by NTT DATA on April 24, 2017 (in Japanese).
[4] H. Watanabe, S. Ohashi, S. Fujimura, A. Nakadaira, and S. Sakuma, “Technology and Challenges of Blockchain Platforms,” IEICE Tech. Rep., Vol. 117, No. 114, ICM2017-8, pp. 21–26, 2017 (in Japanese).
[6] Keio Research Institute at SFC; Keio University Center for Socio-Global Informatics; and Institute of Industrial Science, the University of Tokyo, “Announcement of BASE Alliance Establishment,” 2017.
Hideyuki Iwata
Senior Research Engineer, Supervisor, Research and Development Planning Department, NTT.
He received a Ph.D. in electrical engineering from Yamagata University in 2011. From 1993 to 2000, he conducted research on high-density and aerial optical fiber cables at NTT Access Network Service Systems Laboratories. Since 2000, he has been responsible for standardization strategy planning for NTT research and development. He has been a delegate of International Electrotechnical Commission (IEC) Subcommittee 86A (optical fiber and cable) since 1998 and of the International Telecommunication Union - Telecommunication Standardization Sector Telecommunication Standardization Advisory Group since 2003. He is a vice-chair of the Expert Group on Bridging the Standardization Gap in the Asia-Pacific Telecommunity Standardization Program Forum. In 2004, he received an award from the IEC Activities Promotion Committee of Japan for his contributions to standardization work in IEC.
Takashi Tominaga
Senior Manager, Strategic Business Creation Team, Research and Development Planning Department, NTT.
He received a B.S. in physics from Ehime University in 1995. He joined NTT in 1995 and worked at a corporate sales and service creation department of NTT WEST. Since 2017, he has been responsible for research and service creation in the area of financial technology.
Takeshi Morikawa
Producer/Manager, Produce Group, Research and Development Planning Department, NTT.
He Joined NTT in 1995 and was in charge of developing Internet networking systems that connected universities and elementary/secondary schools. In 2004, he was seconded to the Ministry of Economy, Trade and Industry of Japan, where he took part in establishing policies to promote home electric appliance networks. In 2007, he began overseeing the development of set-top boxes for digital broadcasting via the Internet. In 2011, he initiated the establishment of NTT SMILE ENERGY Corporation to provide maintenance services for solar power generation. He has been in his current position since 2015.