JCB and Keychain Implement Offline Payments Using NFC

TOKYO, December 15, 2021 – (JCN Newswire) – JCB Co., Ltd. Japan’s only international payment brand (Headquarters: Tokyo, Japan) and Keychain GK (Headquarters: Singapore) implement offline payments using Near Field Communication (NFC), Sovereign Identity and blockchain technology.

Figure 1. Concept of offline payment

With the spread of 5G and the development of Internet of Things (IoT) devices, machine-to-machine payments will automatically fulfill contracts and make payments without human intervention, and potentially without network connectivity.

JCB and Keychain have developed the first payment infrastructure for machine-to-machine transactions that supports offline payments via NFC. By leveraging Keychain’s blockchain and self-sovereign identity technology, the system addresses operational risk challenges through network outages and distributed attacks.


The new infrastructure allows merchants to accept conditional payments even in the event that the payer and the merchant are disconnected from the network, a scenario known as double offline. Notably, the experience for shoppers is as easy as swiping a smart watch on the store’s payment terminal with this system.

As part of the collaboration with JCB, Keychain implemented the payment processing system using IoT devices, mobile phones and smartwatches, and demonstrated the following:

1. Payments can be processed under certain conditions, even in a double disconnection scenario.
2. Payment processing consensus can be performed simultaneously on mixed networks.
3. When restoring the network, offline transactions can be securely brought back online in batches.

The system uses the NFC network protocol and leverages Keychain Core to support small IoT devices with, in principle, as little as 32 megabytes of memory.

Figure 1. Concept of offline payment

About Keychain Core

Keychain Core is the award-winning Keychain solutions accelerator that brings the power of blockchain and distributed ledger technology to the common software development team, including self-sovereign identity, data security and consensus across a wide variety of devices, data and networks.

About JCB

JCB is a leading global payments brand and a leading credit card issuer and acquirer in Japan. JCB started its card business in Japan in 1961 and began to expand worldwide in 1981. Its acceptance network includes approximately 36 million merchants worldwide. JCB cards are issued primarily in Asian countries and territories, with over 140 million cardholders. As part of its international growth strategy, JCB has formed alliances with hundreds of leading banks and financial institutions around the world to increase its merchant coverage and cardholder base. As a full-service provider of payment solutions, JCB is committed to providing responsive, high-quality product and service to all customers around the world. For more information, please visit:

About the keychain

The digital transformation we need today is hampered by the lack of key capabilities — data security, key management, and sovereign identity. Keychain delivers these capabilities in the form of software building blocks, enabling everyday development teams to strengthen operational integrity, build digital assets, and discover new business models — with any data. , on any device, anywhere in the world.

Contact details for journalists on this subject

Ayaka Nakajima
Business communication
Phone. : + 81-3-5778-8353
Email: [email protected]

Key ring
MAIL: [email protected]

Source: JCB

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