BACKSEAT Crypto-Asset Exchange Co., Ltd. — Japanese crypto-asset exchange operator overview

Wiki route

This entry sits under exchanges index. Read it with FSA crypto-asset exchange registration system — number system / Local Finance Bureau jurisdiction / registration requirements for adjacent context and Japan Financial Regulation — Legal Framework for Tokens, Crypto Assets, and Payments for the broader system boundary.

FSA registration number Kanto Local Finance Bureau 第00026号 · JVCEA member #1031 · registration date 2021-04-16

1. Entity / shareholders

• Trade name: BACKSEAT暗号資産交換業株式会社 (former name: 株式会社coinbook)
• English name: BACKSEAT Exchange Inc.
• Established: 2018年5月18日
• Head-office location: 〒102-0082 東京都千代田区一番町7番地1
• Parent company: the official company profile identifies BACKSEAT Inc. as the 100% shareholder as of April 30, 2026. The page reviewed in this round does not describe the parent’s own detailed capital composition, so this entry does not infer beyond it.
• Capital: ¥2,327 million (including capital reserves), as of April 30, 2026
• Fiscal year-end: 3

On the trade name: it is unusual in embedding the industry-category name into the company name, in the form “BACKSEAT暗号資産交換業”. The top of the corporate site proclaims “Web3”. The former brand “coinbook” still survives as the service name of the trading platform (service.coinbook.co.jp), and is configured to direct users to the company’s official site via URL redirect.

2. License / registration status

• Crypto-asset exchange business: Kanto Local Finance Bureau Director-General 第00026号 (registration date 2021-04-16)
• Financial instruments business (crypto-asset derivatives): the JVCEA listing reviewed on 2026-07-29 shows “crypto-asset exchange business” only (JVCEA #1031 Type I member). This entry does not infer registration status beyond the reviewed materials
• Electronic payment instrument exchange business / funds transfer business: no registration indication was identified in the company, FSA, and JVCEA materials reviewed on 2026-07-29. This does not establish that no such registration exists
• Associations joined: Japan Virtual and Crypto assets Exchange Association (JVCEA), Japan Digital Decentralized Finance Association, Japan Crypto Asset Business Association
• Bodies joined: JPCrypto-ISAC (joined 2026年4月), Nippon CSIRT Association (joined 2026年1月)

3. Supported assets

• The public price pairs that can be confirmed on the exchange page (service.coinbook.co.jp) are the 2 pairs ADA/JPY and NIDT/JPY (display as of 2026年5月).
• The service list includes broker, exchange, OTC, and IEO categories. The official page reviewed on 2026-07-29 did not identify a total asset count, so consult the current trading screen.
• NIDT (Nippon Idol Token): there is a track record of conducting an IEO, and quarterly periodic information disclosure continues (2026年4月 disclosure confirmed).

4. Scope of business

• Sales counter (easy crypto-asset trading): for individuals and corporations
• Exchange (spot): for individuals and corporations
• OTC (negotiated trading): stated
• IEO: with track record (NIDT)
• Staking: stated in the service menu, but suspension of staking and external deposits/withdrawals was announced as of 2026年2月25日 (detailed conditions disclosed)
• Fiat deposit: Japanese yen (bank transfer). The deposit account holder name was changed on 2026年1月 (former coinbook → BACKSEAT name).
• Both individual and corporate: the official site explicitly guides corporate account opening.

5. Market share / trading volume

• The company, FSA, and JVCEA materials reviewed on 2026-07-29 did not identify comparable monthly or annual trading volumes or account counts. This does not establish that no such disclosure exists.
• The current JVCEA member list identifies it as member #1031 among 32 Type I members. A member number does not indicate registration order or market ranking.
• Because no trading-volume or account-count figures are disclosed, this entry does not assert a market ranking or an institution-focused customer mix. For listing-count comparisons, see bitFlyer / Coincheck / GMO Coin, Inc. — Japan crypto-asset exchange operator overview (the IEO framework in general is Domestic IEO (Initial Exchange Offering) System + Major Cases timeline).
• Customer base: targets both individuals and corporations, as stated on the corporate site. Institutional OTC is also offered.

6. History / major events

This table is limited to corporate and regulatory milestones confirmed on the company’s current About and disclosure pages and the current JVCEA listing. Name changes without a confirmed date, notices without sufficient detail, and individual maintenance events are excluded. ^[Sources: https://www.backseat-exchange.com/about; https://jvcea.or.jp/member/.]

Within the company, JVCEA, and FSA sources designated for this review and checked on 2026-07-29, no administrative action, hack, or major system failure record was identified. This is not an assertion that none exists.

7. Strategic developments

• Capital information: the official company profile lists capital and reserves of ¥2,327 million and BACKSEAT Inc. as the 100% shareholder as of April 30, 2026. This entry does not infer increase dates or use of proceeds without a confirmed official disclosure.
• Building out security / compliance frameworks: successively joined industry bodies in the cybersecurity field, such as JPCrypto-ISAC (2026年4月) and the Nippon CSIRT Association (2026年1月).
• Suspension of staking and external deposits/withdrawals (February 2026): the official suspension notice does not characterize the reason as either a service contraction or a framework review, so this entry does not interpret it.
• **Proclaiming Web3 **: the corporate site’s catchphrase explicitly states “Web3”. It sets the social implementation of blockchain technology as a management goal.
• Within the company, JVCEA, and FSA materials designated for this review and checked on 2026-07-29, no IPO, overseas-expansion, or specific-partnership disclosure was identified. This is not an assertion that none exists.

8. Related persons

The roles and biographies below reflect the company’s official About page as reviewed on 2026-07-29 and do not guarantee future officer assignments. ^[Source: https://www.backseat-exchange.com/about.]

Related

• japan-financial-regulation — Japan financial regulation overall
• japan-bittrade-listing-process — General theory of the listing process (distinguished from individual companies’ listing activities)
• japan-stablecoin-regulatory-landscape — Related stablecoin framework
• jp-trust-type-sc-architecture — Related SC framework
• jp-exchange-sbi-vc-trade — SBI Group affiliates (contact points in executives’ careers)
• jp-exchange-bitflyer — Former bitFlyer president participates as auditor
• jp-ieo-system-and-cases — JP IEO framework / cases (including NIDT)
• jvcea-self-regulatory-overview — JVCEA self-regulatory system
• jp-vasp-parent-company-map — JP VASP parent-company map

Sources

• BACKSEAT Exchange corporate site (retrieved 2026-05-18)
• BACKSEAT Exchange — About us (company overview / list of executives) (retrieved 2026-05-18)
• coinbook service site (trading · notices) (retrieved 2026-05-18)
• coinbook.co.jp — former domain (notice of company name change) (retrieved 2026-05-18)
• JVCEA member introduction (retrieved 2026-05-18)
• FSA crypto-asset exchange operator registration list Excel (snapshot 令和8年4月1日 = 2026-04-01)