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

Confidence: Likely Updated 2026-05-18 Review by 2026-08-08 Sources 5 Machine-translated Original (JA)
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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: BACKSEAT株式会社 (100% investment). The detailed capital composition of BACKSEAT株式会社 is not disclosed.
  • Capital: 2,327百万円 (including capital reserves) (as of 2026年4月30日) — capital increases were carried out in succession in 2026年1月 and 4.
  • 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): not disclosed — the JVCEA member category is “crypto-asset exchange business” only (JVCEA #1031 Type I member)
  • Electronic Payment Instrument exchange business / funds transfer business: not registered (not disclosed)
  • 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 the service categories of sales counter, exchange, OTC, and IEO, but the total number of handled listings is not explicitly stated on the official site.
  • 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

  • Monthly and annual trading volumes and number of accounts: not disclosed.
  • Among the JVCEA 33 社, Type I member #1031 (the 3 th from the latecomer side by member-number order). FSA registration number 第00026号 is a latecomer registered in 2021年.
  • From the fact that the listings displayed on the exchange remain the 2 pairs ADA · NIDT, and the suspension notice for staking and external deposits/withdrawals (2026年2月), it is presumed to be a niche / institution-leaning position, but there is no disclosed quantitative basis. For comparison of mainstream listing counts, 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

PeriodItem
2018年5月Established as 株式会社coinbook
2021年4月Crypto-asset exchange FSA registration (Kanto Local Finance Bureau 第00026号)
(unknown)Conducted the NIDT (Nippon Idol Token) IEO
(unknown)株式会社coinbook → renamed to BACKSEAT暗号資産交換業株式会社 (the former site coinbook.co.jp redirects to the new site)
6th term (令和4年4月–令和5年3月)Public notice of reduction in the amount of capital (details unknown)
9th term (令和7年4月–令和8年3月)Public notice of reduction in the amount of capital (9th-term portion)
2026年1月Capital increase · change of Japanese-yen deposit account holder name · joined the Nippon CSIRT Association
2026年2月Suspension of external deposits/withdrawals and staking service
2026年4月Capital increase (reached 2,327百万円, as of 2026年4月30日) · joined JPCrypto-ISAC
2026年5月Emergency system maintenance (5month 7day · 11day)

Public records of administrative dispositions / hacks / major system failures: none stated on the official site (separate confirmation of FSA administrative-disposition cases required).

7. Strategic developments

  • Successive capital increases in 2026年: capital was built up to 2,327百万円 through capital increases over 2 occasions in 2026年1月 · 4, from which an intent to strengthen the business base can be inferred. However, the purpose of the increases and the source of investment are not disclosed.
  • 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 (2026年2月): whether this is a service contraction or a framework review is not disclosed.
  • **Proclaiming Web3 **: the corporate site’s catchphrase explicitly states “Web3”. It sets the social implementation of blockchain technology as a management goal.
  • No public information on IPO, overseas expansion, or specific partnerships has been confirmed.
NameTitleBrief biography
林 政泰 (Masayasu Jonathan Hayashi)Representative Director and ChairmanSMBC Nikko Securities IB division → in charge of investments in Ripple, Securitize, etc. at SBI Investment · Headline Asia (VC). Youngest to rank in the Forbes Japan venture-investor ranking.
前田 慶次 (Keiji Maeda)Representative Director and PresidentExperienced FX systems · cover dealing · data scientist at the SBI Group. Handled AML/CFT · dealing · marketing at multiple crypto-asset exchange operators.
王 甦 (Steven Wang)Director / CTOOmron → NTT Data → SBI Group (crypto-asset exchange launch) → WhaleFin (crypto-asset exchange system operation). Former CTO of the former Coinbook.
星 典彰 (Noriaki Hoshi)Director / CCOServed as Director and General Manager of the Administration Division at SBI FX Trade, Representative Director and President of SBI Clearing Trust, etc. FXMTA secretariat.
三根 公博 (Kimihiro Mine)AuditorCompliance officer at Coincheck. Former bitFlyer president · former JVCEA chairman.
長田 忠千代 (Osada Tadachiyo)Auditor (outside)Representative Director and Senior Managing Director of The Bank of Tokyo-Mitsubishi UFJ → full-time Auditor of Tokyu.
鈴木 秀彦 (Hidehiko Suzuki)Advisor (Special Advisor attached to the CCO)From the Ministry of Finance · the FSA · the Kanto Local Finance Bureau of the Ministry of Finance. Practical experience in financial inspection and supervision.

Sources