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Exchanges / Wider check / Coincheck
WIDER CHECK · NO SCORE · 9 OCT 2026

Coincheck: what the sources say

No MiCA authorization found Limited search: no Rigor score

Key facts

Regulation, reserves, fees

MiCANot foundNone found in the ESMA interim register
Italian residentsNot verifiedRegistry check pending
Proof of reservesNot verifieddetails not verified
Spot fees (base tier)Not verifiedmaker / taker

Reserves note: Not checked.

Track record

Incidents and regulator actions found

Security incidents

  • 2018-01 (reported 2018-01-28) Theft of 523,000,000 XEM (over USD 523 million at the time) affecting about 260,000 users. Outcome: Coincheck announced it would reimburse all affected holders in yen from company funds; yen withdrawals resumed 2018-02-13; FSA was to assess its ability to repay. source

Regulator and court actions

  • 2018-01-29 Japan Financial Services Agency: FSA ordered Coincheck to improve operations, required an incident report and prevention plan, and said it would fine the company (amount undetermined at the time). Outcome: Final fine amount not reported in source read PRESS OR OTHER SOURCE · official text not found source
  • 2018-02 Tokyo District Court (private plaintiffs): Up to ten traders filed suit over Coincheck's freezing of withdrawals. Outcome: Yen withdrawal claim reported resolved; other claims pending as of 2018-02-13 PRESS OR OTHER SOURCE · official text not found source
Limits

What we could not verify

Not verified: website, Coincheck Inc. details, any post-2018 incidents (a data-breach page was not readable), final FSA outcome, EU/Italy acceptance, OAM, PoR, fees, products.

Facts are as of 9 Oct 2026. We ran a limited number of searches per exchange, so an empty list is not proof that nothing happened. We did not check the Italian OAM register. Items from press or third parties are reports, not findings by an authority. If something here is wrong or out of date, send a correction with a source: corrections policy. Education only, not investment advice.

Sources

  1. [1] ESMA interim MiCA CASP register (CSV) accessed 2026-10-09
  2. [2] Crowdfund Insider - Coincheck to reimburse (2018-01-28) accessed 2026-10-09
  3. [3] Finance Magnates - Coincheck resumes yen withdrawals, lawsuit (2018-02-13) accessed 2026-10-09
  4. [4] Finance Magnates - FSA to fine Coincheck (2018-01-29) accessed 2026-10-09
  5. [5] Finance Magnates - Coincheck registered as crypto exchange accessed 2026-10-09
  6. [6] EdgarTools - Coincheck Group N.V. (CNCK) accessed 2026-10-09
  7. [7] FXEmpire - Coincheck (third-party) accessed 2026-10-09