FCoin Founder Disclosed a 7,000-to-13,000 BTC Withdrawal Shortfall

FCoin founder Zhang Jian disclosed on February 17, 2020 that the cryptocurrency exchange’s reserves could not satisfy user withdrawals. In a statement titled “FCoin Truth,” he estimated the resulting shortfall at between 7,000 and 13,000 BTC.

That range was FCoin’s own estimate, not the result of an independent audit, court proceeding or regulator-supervised accounting. Even with that limitation, the admission marked a decisive change in the public record: what FCoin had initially presented as a technical interruption was now described by its founder as a funding crisis.

The disclosure mattered because FCoin had been an influential proponent of “transaction-fee mining,” a model that used the exchange’s FT token to reimburse trading fees and distribute revenue. Its breakdown demonstrated that reported trading activity, token incentives and promised revenue distributions could not establish whether a custodial exchange retained enough assets to meet customer liabilities.

From maintenance to a reserve shortfall

FCoin announced temporary maintenance on February 10, 2020. A February 11 update attributed the delay to a system vulnerability, while a February 12 notice referred to unavailable key personnel and damaged systems and data. The exchange then directed customers to request withdrawals by email.

Zhang’s February 17 account said those operational problems were consequences of the financial deficit rather than its underlying cause. He attributed the deficit to a combination of data errors and mistaken business decisions, while denying that an external hack or an internal theft had caused the failure.

Those explanations were claims by the executive responsible for the exchange. No independently verified reserve statement, complete liability schedule or wallet reconciliation accompanied the announcement. The surviving evidence therefore establishes what FCoin acknowledged, but not whether Zhang’s account completely or accurately identified how the assets were lost.

The transaction-fee mining problem

FCoin launched in May 2018 and rapidly attracted activity by returning trading fees in newly distributed FT tokens. It also advertised distributions tied to 80% of exchange revenue. The structure rewarded frequent trading and connected the platform’s operating economics to the price and issuance of its own token.

In Zhang’s reconstruction, FCoin’s systems mistakenly credited some users with excessive mining rewards or distributions during 2018. He said the exchange did not have an adequate financial accounting system during its early expansion and initially underestimated the losses. FCoin then used company resources and Zhang’s personal proceeds to repurchase FT, according to the statement, allowing the reserve deficit to deepen rather than resolving it.

The account did not provide transaction-level evidence for those assertions. Nor did it separate customer liabilities by asset, establish that the entire deficit consisted of missing bitcoin, or explain the methodology behind the 7,000-to-13,000 BTC range. The figure is best understood as a BTC-denominated estimate of aggregate non-payment supplied by FCoin.

What customers were promised

Zhang said email-based withdrawal processing would continue for approximately two to three months. Because available assets were insufficient, he also proposed using personal resources and profits from a future project to compensate customers over time.

That proposal was not a funded repayment plan. The February 17 statement identified no escrowed assets, repayment priority, enforceable schedule or independent administrator. Customers therefore had an acknowledgment of a deficit and a personal pledge, but no verified route to full recovery.

Why the disclosure mattered

FCoin’s failure highlighted a structural weakness of centralized cryptocurrency custody in 2020. Users could observe token prices and reported exchange volume, but they generally could not verify an operator’s assets, liabilities, internal accounts or use of customer deposits. Blockchain visibility alone did not solve that problem when wallet ownership and off-chain obligations remained undisclosed.

The strict conclusion from February 17 is consequently narrower than later descriptions of FCoin’s collapse: its founder acknowledged that reserves could not meet withdrawals and estimated the gap at 7,000 to 13,000 BTC. Whether the deficit resulted solely from the stated accounting and management failures remained unverified on the event date.