Polish Prosecutors Arrest Fifth Suspect in Zondacrypto Fraud Case Tied to $100M in Customer Losses
Polish authorities charged a former associate of the exchange's founder on September 5, adding to a criminal probe that has already ensnared the president of Poland's Olympic Committee and left as many as an estimated 30,000 customers without access to their funds.
Polish prosecutors arrested Roman Ż. in the Silesia region on September 5, 2026, charging him with membership in an organized criminal group and unauthorized manipulation of computer data. He is the fifth person charged in the ongoing investigation into Zondacrypto, formerly one of Central and Eastern Europe's largest cryptocurrency exchanges, which collapsed earlier this year with estimated customer losses of at least 350 million złoty (roughly $83 to $100 million USD, depending on the exchange rate used). The exchange was founded in 2014 under the name BitBay and was at that time the largest crypto exchange in Central and Eastern Europe, before rebranding first as Zonda and then as ZondaCrypto in 2021.
Roman Ż.'s defense lawyer described his client as a former business partner of BitBay founder Sylwester Suszek who contributed to building the exchange's Katowice headquarters before the company underwent its rebranding. The defendant denied all allegations and submitted a lengthy statement to investigators. Prosecutors pushed for pretrial detention, arguing he posed a flight risk: a confirmed trip to China with a return ticket dated September 13 was cited as the primary concern. His defense counsel disputed that characterization, arguing the trip constituted legitimate business travel and did not indicate any intent to flee.
A Missing Founder, Inaccessible Bitcoin, and a Collapsing Exchange
The investigation traces back to a structural failure that Polish media have labeled the "dead man's key" problem. When founder Sylwester Suszek sold the company to an American investor in 2021 and management transferred to CEO Przemysław Król, the private keys controlling cold wallets holding approximately 4,503 BTC were never handed over. At the time of the exchange's collapse, those coins were worth around $334 million. Suszek disappeared on March 10, 2022, and his whereabouts remain unknown. Prosecutors have since merged the fraud investigation with a separate inquiry into his disappearance.
Warning signs predated the collapse by years. Poland's financial regulator, the KNF, placed BitBay on its public warning list as early as 2018. A 2020 investigative documentary by TVN, Poland's largest private broadcaster, alleged shareholder links to individuals with criminal backgrounds. Neither development halted the exchange's eventual failure.
On-chain data tells a stark story about what happened in the months before trading halted. In August 2024, the exchange's hot wallet held roughly 55.7 BTC. By March 2026, that figure had dropped to between 0.07 and 0.18 BTC, a depletion of approximately 99.7 percent. Between December 2025 and April 2026, blockchain records show 511 separate transactions moving assets off the platform to Kraken, totaling around $21 million across 30 different cryptocurrencies, according to on-chain analysis by Disruption Banking and Recoveris. The BTC component of those outflows alone amounted to approximately $4.59 million. Withdrawals began stalling in December 2025. The website went fully offline on April 23, 2026.
More than 3,600 formal complaints have been filed with prosecutors. Polish courts have secured over 100 million złoty (roughly $25 million) in assets for potential claimant compensation, with an additional 4 million euros frozen in a separate bank account.
On August 27, the Harju County Court in Tallinn accepted Zondacrypto's bankruptcy petition and opened a two-month window for creditors to file claims.
Political Dimension Complicates the Picture
Also detained in this investigation was Radosław Piesiewicz, president of the Polish Olympic Committee, arrested on August 27, 2026, on separate bribery allegations linked to the broader probe.
His involvement has drawn attention to the political layer of the scandal. Prime Minister Donald Tusk has publicly linked delays in passing MiCA (Markets in Crypto-Assets) implementation legislation to the exchange's political connections, stating that presidential vetoes of earlier bills came even as officials were aware of Zondacrypto's financial difficulties and political connections. Those vetoes were issued under a prior presidential administration, adding a cross-party dimension to the regulatory failures Tusk has sought to highlight. Poland's parliament began its first reading of MiCA implementing rules in May 2026.
Estonia's Financial Intelligence Unit, which had licensed Zondacrypto, acknowledged after the collapse that its supervision "did not extend to prudential supervision, including the safekeeping of customer assets, their existence, or the company's liquidity." The unit revoked Zondacrypto's operating license on June 29, 2026, more than six months after withdrawal delays first emerged and weeks after the platform had gone fully offline on April 23.
What This Means for Users in South Asia and Africa
The Zondacrypto collapse is, by some measures, the largest European crypto exchange failure since FTX, and its mechanics carry direct warnings for retail investors in markets where centralized exchange use is growing faster than regulatory oversight.
The "dead man's key" scenario, in which a single individual holds exclusive control over cold wallet private keys with no backup or multi-signature requirement, is not unique to Poland. Users in Nigeria, Kenya, Pakistan, and Bangladesh who hold funds on exchanges that do not publish verifiable proof-of-reserves face structurally similar risks.
The jurisdictional trap is equally relevant. Zondacrypto held an Estonian license that was technically valid across the European Union but offered almost no protection for customer assets in practice. The same offshore passporting dynamic applies in markets where exchanges registered in the Seychelles or British Virgin Islands serve domestic retail users who have limited legal recourse across borders. Polish users are now navigating an Estonian bankruptcy process, filing creditor claims in a foreign jurisdiction, in a foreign language, within a strict two-month deadline.
The Zondacrypto case makes the regulatory argument concrete: proof-of-reserves mandates, multi-signature custody requirements, and enforceable cold wallet transfer protocols are not bureaucratic formalities. They are the difference between recoverable funds and a blockchain address nobody can access.