When Exchanges Go Down

Crypto was supposed to remove the need to trust anyone. Then everyone went ahead and parked their coins on centralized exchanges run by young founders with cool nicknames and questionable spreadsheets anyway. The result has been over a decade of exchanges vanishing, “getting hacked,” or simply losing track of where the money went. Here’s a tour of the genre’s greatest hits.

Mt. Gox: The One That Started It All

Before it was the most infamous name in crypto, Mt. Gox was, unbelievably, a trading site for Magic: The Gathering cards, and its name literally stands for “Magic: The Gathering Online Exchange.” Programmer Jed McCaleb repurposed the domain into a Bitcoin exchange in 2010, then sold it to French developer Mark Karpelès in 2011. By 2013, Mt. Gox was handling something like 70% of all Bitcoin trades worldwide, making it, functionally, the entire market.

Which made it all the more alarming when, in February 2014, Mt. Gox abruptly froze withdrawals and then went dark entirely. It turned out the exchange had been silently bleeding Bitcoin since late 2011: a hacker had apparently gotten hold of an unencrypted private key years earlier and slowly drained funds while Mt. Gox’s own systems, lacking basic internal controls, failed to notice. By the time the dust settled, roughly 850,000 BTC belonging to the company and its customers (worth hundreds of millions of dollars then, tens of billions today) had disappeared. Bitcoin’s price cratered by over a third in the following weeks.

Karpelès was later convicted in Japan of falsifying data to cover up the losses, though he was cleared of the more serious embezzlement charges; the general verdict of history is “catastrophically negligent” rather than “mastermind.” In a plot twist nobody saw coming, he later “found” an old wallet with around 200,000 of the missing coins. Creditors are still, over a decade later, receiving partial repayments through a Japanese civil rehabilitation process, a slow-motion epilogue to crypto’s original sin.

BitGrail: The Italian Job That Nano Never Wanted

If you were a Nano (then called RaiBlocks) holder in early 2018, there’s a decent chance you’ve heard the name Francesco Firano, known online as “The Bomber,” with a grimace. Firano ran BitGrail, an Italian exchange that, thanks to Nano’s meteoric 2017 price run, ended up hosting a huge share of global Nano trading.

In February 2018, BitGrail announced it had lost roughly 17 million Nano (about $170 million at the time) to a “cyberattack.” Firano’s initial move was to ask the Nano development team to modify the network’s ledger to cover the shortfall, which the Nano developers flatly refused to do, pointing out (correctly) that it would defeat the entire point of a blockchain. Firano then tried blaming Nano itself, claiming a “bug” allowed double-spending.

Italian courts didn’t buy it. In January 2019 the bankruptcy court in Florence found that multiple hacks had actually occurred over the course of 2017, and that Firano waited until February 2018 to disclose them. He reportedly kept the exchange’s entire Nano holdings in an internet-connected “hot wallet,” which is roughly the crypto equivalent of leaving your front door open with a sign reading “please don’t.” The same court held Firano personally liable for customer losses, and his assets, including his car, were seized. In December 2020 Italian police publicly accused him of computer fraud, fraudulent bankruptcy, and money laundering, while acknowledging it was not yet clear whether he took part in the thefts or simply failed to improve security after discovering them. Victims are, to this day, still trying to recover what they can.

QuadrigaCX: The Exchange That Died With Its Founder

Canada’s largest crypto exchange collapsed in early 2019 under circumstances so strange they eventually became a Netflix documentary. QuadrigaCX’s 30-year-old founder, Gerald Cotten, reportedly died in India in December 2018 from complications of Crohn’s disease, while, according to the company, being the only person who held the passwords to the exchange’s cold wallets. Roughly C$215 million owed to about 76,000 customers suddenly could not be paid out.

The story only got stranger from there. Cotten had signed a will just twelve days before his death. Lawyers for creditors later petitioned to have his body exhumed to confirm he was actually in the coffin. The truth, once investigators dug in, turned out to be less a heist thriller and more a slow-motion embezzlement: Ontario securities regulators found Cotten had been running the exchange as a Ponzi-like scheme for years, creating fake customer accounts, trading against his own users with their money, and losing about C$28 million of customer money trading on other platforms. Most of the shortfall, roughly C$115 million, came from fraudulent trading on balances he had invented. There probably was no secret stash. He just lost it.

FTX: Too Big, Too Fast, Too Fake

The most spectacular flameout of them all. FTX, once the third-largest crypto exchange on earth and a Super Bowl advertiser, collapsed in a matter of days in November 2022 after reporting revealed its sister trading firm, Alameda Research, was propped up by billions in customer deposits that were never supposed to leave FTX in the first place. Founder Sam Bankman-Fried had spent years publicly insisting customer funds were kept separate and safe; prosecutors later showed roughly $8 billion of it had instead gone toward covering Alameda’s trading losses, luxury real estate, and hundreds of millions in political donations.

Bankman-Fried was convicted on seven counts of fraud and conspiracy in late 2023 and sentenced to 25 years in prison in 2024, with a court-ordered forfeiture of $11 billion. The Second Circuit upheld the conviction in June 2026, and in September he asked the Supreme Court to take up the case. Unlike Mt. Gox or BitGrail, this wasn’t a hack or a slow bleed: prosecutors and Bankman-Fried’s own former inner circle (several of whom testified against him) described a knowing, years-long scheme dressed up as a legitimate exchange.

The Pattern Behind the Pattern

Line these cases up and the “shady exchange” playbook becomes obvious:

• Commingling funds. Nearly every collapse traces back to an exchange treating customer deposits as its own working capital, for trading, for personal spending, or to plug earlier losses.
• Opaque custody. Users had no way to verify their coins were actually there, because “trust me” was the only audit most of these platforms ever offered. Proof-of-reserves and third-party audits, now standard talking points, exist because of exactly this failure.
• Hot wallets holding cold-wallet amounts of money. BitGrail and Mt. Gox both kept far too much value in internet-connected wallets: convenient for the exchange, convenient for whoever eventually walked off with it.
• Silence, then a sudden announcement. Withdrawal delays, vague statements about “technical issues,” and radio silence are the universal warning signs in every one of these stories, visible in hindsight and, often, in real time to anyone paying attention.
• A single point of failure. Whether it’s one password (Quadriga), one founder’s ego (BitGrail), or one firm quietly controlling both sides of the trade (FTX), the collapses all share a structure that centralized crypto keeps recreating: a single human being, or a tightly controlled inner circle, with total unaccountable control over other people’s money.

The Takeaway

None of this is really an indictment of the underlying technology: Bitcoin and Nano both functioned exactly as designed in the stories where they were involved. The coins didn’t fail; the humans holding the keys did. The recurring lesson, unglamorous as it is, is the old one: not your keys, not your coins. Exchanges are convenient, but every one of them is, structurally, a bet that the people running it are more honest than the last batch who weren’t.

This article is for informational purposes only and isn’t financial advice.