Cryptocurrency has grown into a global financial industry worth trillions of dollars. It has created new opportunities for investment, innovation, and digital ownership. However, alongside that growth, it has also attracted fraud, weak oversight, and some of the largest financial scandals in modern history.
Over the years, crypto markets have experienced exchange hacks, fraudulent investment schemes, collapsed token ecosystems, and outright deception that wiped out billions of dollars in investor funds. Some of these cases were the result of poor security. Others involved deliberate fraud and misuse of customer money.
This article ranks the most significant crypto scams of all time, based on the amount of money lost and the level of impact they had on the wider crypto industry.
7. Bitfinex Hack
Year: 2016
Amount Lost: 120,000 BTC
Dollar Value: $72 million
The Bitfinex hack in 2016 was one of the largest exchange breaches at the time. Hackers stole about 120,000 Bitcoin from the exchange. At the time of the theft, the value was around $72 million. However, when Bitcoin later reached peak prices above $60,000, the stolen coins were worth billions.
Bitfinex later spread the losses across users by reducing balances and issuing recovery tokens. Over time, many users were compensated. Several individuals connected to the laundering of the stolen Bitcoin were later arrested by U.S. authorities. The hack showed how even major exchanges with security systems can still be vulnerable.
6. Mt. Gox Hack
Year: 2014
Amount Lost: 850,000 BTC
Dollar Value: $450 million
Mt. Gox was once the largest Bitcoin exchange in the world, handling most Bitcoin trades globally. In 2014, Mt. Gox announced that about 850,000 Bitcoin were missing and likely stolen. At the time of the collapse, Bitcoin was trading at roughly $400 to $600, which meant the loss was worth around $450 million then.
However, as Bitcoin’s price rose in later years, the scale of the loss became much larger. When Bitcoin reached its peak price of about $69,000 in 2021, the missing 850,000 Bitcoin would have been worth over $58 billion. Most users did not immediately recover their funds, and the exchange shut down.
5. BitConnect
Year: 2018
Amount Lost: $2.4 billion (mostly in Bitcoin deposits converted to BCC)
BitConnect promised guaranteed daily returns through what it called a secret trading bot. Investors first had to send Bitcoin (BTC) to the platform, which was then converted into BitConnect’s own token, called BCC. They were told they could earn up to 1% per day. The platform heavily promoted referral bonuses, which made it operate like a classic Ponzi scheme.
When regulators began investigating in early 2018, the platform suddenly shut down. The BitConnect token price collapsed from over $400 to nearly zero. The U.S. Department of Justice later described it as a global Ponzi scheme that caused approximately $2.4 billion in losses, mostly from Bitcoin deposits made by investors.
4. PlusToken
Year: 2019
Amount Lost: $4–5 billion
PlusToken targeted investors mainly in China and South Korea. It claimed to be a high-yield crypto wallet offering passive income. Millions of users deposited Bitcoin, Ethereum, and other cryptocurrencies.
Investigations later showed the operators moved and sold large amounts of stolen crypto. Chinese authorities reported that the scam involved between $4 billion and $5 billion in digital assets. Several organizers were arrested, but many victims never recovered funds.
3. FTX Collapse
Year: 2022
Amount Lost: $8–10 billion
FTX was one of the largest crypto exchanges in the world before collapsing in November 2022. It was valued at over $30 billion and backed by major investors. However, investigations revealed that customer funds were secretly used to support risky trading activities by Alameda Research.
When users rushed to withdraw money, the exchange did not have enough funds. Bankruptcy filings showed that approximately $8 to $10 billion in customer assets were missing or misused. The founder, Sam Bankman-Fried, was later convicted on fraud charges. This collapse triggered widespread panic and heavy regulation discussions worldwide.
2. Terra / LUNA Collapse
Year: 2022
Amount Lost: $40+ billion
The Terra ecosystem included TerraUSD, an algorithmic stablecoin meant to stay equal to $1, and its partner token LUNA. The system depended on market incentives instead of real cash reserves.
When confidence dropped, TerraUSD lost its peg, and both tokens collapsed within days. More than $40 billion in market value disappeared. While debate continues over whether this was fraud or extreme economic design failure, the impact was enormous. Many investors lost savings, and the collapse triggered broader market declines.
1. OneCoin
Year: 2014–2017
Amount Lost: $4–5 billion
OneCoin ranks as the most infamous crypto scam because it was built entirely on deception. It claimed to be a revolutionary cryptocurrency but had no real blockchain. There was no transparent ledger, no public mining, and no real decentralization.
The scheme raised between $4 billion and $5 billion globally. It operated through aggressive recruitment and flashy events. The founder, Ruja Ignatova, disappeared in 2017 and remains missing. Several associates were arrested and convicted.
OneCoin stands at number one not just because of the money involved, but because it was a fully fabricated cryptocurrency that never truly existed as advertised. It damaged trust across multiple continents and remains one of the largest financial frauds connected to crypto.
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