10 Worst Scams and Hacks of cryptocurrency

The world of cryptocurrency, while innovative and transformative, has unfortunately been a fertile ground for scams and hacks over the years. From elaborate Ponzi schemes to sophisticated hacking attempts, the cryptocurrency space has seen its share of illicit activities. In this exploration, we will delve into the darker side of cryptocurrencies and uncover the ten worst scams and hacks that have left investors and the crypto community reeling. While the blockchain technology behind cryptocurrencies offers security and transparency, it’s crucial to remain vigilant and informed about potential risks. Learning from past incidents can help investors and enthusiasts better protect themselves and make informed decisions in this ever-evolving and sometimes treacherous digital landscape.

Bitconnect: The Ponzi Scheme Unveiled

Bitconnect was a cryptocurrency lending platform that promised astronomical returns to investors. Operating from 2016 to 2018, it assured daily interest rates of up to 1%. This seemingly lucrative opportunity attracted a large following, with investors pouring millions into the platform. However, in January 2018, Bitconnect abruptly shut down, leading to a colossal loss of funds for its users. Investigations revealed it was a classic Ponzi scheme, using funds from new investors to pay returns to earlier participants. The incident served as a stark reminder of the dangers of investing in platforms promising unsustainable, high returns in the cryptocurrency space.

The DAO Hack:

The DAO (Decentralized Autonomous Organization) was a groundbreaking Ethereum-based project that aimed to create a decentralized venture capital fund. However, in June 2016, it suffered a catastrophic hack due to a vulnerability in its code. The attacker exploited this flaw, draining approximately one-third of The DAO’s funds, equivalent to millions of Ether. This event led to a contentious hard fork in the Ethereum blockchain to reverse the hack’s effects, resulting in the creation of Ethereum Classic. The DAO hack underscored the challenges of smart contract security in blockchain and left a lasting impact on Ethereum’s development and governance.

QuadrigaCX: The Mystery of Missing Funds

QuadrigaCX, once Canada’s largest cryptocurrency exchange, faced a bizarre and tragic turn of events in 2019. Gerald Cotten, the exchange’s founder and CEO, passed away suddenly while on a trip to India. Following his death, it was revealed that he was the sole custodian of the exchange’s private keys, locking access to over $190 million in customer funds in cold wallets. Cotten’s death led to a series of legal battles and investigations, leaving thousands of QuadrigaCX customers in financial limbo. The case highlighted the need for transparency and safeguards in the cryptocurrency industry and raised questions about the exchange’s operations and Cotten’s actions.

The Mt. Gox Debacle:

Mt. Gox was once the world’s leading Bitcoin exchange, but in 2014, it faced a catastrophic collapse. Approximately 850,000 Bitcoins, worth over $450 million at the time, vanished from its wallets, with claims of hacking and security breaches. The exchange filed for bankruptcy, leaving thousands of users in financial turmoil. Subsequent investigations revealed mismanagement, internal theft, and a lack of security protocols. Mt. Gox’s demise significantly impacted the perception of cryptocurrency exchanges’ security and led to regulatory scrutiny. It remains one of the most infamous events in the history of cryptocurrencies, serving as a cautionary tale for the industry.

The Bitfinex Hack:

In August 2016, Bitfinex, one of the world’s largest cryptocurrency exchanges, fell victim to a major security breach. Hackers exploited vulnerabilities in the platform’s multisignature wallet system, resulting in the theft of approximately 120,000 Bitcoins, valued at tens of millions of dollars. To mitigate the losses, Bitfinex distributed BFX tokens to affected users, representing their stolen funds. This incident highlighted the ongoing security challenges faced by cryptocurrency exchanges and the importance of robust security measures. Bitfinex has since implemented various security enhancements and repaid the BFX tokens, but the hack remains one of the largest in the history of cryptocurrency.

PlusToken: The Multi-Billion Dollar Exit Scam

PlusToken, promoted as a high-yield cryptocurrency wallet and investment platform, turned out to be one of the largest exit scams in the crypto world. Operating primarily in Asia from 2018 to 2019, it amassed millions of users and lured them with promises of significant returns. However, in mid-2019, the platform abruptly ceased operations, vanishing with an estimated $2 billion to $3 billion worth of cryptocurrencies, including Bitcoin and Ethereum. Several key members of the scheme were arrested, shedding light on the elaborate Ponzi scheme. The PlusToken scam served as a stark reminder of the risks associated with high-yield investment platforms in the crypto space.

OneCoin: The Crypto Ponzi Pyramid

OneCoin, founded by Ruja Ignatova in 2014, was marketed as a revolutionary cryptocurrency investment opportunity. Operating as a multi-level marketing scheme, it attracted millions of investors globally, promising exponential returns. However, investigations soon revealed that OneCoin lacked a genuine blockchain, and its value was entirely fabricated. Ignatova disappeared in 2017, and subsequent legal actions exposed the scheme as one of the most extensive cryptocurrency Ponzi scams in history, defrauding investors of billions. Several individuals associated with OneCoin faced charges and arrests. The case underscored the need for stringent regulation and investor vigilance in the cryptocurrency space to protect against fraudulent schemes.

The Coincheck Hack:

In January 2018, Japan’s Coincheck cryptocurrency exchange experienced a devastating security breach. Hackers exploited vulnerabilities in the exchange’s systems, stealing approximately 523 million NEM tokens, valued at around $530 million at the time. The incident marked one of the largest cryptocurrency thefts in history. Coincheck promptly halted withdrawals and compensated affected users, but the hack raised concerns about the security measures employed by cryptocurrency exchanges. It also spurred regulatory changes in Japan, with authorities implementing stricter oversight of exchanges to prevent future breaches and protect investor interests. The Coincheck hack served as a stark reminder of the importance of robust cybersecurity in the crypto industry.

The Twitter Bitcoin Scam:

In July 2020, a high-profile security breach on the social media platform Twitter made headlines. Hackers gained unauthorized access to several prominent accounts, including those of Elon Musk, Barack Obama, and Joe Biden. They used these accounts to promote a Bitcoin giveaway scam, urging users to send cryptocurrency with the false promise of doubling their funds. The scam netted the attackers over $100,000 in Bitcoin before Twitter regained control. The incident exposed vulnerabilities in the security of influential social media accounts and highlighted the need for enhanced cybersecurity measures to protect against such high-impact scams in the cryptocurrency space.

The Parity Wallet Bug:

The Parity Wallet Bug was a critical vulnerability discovered in the Parity Ethereum wallet software in November 2017. This bug resulted in the accidental freezing of approximately $160 million worth of Ether. The issue stemmed from a user accidentally triggering a vulnerability within a smart contract, which subsequently led to the irreversible locking of the funds in the wallet. The incident raised concerns about the security and complexity of smart contracts on the Ethereum network and highlighted the importance of rigorous code audits and testing in blockchain development. Efforts were made to recover the locked funds, but the bug’s impact left a lasting impression on the crypto community.


In conclusion, the ten worst scams and hacks in the cryptocurrency world serve as stark reminders of the risks and challenges within this innovative but often perilous space. These incidents have left investors devastated, exposed vulnerabilities in exchange security, and prompted regulatory scrutiny. From the Mt. Gox debacle’s impact on early Bitcoin adoption to the audacious PlusToken Ponzi scheme, each event carries valuable lessons about due diligence, security, and the importance of regulatory oversight. As the cryptocurrency industry continues to evolve, vigilance, education, and stringent security measures remain paramount in safeguarding against future scams and hacks, ensuring a safer and more resilient crypto ecosystem.

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