Coincheck Hack (January 2018) – The Largest Hack Until 2021
The Coincheck Hack of January 2018 saw hackers steal $534 million worth of NEM tokens by exploiting unsecured hot wallets, making it the largest cryptocurrency heist until 2021. This incident exposed critical security flaws and led to a regulatory crackdown in Japan’s crypto industry.
- Background: Rise of Coincheck as a leading Japanese exchange.
- The Hack: Exploiting unsecured hot wallets to steal $534 million in NEM.
- Who Was Responsible: Suspected North Korean hacker groups like Lazarus.
- Impact: Regulatory response in Japan.
- Lessons Learned: Importance of cold wallets.
In January 2018, one of the largest hacks in history rocked the cryptocurrency community. Coincheck, a prominent Japanese cryptocurrency exchange, fell victim to a devastating attack that exposed critical vulnerabilities in its security systems. The hack not only shook the exchange but also highlighted the risks associated with unsecured hot wallets in the cryptocurrency world.
Rise of Coincheck as a Leading Japanese Exchange
Founded in 2012, Coincheck quickly gained recognition as one of Japan’s leading cryptocurrency exchanges. By 2018, it had built a substantial user base, handling millions of dollars in transactions each day. Its platform enabled users to trade a variety of cryptocurrencies, and many viewed it as a key player in the Japanese market. However, Coincheck’s rapid rise also came with challenges, particularly in ensuring the security of its funds.

The Hack: Exploiting Unsecured Hot Wallets to Steal $534 Million in NEM
On January 26, 2018, hackers targeted Coincheck and exploited vulnerabilities in the exchange’s hot wallet system. Hot wallets, which store cryptocurrency connected to the internet, are highly susceptible to cyberattacks due to their online nature. In this case, hackers were able to infiltrate Coincheck’s hot wallets, stealing approximately $534 million worth of NEM (XEM) tokens.
The scale of the hack was unprecedented at the time, making it the largest cryptocurrency hack until the infamous 2021 Poly Network breach. Hackers transferred the stolen NEM tokens to various addresses, leaving Coincheck scrambling to trace and recover the funds.

Who Was Responsible: Suspected North Korean Hacker Groups Like Lazarus
Many analysts believe that a North Korean hacker group carried out the Coincheck hack, with many pointing to Lazarus, a notorious group linked to numerous high-profile cyberattacks. Lazarus has been implicated in a series of attacks on cryptocurrency exchanges, and experts suggest that North Korea was using the stolen funds to support its government’s activities.
Coincheck itself did not immediately attribute the hack to any specific group, but the technical nature of the attack and the scale of the funds stolen strongly suggested a state-sponsored actor. The Lazarus Group regularly targets both cryptocurrency exchanges and financial institutions to steal funds, making them a prime suspect.
Impact: Regulatory Response in Japan
The Coincheck hack sent shockwaves through the cryptocurrency community, not just in Japan but globally. The incident exposed significant weaknesses in the security protocols of exchanges and highlighted the lack of regulatory oversight in the burgeoning cryptocurrency sector.
In response, Japan’s Financial Services Agency (FSA) took immediate action, imposing stricter regulations on cryptocurrency exchanges. These measures included mandatory security audits and requirements for exchanges to improve their anti-money laundering (AML) and know your customer (KYC) procedures. Coincheck halted withdrawals and took steps to mitigate further losses.
This regulatory crackdown helped solidify Japan’s position as one of the leading countries in cryptocurrency oversight. However, it also underscored the need for exchanges to adopt robust security measures to protect users’ funds.
Lessons Learned: Importance of Cold Wallets
The Coincheck hack served as a wake-up call for the entire cryptocurrency industry, highlighting the dangers of storing large amounts of digital assets in hot wallets. Although hot wallets offer convenience for everyday transactions, they face far greater vulnerability to hacks compared to cold wallets, which remain offline and immune to online attacks.
As a result of the Coincheck breach, many exchanges and individuals began to place a stronger emphasis on cold storage for their assets. Cold wallets, such as hardware wallets, offer a secure way to store cryptocurrencies offline, ensuring that even if an exchange is compromised, the funds stay safe.
The incident also reinforced the need for exchanges to implement multi-layered security protocols, including two-factor authentication (2FA), encryption, and regular audits, to safeguard against future attacks.

Secure Your Crypto with a Cold Wallet
Keeping your crypto safe is more important than ever. With the rise of ETF staking and institutional adoption, protecting your Ethereum and other digital assets should be a top priority.
A cold wallet ensures that your funds remain safe from hacks, scams, and online threats. Unlike hot wallets, which are connected to the internet, cold wallets keep your private keys offline, offering maximum security.
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Coincheck Hack – Quiz: Answer the following questions in 2-3 sentences each.
- What was the Coincheck hack, and how much was stolen?
- How did the hackers exploit Coincheck’s hot wallets?
- Which hacker group is suspected to be responsible for the attack?
- What impact did the Coincheck hack have on cryptocurrency regulation in Japan?
- Why are hot wallets more vulnerable to hacks than cold wallets?
- What security measures did Coincheck implement after the hack?
- How did the Coincheck hack influence the cryptocurrency community’s view on security?
- What role did North Korea’s Lazarus Group play in the Coincheck hack?
- Which actions did Japanese authorities take immediately in response to the breach?
- What is the key lesson the cryptocurrency industry learned from the Coincheck hack?
Quiz Answer Key:
- The Coincheck hack involved the theft of $534 million worth of NEM tokens by exploiting hot wallet vulnerabilities.
- Hackers exploited unsecured hot wallets connected to the internet to steal the NEM tokens.
- The Lazarus Group, a North Korean hacker group, is suspected of being responsible for the hack.
- The hack led to stricter regulations for cryptocurrency exchanges in Japan, including mandatory audits and enhanced security measures.
- Hot wallets are connected to the internet, making them more susceptible to cyberattacks than cold wallets, which are offline.
- After the hack, Coincheck implemented additional security measures and halted withdrawals.
- The hack highlighted the importance of securing digital assets, leading to greater focus on secure storage methods like cold wallets.
- Lazarus is believed to have orchestrated the attack to fund North Korea’s activities through stolen cryptocurrency.
- The Japanese Financial Services Agency (FSA) introduced stricter regulations and security protocols for exchanges.
- The hack reinforced the need for cold wallets to secure cryptocurrency from cyberattacks.
Glossary of Terms
Hot Wallet
A digital wallet connected to the internet, used for storing cryptocurrency for quick access, but more vulnerable to hacks.
Cold Wallet
A digital wallet not connected to the internet, offering offline storage for cryptocurrency and enhanced security.
NEM (XEM)
A cryptocurrency focused on providing a fast, scalable, and secure platform for decentralized applications.
Lazarus Group
A North Korean hacker group linked to various high-profile cyberattacks, including cryptocurrency heists.
Regulatory Response
Actions taken by authorities to introduce new laws or regulations in response to an incident or issue, in this case, cryptocurrency exchange security.