Crypto Hacks: How They Happen and How to Protect Yourself

Johnpaul Dike-Ndulue

6 min read

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Aug 10, 2026

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For the past decades in the crypto industry, billions of dollars have disappeared. Not slowly, but in minutes, sometimes in seconds, either through a single compromised key, a phishing link, or a malicious transaction that someone signed. The sad part is that there is no customer support line to call and no bank to file a claim with. It’s not a niche problem for reckless investors; it also hits exchanges, DeFi protocols, professional traders, and everyday holders. While the scale of losses keeps climbing and hacking tactics keep getting more sophisticated, it’s important to understand how crypto hacks happen and how to avoid them.

How Bad Is It? The Numbers Tell the Story

Let’s take a look down memory lane at the results and the severe losses. Chainalysis’s report shows that attackers stole $1.8 billion in 2022, $1.7 billion in 2023, $2.2 billion in 2024, and $4.04 billion in 2025.

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The threat profile through which these thefts occurred broadened significantly, from the famous DeFi smart contract bugs in 2021 to 2023 to compromises of centralized exchange operators in 2024 and 2025. Within the first few months of 2026, more than $1 billion was already lost to sophisticated hacks, including AI-driven exploits, supply chain attacks, and other familiar attack vectors.

List of the Biggest Crypto Hacks Since the Last Three Years

• Ronin Network (2022): Over $620 million was drained by hackers using compromised private keys via the bridge connecting the Axie Infinity game to Ethereum after gaining access to validator nodes for six days.
• FTX Collapse (2022): Actually, this incident wasn’t a hack but arguably the most damaging event in crypto history. It happened due to the internal misappropriation of over $8 billion. As a result, the exchange collapsed overnight, taking billions of depositors’ money with it.
• Euler Finance (2023): On March 13, 2023, hackers launched a flash-loan attack in the lending protocol’s code, draining over $197 million from it by borrowing a large amount and manipulating prices.
• DMM Bitcoin (2024): In May 2024, hackers stole over 4,502.9 BTC from a Japan-based exchange. DMM, in pursuit of protecting its clients’ assets, raised $320 million in emergency funding but was unable to recover, so it had to discontinue operations in December 2024.
• ByBit (2025): In February 2025, an attacker manipulated a transaction-signing process associated with a cold-wallet transfer. The FBI claimed that the theft was linked to North Korean TraderTraitor activity. To date, it remains the largest single crypto hack on record.
• KelpDAO (2026): In April 2026, attackers compromised a third-party system used for transaction verifications between blockchains, triggering a release of $292 million by tricking the system into believing that they had deposited and locked in valid collateral on one blockchain.
• Drift Protocol (2026): In April 2026, attackers gained exclusive access to the platform via social engineering, then created a fake token and used it as collateral to borrow about $285 million by manipulating its value to appear legitimate.

How These Hacks Actually Happen

It’s important to understand their mode of operation, as 90% of these hacks result from predictable flaws.

• Private key compromise: The private key acts as the primary password to a crypto wallet. Whoever holds it controls the funds. Most hacks involved compromised private keys obtained through malware on compromised devices, insider access, phishing attacks, or the exploitation of the operational security of companies that manage private keys for their users.
• Smart contract exploits: Since DeFi protocols run on code, whenever a flaw is found, attackers exploit it and drain the protocol before anyone can stop them. Flash loan attacks and integer overflow bugs are examples of such exploits.
• Social engineering: Scammers target users instead of the system. Some of their common tactics include impersonation of customer support or prominent public figures, phishing campaigns, fake job offers, and fraudulent airdrops or investment opportunities as bait.
• Phishing: Users receive emails or messages claiming their accounts have been compromised or require an update. The message contains a link to a site that looks exactly like the real platform, which then asks you to enter your login credentials or seed phrase.
• Bridge vulnerabilities: Cross-chain bridges are software that allows crypto to move between different blockchains. Though they’re complex and frequently audited, they’re also frequently exploited because they hold large amounts of assets.

How to Protect Yourself from Attackers’ Exploits: Practical Steps That Actually Work

Most people stop reading the right information and start making themselves vulnerable. These tips aren’t just theoretical; they are specific practices that help you avoid becoming a victim.

1. Use a hardware wallet for any inactive trade: The 70/30 split was never a myth. Secure about 70% of your crypto assets in an offline hardware wallet, as they protect you from malware, exchange hacks, and technical failures because they never connect to the internet. At the same time, the remaining 30% belongs in hot wallets for daily trading, staking, and earning yields.
2. Never share your seed phrase: This is the last thing you might want to do if you don’t want to lose your sanity, especially if you have a large holding of crypto assets. Any platform, support service, or protocol that requests your seed phrase is fraudulent. Avoid them. To protect your wallet, never enter your seed phrase online; write it down on a secure medium and store it in a physically inaccessible location.
3. Enable two-factor authentication: Most Exchange hacks target accounts that do not use it. Use an authentication app, such as Google Authenticator, rather than SMS verification, since phone numbers can be hacked through SIM card spoofing.
4. Check the transaction data before signing: authorizing malicious transactions is one of the main causes of cryptocurrency theft. Before confirming any transaction in your crypto wallet, check the contract address, the amount you are confirming, and whether you are familiar with the website or app requesting the transaction.
5. Be extremely cautious with calls to urgency: scammers exploit users’ psychology by pressuring them with limited‑time offers, urgent security warnings, and sudden demands to update something. No legitimate protocol or exchange requires you to act within a short timeframe, so take your time and verify the information yourself.
6. Use separate devices for crypto activity: Have a separate device for all your crypto activities and a different one for other purposes, as it creates a smaller attack surface than the multi-purpose device used for browsing, downloading files, and opening email attachments.

FAQs

Can stolen crypto be recovered?

In rare cases. Exchanges with fast-response teams have traced and frozen funds in various theft-related cases. Law enforcement agencies have improved their methods for tracking blockchain transactions, but once funds enter a private network or a mixer, they become almost impossible to recover.

What is a SIM swap attack, and how can I avoid it?

A SIM swap attack occurs when an attacker convinces the user’s mobile operator to transfer the user’s phone number to a SIM card in their possession, thereby intercepting SMS messages containing verification codes and bypassing SMS‑based two‑factor authentication. To avoid falling victim to such an attack, use an authentication app and never disclose which mobile operator you use.

How do I know if a DeFi protocol is safe to use?

No protocol guarantees safety, but you should watch for certain signals. Check for multiple independent security audits from reputable firms like Trail of Bits, Certik, or Halborn; check how long the protocol has been running, and if there’s a bug bounty program for security researchers to find problems before attackers do.

Do hardware wallets make you completely safe?

It does not completely make a user safe; they only protect your private key from remote theft because it never touches the internet. But they don’t protect you from signing malicious transactions that you approved yourself, from physical device theft with a weak PIN, or from retailers that sell tampered devices with compromised firmware.

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