The domestic cryptocurrency market recorded historic losses in April, raising widespread security concerns. The global cryptocurrency market in April 2026 experienced its worst-ever hacking incidents, sending alarm bells across the digital finance industry. According to a May 1st report by Bitcoin News, based on Defillama data, over 30 hacking incidents were reported within the month, resulting in losses of approximately $1.4 billion (about 1.9 trillion Korean Won). This marks the most severe record since the large-scale Bybit hack in February 2025, with both the number and scale of incidents reaching an all-time high. The severity of the April hacking incidents is further highlighted when compared to the entire first quarter of 2026. A total of 35 hacking incidents occurred during Q1, with losses amounting to $165 million. However, with over 30 incidents occurring in April alone, the number of hacks nearly matched the entire first quarter, while the losses soared to $1.4 billion, an astonishing 8.5 times higher. This represents the highest monthly record ever, clearly demonstrating the critical security crisis facing the cryptocurrency industry. Notable incidents include losses of $18.4 million from Rhea Finance, $15 million from Grinex, and $3.5 million from Volo Vault. Additionally, Hyperbridge suffered a $2.5 million loss, Sweat Foundation $3.5 million, and Wasabi Protocol approximately $5 million. Beyond these, dozens of smaller attacks, ranging from $50,000 to $1.5 million, occurred widely, indicating that not only large projects but also small to medium-sized platforms are becoming targets for hackers. Cryptocurrency security issues do not stem solely from technical flaws. The April hacking incidents predominantly featured sophisticated attack methods such as social engineering and access control failures, moving beyond initial smart contract vulnerabilities. Social engineering, a technique that cleverly exploits human psychology to bypass security, demonstrates that hackers have evolved to exploit user behavior beyond mere technical weaknesses. This represents an evolution from the early stages of DeFi hacks, which primarily focused on smart contract bugs, indicating that attackers' tactics are becoming increasingly diversified and sophisticated. According to Defillama data, attacks targeting DeFi platforms and bridges accounted for the majority of incidents, with the KelpDAO hack, in particular, sending a massive shockwave through the DeFi market. In the days following this incident, over $14 billion in Total Value Locked (TVL) was withdrawn from DeFi protocols, primarily concentrated in bridges and lending platforms. Investors rapidly pulled out their assets, demonstrating a sharp erosion of trust in DeFi platforms, a serious situation that could lead to a liquidity crisis across the entire DeFi ecosystem. Historically, hacking incidents surrounding cryptocurrencies have marked significant turning points in global IT history. While early attacks primarily targeted individual wallets, the focus of hacks has gradually shifted since DeFi platforms began handling large sums of capital. With the advent of smart contracts, attacks targeting programming vulnerabilities became more prevalent, and recently, more sophisticated attack vectors such as bridges and lending platforms have emerged. DeFi Platforms and Bridge Attacks Identified as Primary Hacking Vectors Defillama's cumulative statistics clearly illustrate the overall scale of cryptocurrency hacks. To date, reported cryptocurrency hacking losses have exceeded $16.5 billion, with DeFi-related losses accounting for approximately $7.7 billion, nearly half of the total. Losses from bridge attacks amount to approximately $2.9 billion, indicating that bridge systems connecting different blockchains are major targets for hackers. Notably, private key compromises and operational security failures remain the most common attack vectors across all categories. This suggests that human factors and operational management loopholes, not just technical vulnerabilities, continue to pose the greatest security threats. The cryptocurrency community is urging various security enhancements to address this crisis. Foremost among the proposed solutions is a multi-signature key management system. By implementing a system that requires approval from multiple parties rather than managing large funds with a single key, damage from a single individual's mistake or malicious act can be minimized. AI-based monitoring systems, capable of detecting and blocking abnormal transaction patterns in real-time, are also gaining attention. Strengthening protocol security is also a critical task. A system is needed for thorough security audits before smart contract deployment and continuous vulnerability monitoring and updates afterward. Some experts advocate for expanding bug bounty programs to incentivize white-hat hackers to discover and report vulnerabilities. Furthermore, there is a g
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