DeFi hacks drained $621 million in April 2026 alone, spotlighting urgent crypto security risks and the need for robust blockchain vulnerability defenses.

According to @EmberCN, the threat of quantum computing to cryptocurrency is not a distant problem but a current crisis due to 'Harvest Now, Decrypt Later' attacks, where encrypted data is being stolen today for future decryption. This poses a significant risk to traders, as BlackRock highlighted quantum computing as a critical risk in its Bitcoin ETF filing, warning it could 'undermine the viability' of cryptographic algorithms. Researchers estimate that 4 million Bitcoin (BTC), or 25% of the usable supply, could be stolen once quantum computers are powerful enough. Ethereum (ETH) is also highly vulnerable, with co-founder Vitalik Buterin proposing emergency hard-forks that could lead to extended network downtime. A Reuters report suggests 'Q-Day,' when quantum computers can break current encryption, could arrive as soon as 2025. The transition to post-quantum cryptography is essential but could cause massive disruptions, with one study suggesting 75 days of downtime for Bitcoin. This long-term existential threat could render non-quantum-resistant digital assets worthless, a critical factor for any crypto investment strategy.