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Jefferies warns banks after $606M crypto exploits in April

By Estefano Gomez · Published April 21, 2026 · 2 min read · Source: Crypto Briefing
EthereumWeb3RegulationBlockchainSecurity

Jefferies warned banks to rethink blockchain after $606M in crypto exploits during April. The Polymarket contract on another crypto hack over $100 million by December 31 sits at 100.0% YES.

Kelp DAO and Drift Protocol both suffered major losses, with the incidents tied to potential North Korean hackers. The Crypto Hack Predictions for 2023 contract is at 100.0%, with 255 days remaining. Traders are pricing in near-certainty of at least one more $100M+ exploit before year-end.

Volume is at $0 traded, meaning current prices reflect sentiment rather than actual liquidity. The thin order book makes this contract vulnerable to sharp moves from a single large trade. The absence of recent activity could indicate either firm conviction at current levels or simple disengagement.

At 100.0%, a YES share offers zero upside. The only trade with potential return is betting NO, which requires a historically unprecedented lull in DeFi exploits through the rest of the year. Given the frequency of $100M+ hacks in recent years and the ongoing pattern of state-linked hacking groups targeting DeFi protocols, that bet looks poor.

Watch for blockchain security reports from CertiK and Elliptic. Confirmation of new vulnerabilities or successful patches could shift sentiment. ZachXBT and TRM Labs’ attribution work on hacker activity will also matter for how traders assess ongoing risk.

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