Ethereum remained the hardest-hit blockchain by crypto hack losses in the first half of 2026, according to Blockaid, even as Solana moved into second place after replacing Arbitrum.
The security firm said the pattern was driven largely by key compromises, a reminder that attackers often do not need to break the blockchain itself if they can seize control of private keys or wallet access. That leaves token holders, protocols and infrastructure providers exposed to theft even when the underlying network is still functioning normally.
Solana’s climb to the No. 2 spot marked a shift in where losses were concentrated. Arbitrum, which had ranked higher before, fell behind as the damage from key-related attacks spread across chains and wallets rather than staying tied to one network.
Ethereum’s position at the top is not new, but it underscores how often the largest and most widely used smart-contract network stays in hackers’ sights. Its size, activity and deep DeFi footprint make it a frequent target, while the broader crypto market continues to wrestle with basic operational security, from custody practices to key management.
For traders, the report is a fresh reminder that headline network activity is only part of the risk picture. A chain can keep processing transactions while users still lose funds through compromised keys, phishing or wallet breaches. That distinction matters for assessing whether a security incident is isolated or likely to spread.
Blockaid’s findings point to a security problem that is still being solved chain by chain, wallet by wallet. The next update to watch is whether later-2026 data shows the same concentration in key compromises, or whether losses start to shift toward a different attack pattern.
Ethereum led crypto hack losses in H1 2026 as key attacks hit users
Ethereum was the most affected blockchain by hacks in the first half of 2026. Solana replaced Arbitrum as the second most impacted network due to key security breaches.