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Both Sui and Solana blockchains recently faced large-scale DDoS attacks. While Solana held up under pressure, Sui suffered visible slowdowns.
Author: Sahil Thakur
Published On: Tue, 16 Dec 2025 05:13:30 GMT
16th December 2025 – Both Sui and Solana blockchains recently faced large-scale distributed denial-of-service (DDoS) attacks. While Solana held up under pressure, Sui suffered visible slowdowns.
The Sui incident happened on December 14, 2025, and spilled over into the next day. Users noticed major transaction delays. Validators struggled to keep up, but the chain stayed online.
In contrast, Solana has been under attack for over a week—since around December 8. Despite this, it kept processing transactions smoothly.
The Sui network has 127 validators. Critics argue this number is too low for a secure, decentralized Layer 1 chain. The smaller validator set made the network easier to target. Attackers were able to disrupt block production without fully halting the chain.
Some called the event a “free stress test.” Others compared Sui’s validator structure to Solana’s, which has over 800 validators. These numbers make it harder for attackers to impact the entire network.
Developers and analysts suggested basic DDoS protection tools like Fail2Ban or iptables at the validator level. However, they agreed that Sui needs architectural improvements to scale securely.
The attack comes just months after smart contract exploits hit Sui-based projects like Typus Finance and Nemo Protocol. Those incidents drained millions, adding to the concerns about network reliability.
So far, the Sui Foundation has not released an official statement.
Solana is also under a sustained DDoS attack, but it has shown surprising resilience. Most users did not notice any slowdown. Apps continued working. Even stablecoin activity reached an all-time high of $16.6 billion in circulating supply.
Experts credited Solana’s performance to major backend upgrades over the past two years. The chain previously suffered from outages during high traffic events in 2021 and 2022. But now, it appears to have matured.
The validator count on Solana has dropped from ~2,500 to ~800 since 2023. However, the higher count still offers more DDoS protection than Sui. Also, Solana uses deterministic leader schedules and internal stress testing to prepare for such events.
Some see this attack as part of a larger pattern. On December 12, Solana project Almanak postponed its airdrop due to DDoS issues. This incident may be connected to the broader assault on Solana’s infrastructure.
Solana co-founder Raj Gokal confirmed the attack but highlighted that performance remained strong. Helius CEO Mert described the event as invisible to most users, calling it proof of network maturity.
Meanwhile, some on crypto X speculated about a “chain war” between ecosystems. Theories included sabotage by competitors or ideologically motivated actors targeting high-throughput networks.
In contrast, Sui’s delays reignited the decentralization debate. Crypto researcher Justin Bons used the incident to warn other chains, including Solana, not to cut validator counts further.
Real voices. Real reactions.
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