Sui validators filtered hacker transactions using mempool control.
The Move object model enabled selective transaction denial.
The case raises concerns on decentralization and censorship tradeoffs.
The recent freezing of $160 million on the Sui blockchain has drawn attention to the network’s inner mechanics and raised eyebrows across the crypto community. At the center of the event lies a sophisticated coordination among validators, leveraging the flexibility of Sui’s unique architecture.
In the case of the attack, validators stepped in quickly, filtering out all transactions linked to the hacker’s wallet at the mempool level. This means they effectively ignored any attempt from the hacker to move or manipulate the stolen funds before the transactions could be included in a block. This capability stems from Sui’s Move-based object model, where validators play a crucial role in packaging and approving transactions.
The Move Model: Built for Flexibility
Unlike traditional blockchain protocols, Sui’s architecture allows validators to decide which transactions to process. The Move language introduces a high level of control over individual digital assets—known as “objects”—which makes it easier for validators to take emergency action in cases like hacks or exploits.
This case also sheds light on a potential denylist mechanism built into the network, or at least made possible by its structure. Such mechanisms can be incredibly effective in crisis scenarios but also raise red flags regarding the network’s long-term decentralization.
Analysis: How Did Sui Officy Freeze $160M from a Hacker? By @tmel0211
Validators implemented transaction filtering at the mempool stage to ignore transactions from hacker addresses, leveraging the Move object model where validators control transaction packaging. The discussion… pic.twitter.com/prsGKLuikO
— Wu Blockchain (@WuBlockchain) May 23, 2025
Censorship Resistance vs. Emergency Control
This event has reignited the debate about centralization in blockchain networks. While the response was swift and likely prevented further losses, it revealed that a coordinated group of validators could unilaterally block specific transactions. Critics argue this could undermine Sui’s claims of censorship resistance and decentralization.
The key concern? If validators can act in unison to freeze a wallet today, what stops them from targeting arbitrary addresses in the future? The situation forces a reevaluation of what “decentralized” really means and whether emergency controls are a necessary compromise.
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