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Analysis: Arbitrum froze KelpDAO hacker ETH as system-level transactions injected by the Security Council through ArbOS
BlockBeats News, April 21 — Dragonfly managing partner Haseeb Qureshi issued an analysis regarding the “Arbitrum Security Council freezing KelpDAO hacker’s 30,766 ETH,” stating that this transaction type is an ArbitrumUnsignedTxType (EIP-2718 type 0x65/101), which is a system-level transaction that cannot be signed by a regular EOA and can only be injected by the Arbitrum Security Council through ArbOS. This operation did not perform chain rollback or history rewriting; functionally, it is a state-level recovery: the attacker’s private key can still sign transactions, but the ETH at that address is transferred by the chain itself. This operation also demonstrates the powers of the Security Council described in Arbitrum’s gradual decentralization documentation under “catastrophic emergency” situations.