The ZKsync Association has confirmed the restoration of $5 million price of stolen tokens from an April 15 ZKsync safety incident involving its airdrop distribution contract.
The hacker agreed to simply accept a ten% bounty and return 90% of the remaining stolen tokens, transferring the ZKsync Security Council nearly $5.7 million throughout three transfers on April 23.
“We’re pleased to share that the hacker has cooperated and returned the funds within the safe harbor deadline,” ZKsync Association posted to X on April 23, which was later reposted by ZKsync’s X account.
Matter Labs, the corporate behind the ZKsync protocol, additionally reposted the information shared on X.
The ZKsync X account beforehand confirmed that no user funds were compromised.
The hacker sent two transfers on the ZKsync Era blockchain, consisting of $2.47 million price of ZKsync (ZK) tokens and $1.83 million price of Ether (ETH) to the ZKsync Security Council’s ZKsync Era deal with.
Another 776 ETH price almost $1.4 million was additionally despatched to their safety council’s Ethereum deal with, Etherscan data exhibits.
The first switch was made on April 23 at 2:39:57 pm UTC on and the final switch was made roughly 13 minutes later — all throughout the 72-hour window that ZK Sync had initially set.
ZKsync Association mentioned the corporate would publish a ultimate report revealing extra particulars from the safety incident.
How the hack occurred
The hacker breached ZKsync’s admin account, permitting them to use the airdrop distribution contract’s sweepUnclaimed() operate to mint 111 million unclaimed ZK tokens, price roughly $5 million on the time of the April 15 assault.
The hack occurred whereas ZKsync was within the process of airdropping 17.5% of ZK’s token provide to ecosystem contributors.
The recovered quantity — nearly $5.7 million — exceeded the $5 million initially stolen as a consequence of an increase out there worth of the stolen tokens, with ZK and ETH rising 16.6% and eight.8% respectively because the April 15 assault, according to CoinGecko knowledge.
Despite the asset restoration, the ZK token did not rise considerably on the information and is at present down 0.2% over the past 24 hours.
ZKsync Era is an Ethereum layer 2 resolution that makes use of zero-knowledge rollups to batch and course of transactions offchain. It has almost $59 million in complete worth locked on its chain and has over $2 billion in real-world belongings onchain, according to DefiLlama and RWA.xyz.
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