zkSync Era’s token airdrop (ZK) was huge: about 17.5% of ZK’s 21B supply (3.675B tokens) were set aside for users
okx.com
. Criteria were strict — for example, interacting with ≥10 distinct contracts (swaps, bridge, paymaster, etc.) was needed
okx.com
. The goal was to reward real usage (multi-step trades and bridge transfers). Unfortunately, a hack in April 2025 briefly shook confidence: an admin key was compromised and ~111M ZK were minted by an attacker (about $5M at the time), dropping ZK price ~15%
okx.com
. No user funds were lost, but it highlights risk in new networks. Always claim from official channels and secure any reward promptly.