Before and after almost every major airdrop, one term comes up: Sybil. Projects try to identify them, airdrop farmers try to avoid detection, and ordinary users may get caught in the crossfire. Understanding this can help you avoid a lot of pitfalls.

Token mentioned in this article: $ZRO Current price: 1.896 (24h +1.39%).

【What Is a Sybil?】

A Sybil attack is a concept from cybersecurity. It refers to one person controlling a large number of fake identities and posing as many independent users. In airdrops, “Sybil” usually refers to addresses that use batches of wallets to repeatedly farm eligibility.

Airdrops are intended to distribute tokens and governance rights to real users. If a large share goes to a small number of people farming rewards, the distribution loses its purpose, so projects put a lot of effort into screening for Sybils.

【How project teams detect Sybil activity】

A common method is to analyze links between addresses: whether their funds come from the same source, whether they interact at very similar times, and whether they follow exactly the same transaction paths. The more similar the patterns, the more likely the addresses are controlled by the same person.

Before distributing ARB in 2023, Arbitrum conducted Sybil screening. Before LayerZero’s 2024 airdrop, it published a preliminary list of around 800,000 addresses suspected of Sybil activity. Addresses identified as Sybil addresses were ineligible for the full airdrop allocation.

【A special approach】

In May 2024, LayerZero allowed users with multiple accounts to come forward voluntarily: addresses that self-reported could keep 15% of their original allocation, while the rest was redistributed to eligible users. It later opened a reporting program, under which successful reporters could receive a portion of the rewards.

This approach shows that projects are taking an increasingly strict stance against Sybil activity, and that the costs and risks of farming activity are also rising.

【A reminder for everyday users】

Sybil detection relies on statistical patterns, so legitimate users may inevitably be mistakenly flagged. If you are wrongly flagged, check whether the project offers an appeals process.

Stay away from tools and services that claim to “farm airdrops for you” or “guarantee eligibility”—many will ask you to import your private key or seed phrase. Don’t trust “eligibility-checking websites” from unknown sources either; always refer to the project’s official announcements for airdrop eligibility information.

【A final word】

Airdrops are never something project teams are obligated to provide, and the rules are becoming increasingly strict. Rather than spending a lot of money farming multiple accounts, spend your time understanding the project itself. Don’t rush into anything just because everyone around you is buying.

Have you ever misunderstood this point before?