Many airdrops do not reward everyone who shows up at claim time. Instead, the project takes a snapshot, a record of blockchain activity at a specific block, and distributes tokens only to addresses that qualified at that moment. Understanding snapshots explains why some users receive allocations and others, doing the same actions a day late, receive nothing.

A snapshot records balances, holdings, or activity at one chosen block height. For a holder airdrop, the project lists every address holding its token or NFT at that block. For an activity airdrop, it records users who swapped, staked, or provided liquidity before the cutoff. The snapshot itself costs nothing to users and happens silently in the background.

Projects usually announce snapshots in advance, retroactively, or not at all. Announced snapshots can trigger last-minute buying, while unannounced ones reward genuine earlier users. Either way, the rule is the same: only activity before the snapshot block counts, and anything after it is irrelevant for that distribution.

Typical criteria include holding a minimum balance, holding for a minimum period, completing specific on-chain actions, or participating in governance. Some projects filter out wallets that look like Sybil attackers, meaning one person controlling many addresses, by requiring varied activity or minimum transaction counts.

Eligibility checkers let you enter your address and see whether you qualify and how much you are allocated. Only use checkers linked from the project's official channels, and be wary of checkers that ask you to sign transactions just to view eligibility. Viewing should never require a signature that moves tokens or grants approvals.

You cannot reliably farm every snapshot, but good habits help. Use protocols you genuinely understand, keep some activity consistent over time rather than in one burst, and avoid splitting activity across dozens of empty wallets, which projects increasingly filter out. Keep records of your on-chain activity so you can verify eligibility claims later.

Above all, never buy a token solely because of a snapshot rumor. Prices often spike before an announced snapshot and fall right after, wiping out more value than the airdrop delivers. Treat snapshots as a bonus for activity you would do anyway, not as a reason to chase unfamiliar projects with real money.

Because snapshots reward past activity, some users try to game them by creating dozens of wallets and repeating identical actions across all of them. Projects have responded with Sybil filtering: analyzing transaction patterns, funding sources, and behavior to exclude clusters of wallets that look controlled by one person. Heavy-handed farming increasingly ends with zero allocation.

Filtering methods include checking whether wallets were funded from the same source, whether they performed identical actions within minutes, and whether they show any organic variety in timing and amounts. Genuine users naturally vary, while scripted farms leave fingerprints. Projects rarely publish exact filter rules, since that would help attackers evade them.

The practical lesson is to behave like a real user because you are one. Use a small number of wallets, interact with protocols you understand, and spread activity over time. If an airdrop excludes you despite genuine use, that is frustrating, but the alternative of aggressive multi-wallet farming now carries a real risk of being filtered out entirely.

Snapshot design keeps evolving, with some projects adding human verification, reputation scores, or minimum holding periods to reward committed users. Expect criteria to get stricter over time, and treat any strategy built on mass wallet creation as increasingly fragile. Authentic, sustained usage remains the most robust path to eligibility.

One last habit separates organized participants from frustrated ones: after every snapshot announcement, write down the block height, the criteria as stated, and your own qualifying activity. Months later, when the distribution arrives, that note lets you verify your allocation instantly instead of reconstructing history from memory. Snapshots reward people who were present and prepared, and a few lines of notes make preparation effortless.