What is an airdrop snapshot?
A snapshot is a record of blockchain state at a single block height. Teams use it to freeze the question of who qualified, so allocations can be calculated against a fixed picture rather than a moving one. Twenty eight of the 39 completed airdrops in our archive used one.
What a snapshot actually captures
Because a blockchain records every state change, a team can reconstruct exactly what any wallet held or did at any past block. A snapshot picks that block and reads from it.
What gets read varies. It might be a token balance, whether an address ever called a particular contract, cumulative trading volume, how long a position stayed open, or all of these combined into a score.
Retroactive and announced snapshots
The distinction that matters is whether the date is in the past when you first hear about it.
Retroactive snapshots are taken before any announcement. Uniswap read state from before September 2020 and told nobody until the token launched. 1inch, ENS and Gitcoin all did the same. By the time you learn about one, your allocation is fixed.
Announced snapshots name a future date. These are rarer, because publishing the date invites exactly the behaviour the team is trying to measure honestly.
Multiple snapshots and why teams use them
Reading a single block rewards whoever happened to hold at that instant, which is easy to game by borrowing for one block. Teams increasingly take several readings across a period and average them, or weight by how long a position persisted.
Curve weighted by how long liquidity stayed rather than how much passed through. Arbitrum scored activity spread across distinct months, with six or more months reaching the top tier. Both designs are deliberately resistant to a single well timed deposit.
What this means in practice
- If a snapshot has passed, nothing you do now changes your allocation for that airdrop.
- Moving tokens between your own wallets after a snapshot does not affect eligibility, because the record is already written.
- Selling after a snapshot but before the claim opens usually does not disqualify you, though terms vary and are worth reading.
- Because retroactive snapshots dominate, the only reliable strategy is using protocols you would use anyway, early.
See how airdrop eligibility works for the other mechanisms teams use.
