Snapshot Introduction
Snapshot is the process of recording the state of a blockchain at a specific point in time, commonly used for airdrop distribution, hard forks, and eligibility calculations for certain projects. Understanding block height and how balances are recorded helps in interpreting the relevant rules.
Snapshot What is
Snapshot originally referred to recording the state of a computer system or storage device at a particular moment. In a Blockchain, it generally means recording the ledger contents at a specific block height, including addresses, transactions, fees, balances, and metadata. It records the state at that time rather than continuously tracking subsequent changes.
Role in airdrops and hard forks
Airdrops often conduct a Snapshot before each distribution round, determining eligibility based on each address's token balance at the specified block height. After the record is completed, users can generally still move their funds. Hard forks also use Snapshot to first record the state of the main chain and then use eligible historical balances for the initial distribution on the new chain.
Other eligibility calculation scenarios
Snapshot can also be used to record the Initial Exchange Offering (IEO)balance required to participate in BNB. Specific rules are set by the project; for example, balances may be recorded randomly each day and averaged over a predefined period. Therefore, when reviewing the rules for a relevant activity, pay particular attention to the recording time, the balance methodology, and the eligibility conditions.
Original Tutorial
https://www.binance.com/en/academy/glossary/snapshot
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