Glossary · crypto airdrops
Bridge
Service to move tokens between different blockchains (e.g. ETH from Ethereum to Arbitrum).
Bridge — a service to move tokens between blockchains. Example: you have ETH on Ethereum mainnet, you want to use it on Arbitrum (L2). Bridge moves it.
How it works
1. You send ETH to the bridge contract on Ethereum.
2. Bridge mints wrapped version (or unlocks pre-locked) on Arbitrum.
3. You receive ETH on Arbitrum.
Why farmers care
- Many airdrops require bridging: "bridge $100 → get points."
- Bridges themselves often run drops (LayerZero, Wormhole, Stargate).
- Cross-chain activity is weighted higher in snapshots.
Popular bridges
- LayerZero (Stargate)
- Wormhole
- Across
- Hop Protocol
- Synapse
- Native bridges (official Arbitrum/Optimism)
Risks
- ⚠️ Bridge hacks: $2.5B+ lost historically.
- ⚠️ Don't keep large balances on a bridge.
- ⚠️ Use proven bridges with high TVL and audits.
See also
Gas (Network Fee)
Fee paid to process a transaction. Paid in the network native token (ETH on Ethereum, SOL on Solana).
Layer 2 (L2) and Layer 1 (L1)
L1 — base blockchain (Ethereum). L2 — overlay for cheap fast transactions (Arbitrum, Optimism, Base).
Wallet
Software/device for storing crypto and signing transactions. The main crypto tool.
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