Why bridging exists
Each blockchain is an independent network. Ethereum doesn't know what's happening on Solana, and Solana doesn't know what's on Arbitrum. But DeFi users often need to move assets between chains — maybe to access a specific protocol, find better yields, or escape high gas fees.
Bridges solve this by locking your tokens on one chain and minting equivalent tokens on another. You end up with a "wrapped" version of your asset on the destination chain.
How bridges work
- You deposit tokens into the bridge's smart contract on Chain A (e.g., Ethereum)
- The bridge verifies the deposit and mints an equivalent amount of "wrapped" tokens on Chain B (e.g., Arbitrum)
- You receive the wrapped tokens in your wallet on Chain B
- To go back, the process reverses: burn the wrapped tokens, unlock the originals
Types of bridges
- Native bridges. Official bridges run by the chain itself (like Arbitrum Bridge, Optimism Gateway). Generally the safest but slowest.
- Third-party bridges. Stargate, Hop Protocol, Across — faster, often cheaper, but add trust assumptions.
- Aggregators. LI.FI, Socket — find the best bridge route across multiple providers.
The security reality
Bridges are the single most attacked piece of infrastructure in crypto. Over $2 billion has been stolen from bridge exploits. Ronin Bridge ($625M), Wormhole ($320M), Nomad ($190M) — these aren't fringe protocols. They were widely used.
The risk comes from complexity: bridges need to verify state across two different blockchains, which creates a large attack surface. A bug in the verification logic can let hackers mint tokens without depositing anything.
When you'd need to bridge
- Moving ETH from Ethereum mainnet to Arbitrum for cheaper DeFi
- Sending USDC from Ethereum to Solana to use a specific DEX
- Moving assets to a new L2 to farm early ecosystem incentives
Best practices
- Use native/canonical bridges when security matters more than speed
- Start with small amounts to verify the process before bridging significant sums
- Double-check the destination address and network
- Be aware of gas costs on both the source and destination chains
Start simpler
Bridging is an intermediate-to-advanced activity. Before you need to worry about cross-chain operations, build your foundational knowledge — trading mechanics, fee awareness, portfolio management. Korvex lets you practice all of that without the complexity of multi-chain interactions.