TL;DR
A bridge is a protocol that transfers tokens between different blockchains, allowing you to move assets from Ethereum, BSC, or other chains to Solana and back.
When you bridge USDC from Ethereum to Solana, the bridge locks your USDC on Ethereum and mints an equivalent amount on Solana (or releases it from reserves). The bridge maintains a 1:1 backing between the locked and minted tokens. To bridge back, the process reverses: tokens are burned on Solana and unlocked on Ethereum. Different bridges use different security models for this lock-and-mint mechanism.
Wormhole is the most widely used Solana bridge, connecting to 20+ chains. deBridge offers fast, low-fee cross-chain swaps. Mayan uses Wormhole’s infrastructure with an improved UX. Allbridge provides stablecoin-focused bridging. Portal (by Wormhole) handles large institutional transfers. For most users, aggregators like Jupiter or LI.FI find the best bridge route automatically.
Bridges are one of the highest-risk components in DeFi. The Wormhole bridge was exploited for $320M in 2022. Bridge hacks account for billions in total losses across crypto. Risks include smart contract bugs, validator/guardian compromise, and bridge token depegging. Minimize bridge exposure: bridge only what you need, use established bridges, and don’t leave funds in bridge contracts longer than necessary.