Cross-Chain Bridges

Why Bridges are Necessary

Blockchains (such as Bitcoin, Ethereum, and Solana) are isolated cryptographic silos. Bitcoin native ledger cannot read or process transactions executing on Ethereum virtual machines.

Bridges create communication highways between these separate ecosystems.

How the Mechanics Work (Lock, Mint, and Burn)

The most common bridge design follows a three step custody process:

1. Deposit and Lock: You send native tokens (such as 1 ETH) to a bridge smart contract vault on Ethereum, where the funds are locked.
2. Minting Wrapped Tokens: The bridge validator network verifies the deposit and mints an identical wrapped synthetic token (such as 1 WETH) on the destination chain (like Solana).
3. Unlocking on Return: When returning, the wrapped token on Solana is permanently burned, triggering the bridge vault on Ethereum to release the original native ETH back to your wallet.

Why Bridges are High Value Attack Targets

Cross chain bridge vaults hold billions of dollars in pooled collateral, making them the most targeted smart contracts in Web3 history: 1: Validator Key Compromises: Historic exploits (like the Ronin Bridge exploit) occurred when hackers compromised validator multi signature keys.

1. Smart Contract Vulnerabilities: Flaws in verification logic have led to unauthorized minting exploits.
2. Rule: Use trusted native canonical bridges whenever possible, and never leave long term capital idle inside bridging contracts.

Explore decentralized protocols and trading tools in our Complete Guide to Centralized and Decentralized Exchanges.