A single blockchain no longer dominates the crypto industry. Users commonly move assets across Ethereum, Solana, BNB Chain, Base, Polygon, and many other smaller networks. That way, they get access to lower-fee decentralized finance (DeFi) apps, NFTs, and gaming platforms.
This is done by using a technology known as a crypto bridge. They are therefore an essential part of the Web3 infrastructure, but also its biggest vulnerability. Some of the biggest hacks in history happened when bridges were targeted, proving how risky they are.
What is a Crypto Bridge?
The term refers to a protocol that allows digital assets and data to move between two separate blockchains. Most blockchains operate independently and therefore can’t recognize transactions or tokens from other networks. Bridges create a secure network, allowing it to happen.
For example, a user owning ETH on Ethereum who wants to use a DeFi application on Base, where transaction fees are much lower, doesn’t need to sell their assets and then buy them again on a different blockchain. Instead, they can use a bridge.
In most cases, your original tokens remain locked on the source blockchain, while an equivalent version is created or released on the destination chain. From the user’s perspective, the transition is seamless, but it’s actually a complex transaction using multiple smart contracts and verification systems behind the scenes.
How Crypto Bridges Actually Move Your Assets
Some crypto users treat it as a financial asset and don’t take an interest in the tech that powers them. Resources such as CCN allow holders to get a deeper look into the industry, covering crypto as both a tech and financial product.
A user chooses the blockchain from which they are sending the assets and the network on which they want to receive them. After approving the transaction, the tokens can either lock in a smart contract or permanently burn on the original chain. Then, validators or specialized messaging protocols verify that the transaction really occurred. Once they are verified, the destination blockchain releases liquidity or mints an equivalent token for your wallet.
Three main types of bridges do so:
· Lock-and-mint bridges create wrapped versions of assets on another chain.
· Liquidity-based bridges use pools of existing tokens instead of minting new ones, often making transfers faster.
· Burn-and-mint systems destroy the original asset before issuing a native version elsewhere.
Why Bridges are One of Crypto’s Biggest Security Risks
Crypto bridges secure millions of dollars in locked assets. Bitcoin and Ethereum rely on massive decentralized validator networks, whereas bridges often rely on smaller groups of validators, multisignature wallets, or complex smart contracts, which introduce additional attack surfaces. This makes them attractive targets for hackers.
The biggest such hack happened when attackers compromised validator keys and stole approximately $625 million worth of crypto in the Ronin Bridge hack. The Wormhole Bridge lost around $320 million after hackers exploited a flaw in its transaction verification shortly before. Hackers attacked Nomad Bridge after, and the losses were about $190 million.
None of these incidents involved breaking the actual blockchains underlying the transfer. The distinction is important because it shows that even the most secure blockchains are vulnerable to hacks when assets are moving between them.
How to Reduce the Risk When Bridging Crypto
No bridge is completely secure, but there are steps asset holders can take to reduce risk and keep their crypto safe. Make sure you’re using only established protocols. Those are the ones that have undergone independent security audits and have maintained a strong operational history.
Before making any transfers, users should double-check both the source and destination networks. If assets are sent to the wrong blockchain, they can be permanently lost if the wallet doesn’t have a recovery option.
It’s also useful to send a small amount as a test before making a large transfer. This will result in extra fees, but it’s preferable to losing the larger amount in the process.
Finally, avoid bridge links shared through social media, messaging apps, or unsolicited direct messages.
Conclusion
Crypto bridges are used to transfer funds from one blockchain to another. It’s a delicate part of the transfer and the most vulnerable to hacking. In fact, some of the biggest crypto hacks happened during the transfers.
Crypto users should consult reliable resources to learn how bridges work. They should also improve their security by adopting simple measures that mitigate some of the risks posed by crypto bridges.
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