What are cross-chain bridges?
A cross-chain bridge is a protocol that enables assets, data, or instructions to move between two independent blockchain networks that cannot communicate with each other natively. Each blockchain operates as a closed system with its own consensus rules, validators, and ledger. A token native to Ethereum does not exist on Solana. A bridge is what allows value to cross that boundary.
Stablecoins are the most commonly bridged asset class, since USDC and USDT serve as the unit of account for DeFi and payment activity across many chains at once.
How do cross-chain bridges work?
Most bridges use one of two underlying mechanisms to move value across chains.
Lock-and-mint is the original and still most common model. The asset is locked in a smart contract on the source chain, and an equivalent wrapped token is minted on the destination chain. The wrapped token represents a claim on the locked original. To move back, the wrapped token is burned and the original is released. Wrapped Bitcoin (WBTC) on Ethereum is a well-known example.
Liquidity pool bridging avoids wrapping entirely. Liquidity pools of the same asset exist on both chains, and the bridge swaps from one pool to the other directly. This is generally faster than lock-and-mint and avoids the risks tied to wrapped assets, though it depends on sufficient liquidity being available on both sides.
For stablecoins specifically, a newer model has emerged that avoids both approaches. Circle's Cross-Chain Transfer Protocol (CCTP) burns USDC on the source chain and mints native USDC directly on the destination chain, verified by Circle's attestation service. No wrapped token is created at any point, which removes an entire category of bridge risk.
What are the types of cross-chain bridges?
Bridges differ in who controls the process and how much trust is required.
- Trusted (custodial) bridges: A centralized entity holds the locked funds and manages the minting process on the destination chain. Faster and simpler, but it introduces a single point of failure and counterparty risk
- Trustless (decentralized) bridges: Smart contracts and a network of validators manage the process without a central custodian. More resilient to a single point of failure, but typically slower and more complex to audit
- Federated bridges: A small, defined group of validators jointly manage the bridge. A middle ground between trusted and trustless models, often used in enterprise or permissioned settings
Native or canonical bridges, built and maintained by the blockchain team itself (such as the official Arbitrum Bridge), are generally considered the most secure option for moving assets to and from that specific chain. Third-party bridges built by independent teams, such as Wormhole or Stargate, support many chains at once but add an additional layer of smart contract risk.
What is the difference between a bridge and stablecoin orchestration?
A bridge is a single mechanism for moving an asset between two chains. Stablecoin orchestration is the broader infrastructure layer that decides whether, when, and how to move value across chains as part of a complete payment flow.
An orchestration platform might use a bridge as one tool among several, alongside native issuance and burn protocols like CCTP, liquidity routing across multiple chains, and fiat on-ramps and off-ramps. Bridges solve a narrow technical problem. Orchestration solves the end-to-end business problem of moving money reliably from a payer to a payee, of which bridging is sometimes one component.
Why are cross-chain bridges considered high risk?
Bridges have historically been among the most exploited targets in crypto. Because a lock-and-mint bridge concentrates large amounts of locked value in a single smart contract, it becomes a high-value target for attackers.
Major bridge exploits have resulted in some of the largest losses in crypto history, including the Ronin Bridge hack ($625 million, March 2022) and the Wormhole exploit ($325 million, February 2022). The common failure pattern is a compromised validator set, a smart contract vulnerability, or a flaw in the verification logic that allows an attacker to mint wrapped assets without a corresponding lock.
This risk profile is a major reason native, audited mechanisms like CCTP have gained adoption for stablecoin movement specifically. Removing the wrapped-asset step removes the attack surface that has caused the largest bridge losses to date.
Cross-chain bridges and payment infrastructure
For platforms moving stablecoins across multiple chains as part of a payment flow, bridge selection is a direct risk management decision, not just a technical implementation detail.
Using a native burn-and-mint mechanism where available, rather than a third-party wrapped-asset bridge, removes a significant category of smart contract and custodial risk from the flow of funds.
Where a bridge is unavoidable, evaluating its trust model, audit history, and total value locked relative to its security track record is part of standard due diligence before routing customer funds through it.
