OFAC compliance for blockchain bridges

Blockchain bridges must screen both source and destination addresses before locking or releasing assets across chains.

TL;DR

TL;DR: A bridge must check both the source address and the destination address against the SDN List before moving assets, because facilitating a sanctioned transfer creates exposure.

Why bridges carry exposure

A bridge moves value between chains, and the operator is the control point. If a bridge helps a designated wallet move funds, the operator faces facilitation exposure even without intent, because OFAC applies strict liability. A bridge is a prime target because it lets a sanctioned party hop chains to evade a block on one network.

Screen both ends

• Source: check the address locking assets on the origin chain.
• Destination: check the address receiving assets on the target chain.
• Ownership: apply the 50 Percent Rule to majority owned entities.

Controls

Run the check before the bridge locks or mints. A screening API under 100 ms keeps bridging fast. Log every screen, and block the transaction when either address matches a listed crypto wallet or SDN name. Update the list hourly so new designations are caught the moment they publish.

The chain-hop risk

A designated party often uses a bridge to move value to a chain where its address is less watched. That is why both ends matter: blocking the source is pointless if the destination is not also checked. Screen the pair together, and refuse the transfer if either end matches, or the bridge becomes the tool for the exact evasion it was meant to prevent.