Stablecoin cross-chain usage indeed faces protocol security challenges. Interoperability between blockchains relies on complex bridge protocols, which are prime targets for exploits, such as hacks or double-spending attacks. Vulnerabilities in smart contracts or consensus mechanisms can compromise asset integrity during transfers. Additionally, differing security models across chains increase risks of mismatches or failures in validation. Custodial bridges may introduce centralization risks, while non-custodial ones often struggle with liquidity or latency issues, amplifying attack vectors. Ensuring robust cryptographic proofs and decentralized oracles is critical but challenging. Regular audits and stress-testing of cross-chain protocols are essential to mitigate these risks, yet no solution is foolproof.