CCTP V1 vs V2: The Nonce Mismatch That Breaks Cross-Chain Arrival Checks While building a cross-chain transaction tracker on Base, I hit a subtle gotcha in Circle's CCTP (Cross-Chain Transfer Protocol) that took me a while to figure out. If you're building anything that tracks "did my USDC bridg...
Source: [Dev.to](https://dev.to/lake_sky_future/cctp-v1-vs-v2-the-nonce-mismatch-that-breaks-cross-chain-arrival-checks-56l9)