Hey devs, curious how you’re approaching cross chain messaging security (and what safeguards you wish existed)

Been digging into how cross chain messaging protocols handle replay protection and integrity guarantees, and it feels like there’s still a gap in best practices across ecosystems.

For folks building on Cosmos / Polkadot / EVM bridges:

• What are your current strategies for defending against replay & MEV-related replay threats?
• Do you use challenge periods, merkle proofs, or something else for finality validation?
• Are there specific libs or frameworks you’d recommend?

Trying to better understand what real builders in the trenches are doing rather than just high-level docs. Appreciate any perspectives or pitfalls you’ve run into.

Looking forward to learning from your approaches!
(no link/share — just sharing experience & asking specific questions)