Update supply-chain-rpc-security.mdx

[yuvalava]

Frameworks PR Checklist

Thank you for contributing to the Security Frameworks! Before you open a PR, make sure to read information for contributors and take a look at the following checklist:

• Describe your changes, substitute this text with the information:
• Expands the RPC Provider Compromise section.
• Reframes the risk as availability + integrity, rather than just single-provider failure. The existing text reads primarily as an availability story (Infura). Integrity is a different threat model and worth calling out separately.
• Adds the April 2026 KelpDAO / LayerZero incident as a notable case — audited contracts drained via RPC compromise, no smart contract bug.
• Adds a short tiered ladder of RPC cross-validation defenses (simple quorum → multi-source → risk-aware → failover-tightened) plus a brief mention of cryptographic verification.

No changes outside this section.
cc @scode2277 @ipatka

• If you are touching an existing piece of content, tag current contributors from the attribution list
• If there is a steward for that framework, ask the steward to review it
• [] If you're modifying the general outline, make sure to update it in the vocs.config.ts adding the dev: true parameter
• [] If you need feedback for your content from the wider community, share the PR in our Discord
• Review changes to ensure there are no typos; see instructions below.

[github-actions]

built with Refined Cloudflare Pages Action

⚡ Cloudflare Pages Deployment

Name	Status	Preview	Last Commit
frameworks	✅ Ready (View Log)	Visit Preview	fee8ad6