Implement blockchain oracle applications for external proof data**

[jobbykings]

Create advanced blockchain oracle applications for external proof data, real-world data verification, and cross-chain oracle networks.

Requirements:
Blockchain oracle application implementation
External proof data integration
Real-world data verification
Cross-chain oracle networks
Oracle security verification
Data reliability optimization

Acceptance Criteria:
GIVEN oracle application, WHEN used, THEN external data is reliably integrated
GIVEN proof data, WHEN verified, THEN real-world authenticity is confirmed
GIVEN cross-chain network, WHEN active, THEN data flows between blockchains securely
GIVEN security verification, WHEN performed, THEN oracle properties are cryptographically sound
GIVEN reliability optimization, WHEN applied, THEN oracle data is trustworthy

Files to Work On:

Backend:

backend/src/oracleapplications/OracleApplications.ts (new)
backend/src/oracleapplications/ExternalDataIntegrator.ts (new)
backend/src/oracleapplications/RealWorldVerifier.ts (new)
backend/src/oracleapplications/CrossChainNetwork.ts (new)
backend/src/services/OracleApplicationService.ts (new)

Frontend:

frontend/src/components/OracleApplications/DataIntegration.tsx (new)
frontend/src/components/OracleApplications/RealWorldVerification.tsx (new)