docs: fix blockchain RPC port references and dead links

- Update blockchain RPC port from 8081 to 9080 across infrastructure docs
- Fix confidential transactions documentation cross-references
- Standardize "Blockchain Node RPC" naming in services table

docs/5_reference/4_confidential-transactions.md

@@ -173,10 +173,10 @@ Successfully implemented a comprehensive confidential transaction system for AIT
 
 ## Documentation
 
-- [Architecture Design](confidential-transactions.md)
+- [Architecture Design](./4_confidential-transactions.md)
 - [API Documentation](../6_architecture/3_coordinator-api.md)
-- [Security Guide](security-guidelines.md)
-- [Compliance Matrix](compliance-matrix.md)
+- [Security Guide](../9_security/1_security-cleanup-guide.md)
+- [Compliance Matrix](./compliance-matrix.md)
 
 ## Conclusion
 

docs/5_reference/compliance-matrix.md

@@ -0,0 +1,37 @@
+# Compliance Matrix
+
+> **Status**: Planned - Documentation pending
+
+This document will contain the compliance matrix for AITBC, covering:
+
+## Planned Sections
+
+- **Regulatory Compliance**
+  - GDPR compliance checklist
+  - Data protection requirements
+  - Privacy regulations by jurisdiction
+
+- **Security Standards**
+  - ISO 27001 alignment
+  - SOC 2 Type II requirements
+  - Security controls mapping
+
+- **Financial Regulations**
+  - AML/KYC requirements
+  - Payment services directive compliance
+  - Cross-border transaction regulations
+
+- **Industry Standards**
+  - Blockchain compliance frameworks
+  - DeFi regulatory guidelines
+  - AI/ML governance requirements
+
+## Implementation Status
+
+This compliance matrix is currently under development and will be populated as the AITBC platform progresses through compliance audits and regulatory reviews.
+
+---
+
+**Last Updated**: 2026-02-17  
+**Next Review**: TBD  
+**Owner**: Compliance Team