Editing Nomos/Requirements (section)

=== 4.5 Cross-Zone Communication ===

Description: The system MUST provide secure and private cross-zone communication through two complementary mechanisms:

* Trust-minimized bridging through the Coordination Layer for verifiable state transitions
* Direct message passing between zones with Base Layer fallback for data availability

Functional Requirements:

CZC-001: Trust-Minimized Bridging
* The system MUST implement bridging through Coordination Layer:
** Zero-knowledge state transition verification
** Cross-zone transaction atomicity
** State commitment verification
** Bridge security guarantees
** Atomic intent execution
* The system SHOULD support bridge evolution:
** Multi-zone atomic operations
** Optimized proof generation
** Enhanced bridge security
** Efficient state verification
** Advanced bridging protocols

CZC-002: Message Passing Protocol
* The system MUST enable direct zone communication:
** Reliable message delivery guarantees
** Base Layer fallback mechanisms
** Message ordering preservation
** Communication failure recovery
** State synchronization protocols
* The system SHOULD enhance messaging capabilities:
** Optimized message routing
** Advanced failure detection
** Efficient state synchronization
** Resource-aware communication
** Dynamic routing optimization

CZC-003: Privacy Preservation
* The system MUST protect cross-zone privacy:
** Transaction source/destination hiding
** State transition confidentiality
** Relationship metadata protection
** Communication pattern obfuscation
** Intent privacy preservation
* The system SHOULD implement privacy enhancements:
** Zero-knowledge message passing
** Enhanced metadata protection
** Advanced pattern hiding
** Cross-zone anonymity sets
** Relationship hiding protocols

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