Editing Nomos/Requirements (section)

== 3. External Interface Requirements ==

<span id="user-interfaces"></span>
=== 3.1 User Interfaces ===

The system MUST provide the following interfaces:

# Validator Node Interface
* Command line interface for node operation
* Configuration management interface
* Monitoring and metrics interface
* Key management interface

# Zone Operator Interface
* Zone deployment interface
* Zone management interface
* State transition interface
* Cross-zone communication interface

# Developer Interface
* Zone development SDK
* Smart contract interfaces
* Privacy-preserving computation interfaces
* Cross-zone communication APIs

# Light Node Interface
* Simple setup interface
* Verification interface
* Network coordination interface
* Data availability sampling interface

<span id="hardware-interfaces"></span>
=== 3.2 Hardware Interfaces ===

Base Layer Nodes MUST:
* Support commodity CPU hardware
* Support standard network interfaces
* Support standard storage interfaces
* Support consumer-grade memory

Coordination Layer Nodes MUST:
* Support specialized proof generation hardware
* Support high-bandwidth network interfaces
* Support high-performance storage
* Support sufficient memory for proof generation

Zone Nodes MAY:
* Require specialized hardware
* Support custom networking hardware
* Implement specific storage requirements
* Need high-performance memory

<span id="software-interfaces"></span>
=== 3.3 Software Interfaces ===

The system MUST provide:

# Network Protocol Interfaces
* P2P networking modules, i.e. libp2p-mix (for network privacy)
* Blend Network modules:
** PTM (validator connections and drop messages)
** MBM (consensus message mixing and timing)
** CTM (cover traffic generation)
* Data availability protocols
* Cross-zone communication protocols

# Cryptographic Interfaces
* Zero-knowledge proof systems
* Threshold encryption systems
* Key management systems
* Commitment schemes

# Storage Interfaces
* Data availability storage
* State storage
* Proof storage
* Configuration storage

# Development Interfaces
* Zone development frameworks
* Smart contract languages
* Privacy-preserving computation tools
* Cross-zone communication libraries

<span id="communications-interfaces"></span>
=== 3.4 Communications Interfaces ===

The system MUST implement:

# Network-Level Communication
* Privacy-preserving P2P protocols through libp2p-mix module
* Consensus privacy as Blend Network protocol
* Data availability sampling
* Consensus communication as Cryptarchia

# Cross-Zone Communication
* Trust-minimized bridging
* Message passing protocols
* State verification
* Atomic operations

# Light Node Communication
* Data availability verification
* Proof verification
* Network coordination
* Exit protocols

<span id="system-features"></span>