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== 4. System Features == <span id="base-layer"></span> === 4.1 Base Layer === <span id="private-proof-of-stake"></span> ==== 4.1.1 Private Proof of Stake ==== Description: The Base Layer MUST implement a Private Proof of Stake consensus mechanism that preserves validator privacy and prevents targeted attacks. Functional Requirements: PPOS-001: Validator Privacy * The system MUST implement basic privacy: ** Hide validator stakes through Blend Network ** Preserve block proposer anonymity ** Prevent stake deanonymization attacks ** Maintain validator metadata privacy * The system SHOULD support enhanced privacy: ** Advanced timing analysis protection ** Enhanced anonymity set generation ** Improved network attack resistance PPOS-002: Consensus Security * The system MUST provide basic security: ** Prevent stake grinding attacks ** Ensure fair block production ** Maintain consensus finality ** Handle network partitions * The system SHOULD implement advanced security: ** Quantum attack resistance ** Eclipse attack prevention ** Advanced fork choice rules ** Complex partition handling PPOS-003: Network Resilience * The system MUST ensure basic resilience: ** Support commodity hardware validators ** Handle intermittent connectivity ** Recover from network failures ** Maintain liveness under attack * The system SHOULD provide enhanced resilience: ** Advanced recovery mechanisms ** Dynamic attack mitigation ** Adaptive network topology ** Self-healing capabilities <span id="data-availability"></span> ==== 4.1.2 Data Availability ==== Description: The Base Layer MUST provide scalable data availability with light client verification capabilities. Functional Requirements: DAS-001: Data Sampling and Verification * The system MUST implement basic sampling: ** Efficient data availability sampling ** Light client verification support ** Sample size optimization ** Verification latency targets * The system SHOULD support advanced sampling: ** Adaptive sample sizes ** Enhanced verification methods ** Optimized proof generation ** Advanced fraud proofs DAS-002: Data Organization * The system MUST implement basic sharding: ** Data segmentation and distribution ** Cross-shard verification ** Shard synchronization ** Data redundancy management * The system SHOULD support advanced sharding: ** Dynamic shard allocation ** Cross-shard optimization ** Adaptive redundancy ** Load balancing DAS-003: Data Integrity and Recovery * The system MUST ensure basic integrity: ** Data reconstruction capabilities ** Integrity verification ** Error detection and correction ** Bandwidth optimization * The system SHOULD implement advanced features: ** Advanced reconstruction methods ** Enhanced error correction ** Optimized bandwidth usage ** Proactive integrity checks <span id="network-and-consensus-privacy"></span> ==== 4.1.3 Network and Consensus Privacy ==== Description: The Base Layer MUST implement two complementary privacy systems: * Required for MVP: ** Nomos Blend Network: A specialized privacy system for Private Proof of Stake with three modules: *** PTM (Persistent Transmission Module): Manages validator connections and drop messages *** MBM (Message Blending Module): Processes consensus messages through mixing and timing obfuscation *** CTM (Cover Traffic Module): Generates anonymity sets through cover messages ** libp2p-mix: A P2P networking module for general network privacy * Future Enhancements: ** Advanced timing analysis protection ** Enhanced anonymity set generation ** Improved network attack resistance Functional Requirements: BNP-001: Persistent Transmission Module * The system MUST maintain persistent validator connections with basic privacy: ** Establish and maintain secure validator connections ** Handle drop messages for connection privacy ** Monitor connection quality and health ** Manage connection lifecycles securely * The system SHOULD implement advanced connection features: ** Dynamic connection management based on network conditions ** Enhanced privacy through adaptive drop message rates ** Advanced connection health monitoring and recovery ** Optimized connection resource management BNP-002: Message Blending Module * The system MUST process and blend consensus messages: ** Process consensus messages through mixing ** Implement basic timing analysis protection ** Integrate fully with Cryptarchia protocol ** Maintain message timing obfuscation * The system SHOULD enhance message privacy: ** Advanced timing analysis protection mechanisms ** Enhanced message mixing algorithms ** Complex timing pattern obfuscation ** Optimized message processing and blending BNP-003: Cover Traffic Module * The system MUST generate minimum required cover traffic: ** Generate and maintain cover message streams ** Create sufficient anonymity sets ** Optimize resource usage for cover traffic ** Balance privacy and bandwidth usage * The system SHOULD implement advanced cover traffic: ** Dynamic cover traffic generation based on network activity ** Enhanced anonymity set management ** Advanced traffic pattern obfuscation ** Efficient resource utilization strategies BNP-004: Network Privacy Integration * The system MUST provide network-level privacy: ** Network-level privacy for non-consensus messages ** Basic private P2P communication capabilities ** Private data dissemination mechanisms ** Basic traffic analysis protection * The system SHOULD enhance network privacy: ** Advanced traffic analysis protection ** Optimized cover traffic generation ** Larger anonymity set maintenance ** Improved network attack resistance <span id="coordination-layer"></span> === 4.2 Coordination Layer === <span id="zero-knowledge-verification"></span> ==== 4.2.1 Zero-Knowledge Verification ==== Description: The Coordination Layer MUST provide efficient zero-knowledge proof verification for state transitions and cross-zone communication. Functional Requirements: ZKV-001: Proof Verification Core * The system MUST implement basic verification: ** Efficient ZK proof verification ** Support for multiple proving systems ** Basic proof validity checks ** Verification cost optimization * The system SHOULD support advanced verification: ** Hardware-accelerated verification ** Parallel proof verification ** Advanced validity checks ** Dynamic cost optimization ZKV-002: Proof Aggregation * The system MUST support basic aggregation: ** Proof batching and combining ** Cross-zone proof aggregation ** Aggregation validity checks ** Resource usage optimization * The system SHOULD implement advanced aggregation: ** Dynamic batch sizing ** Multi-layer aggregation ** Complex validity preservation ** Enhanced resource efficiency ZKV-003: System Evolution * The system MUST handle basic updates: ** Proof system upgrades ** Parameter updates ** Backward compatibility ** Version management * The system SHOULD support advanced features: ** Zero-downtime upgrades ** Seamless version transitions ** Cross-version compatibility ** Update verification guarantees <span id="intent-solving"></span> ==== 4.2.2 Intent Solving ==== Description: The Coordination Layer MUST provide private intent matching and solving capabilities that preserve user privacy while enabling efficient cross-zone transaction processing. Functional Requirements: ISM-001: Intent Matching Core * The system MUST implement basic matching: ** Match compatible intents efficiently ** Ensure atomic execution across zones ** Handle partial transactions ** Support different intent types * The system SHOULD support advanced matching: ** Dynamic matching optimization ** Complex intent compatibility rules ** Multi-party intent matching ** Resource-aware matching ISM-002: Intent Privacy * The system SHOULD provide basic privacy: ** Basic intent privacy during matching ** Simple relationship hiding ** Minimal information disclosure ** Privacy-preserving validation * The system SHOULD implement enhanced privacy: ** Advanced intent obfuscation ** Complex relationship hiding ** Zero-knowledge intent matching ** Privacy-preserving optimization ISM-003: Cross-Zone Coordination * The system MUST enable basic coordination: ** Cross-zone atomic execution ** Basic state synchronization ** Intent propagation ** Failure handling * The system SHOULD support advanced features: ** Complex atomic operations ** Advanced state management ** Optimized propagation ** Comprehensive failure recovery <span id="zones"></span> === 4.3 Zones === <span id="execution-environments"></span> ==== 4.3.1 Execution Environments ==== Description: Zones MUST provide flexible and sovereign execution environments with configurable security and performance characteristics. Functional Requirements: ZEE-001: Virtual Machine Support * The system MUST provide support VM capabilities * The system SHOULD enable VM extensibility: ** Zero-knowledge virtual machine integration ** Multi-party computation environments ** Hardware-accelerated execution environments ** Domain-specific VM optimization ZEE-002: Consensus and State Management * The system MUST enable sovereign execution: ** Independent consensus mechanism selection ** State transition rule customization ** Cross-zone state verification ** State sovereignty preservation * The system SHOULD support execution evolution: ** Consensus mechanism upgrades ** State transition rule modifications ** Cross-zone state synchronization ** State recovery mechanisms ZEE-003: Privacy and Scalability * The system MUST implement execution privacy: ** Private state transitions ** Confidential smart contracts ** Selective state disclosure ** Private cross-zone interactions * The system SHOULD enable execution scaling: ** Parallel transaction processing ** State sharding capabilities ** Cross-zone execution optimization ** Resource utilization management <span id="network-privacy"></span> ==== 4.4 Network Privacy ==== Description: The system MUST implement comprehensive network-level privacy through libp2p-mix and Blend Network protocols to prevent traffic analysis and protect validator identities. Functional Requirements: NWP-001: Network Communication Privacy * The system MUST implement private P2P communication: ** Encrypted peer connections through libp2p-mix ** Private peer discovery mechanisms ** Network topology obfuscation ** Traffic pattern hiding * The system SHOULD enhance network privacy: ** Dynamic peer selection strategies ** Advanced routing algorithms ** Network partition resistance ** Topology optimization NWP-002: Traffic Analysis Protection * The system MUST prevent traffic analysis: ** Message size normalization ** Timing pattern obfuscation ** Flow correlation prevention ** Cover traffic integration * The system SHOULD implement enhanced protections: ** Adaptive traffic shaping ** Dynamic cover traffic generation ** Advanced timing obfuscation ** Flow fingerprint resistance NWP-003: Network Resilience * The system MUST provide network resilience: ** Peer connection redundancy ** Network attack resistance ** Failure recovery mechanisms ** Byzantine fault tolerance * The system SHOULD enable advanced resilience: ** Self-healing network topology ** Dynamic route optimization ** Attack mitigation strategies ** Automated recovery procedures <span id="cross-zone-communication"></span> === 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 <span id="light-node-network"></span> === 4.6 Light Node Network === Description: The Light Node Network MUST provide efficient verification capabilities while minimizing resource requirements, enabling users to validate the network’s integrity without running full nodes. Functional Requirements: LNV-001: Data Availability Verification * The system MUST enable light client verification: ** Data availability sampling verification ** Fraud proof validation ** Sample size management ** Bandwidth-efficient verification ** Resource usage optimization * The system SHOULD support verification enhancements: ** Adaptive sampling strategies ** Optimized proof validation ** Enhanced fraud detection ** Network-aware sampling ** Dynamic sample size adjustment LNV-002: Zero-Knowledge Proof Validation * The system MUST support proof verification: ** Zone state transition validation ** Cross-zone communication verification ** Selective proof verification ** Resource-efficient validation ** Proof aggregation verification * The system SHOULD enable advanced validation: ** Parallel proof verification ** Proof aggregation validation ** Optimized verification paths ** Hardware acceleration support ** Batched proof verification LNV-003: Network Security * The system MUST provide security features: ** Secure network exit protocol implementation ** Verifiable data reconstruction mechanisms ** Decentralized coordination protocol ** Byzantine fault detection ** Network partition handling * The system SHOULD enable advanced security: ** Automated exit coordination ** Enhanced data reconstruction ** Advanced fault detection ** Network attack resistance ** Self-healing mechanisms <span id="other-nonfunctional-requirements"></span>
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