wifi-densepose/examples/edge-net/docs/research/ECONOMIC_EDGE_CASE_ANALYSIS.md

Economic Edge Case Analysis for edge-net

Executive Summary

This document provides a comprehensive analysis of the edge-net economic system, identifying test coverage gaps and proposing new edge case tests across four core modules:

1. credits/mod.rs - Credit ledger with CRDT and contribution curve
2. evolution/mod.rs - Economic engine with distribution ratios
3. tribute/mod.rs - Founding registry with vesting schedules
4. rac/economics.rs - RAC staking, reputation, and rewards

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Current Test Coverage Analysis

1. credits/mod.rs - Credit Ledger

Existing Tests:

• Basic contribution curve multiplier calculations
• Ledger operations (credit, deduct, stake - WASM only)
• Basic staking operations (WASM only)

Coverage Gaps Identified:

Gap	Severity	Description
Credit Overflow	HIGH	No test for calculate_reward when base_reward * multiplier approaches u64::MAX
Negative Network Compute	MEDIUM	current_multiplier(-x) produces exp(x/constant) which explodes
CRDT Merge Conflicts	HIGH	No test for merge producing negative effective balance
Zero Division	MEDIUM	No test for zero denominators in ratio calculations
Staking Edge Cases	MEDIUM	No test for staking exactly balance, or stake-deduct race conditions

2. evolution/mod.rs - Economic Engine

Existing Tests:

• Basic reward processing
• Evolution engine replication check
• Optimization node selection (basic)

Coverage Gaps Identified:

Gap	Severity	Description
Treasury Depletion	HIGH	No test for treasury running out of funds
Distribution Ratio Sum	HIGH	No verification that ratios exactly sum to 1.0
Founder Share Remainder	MEDIUM	Founder share is computed as total - others - rounding not tested
Sustainability Thresholds	MEDIUM	No test at exact threshold boundaries
Velocity Calculation	LOW	health.velocity uses magic constant 0.99 - not tested
Stability Edge Cases	MEDIUM	Division by zero when total_pools == 0 handled but not tested

3. tribute/mod.rs - Founding Registry

Existing Tests:

• Basic founding registry creation
• Contribution stream processing
• Vesting schedule before/after cliff

Coverage Gaps Identified:

Gap	Severity	Description
Weight Clamping	HIGH	clamp(0.01, 0.5) not tested at boundaries
Epoch Overflow	MEDIUM	No test for epoch values near u64::MAX
Multiple Founders	MEDIUM	No test for total weight > 1.0 scenario
Genesis Sunset	HIGH	No test for full 4-year vesting completion
Pool Balance Zero	MEDIUM	calculate_vested(epoch, 0) returns 0 but division not tested

4. rac/economics.rs - RAC Economics

Existing Tests:

• Stake manager basic operations
• Reputation decay calculation
• Reward vesting and clawback
• Economic engine combined operations
• Slashing by reason

Coverage Gaps Identified:

Gap	Severity	Description
Slash Saturation	HIGH	Multiple slashes exceeding stake not thoroughly tested
Reputation Infinity	MEDIUM	effective_score with 0 interval causes division
Concurrent Access	HIGH	RwLock contention under load not tested
Reward ID Collision	LOW	SHA256 collision probability not addressed
Challenge Gaming	HIGH	Winner/loser both being same node not tested
Zero Stake Operations	MEDIUM	Unstake/slash on zero-stake node edge cases

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Proposed Edge Case Tests

Section 1: Credit Overflow/Underflow

#[test]
fn test_credit_near_max_u64() {
    // base_reward near u64::MAX with 10x multiplier
    let max_safe = u64::MAX / 20;
    let reward = ContributionCurve::calculate_reward(max_safe, 0.0);
    assert!(reward <= u64::MAX);
}

#[test]
fn test_negative_network_compute() {
    let mult = ContributionCurve::current_multiplier(-1_000_000.0);
    assert!(mult.is_finite());
    // exp(1) = 2.718, so mult = 1 + 9 * e = 25.4 (unsafe?)
}

Section 2: Multiplier Manipulation

#[test]
fn test_multiplier_inflation_attack() {
    // Attacker rapidly inflates network_compute to reduce
    // legitimate early adopter multipliers
    let decay_rate = compute_decay_per_hour(100_000.0);
    assert!(decay_rate < 0.15); // <15% loss per 100k hours
}

Section 3: Economic Collapse Scenarios

#[test]
fn test_sustainability_exact_threshold() {
    let mut engine = EconomicEngine::new();
    // Fill treasury to exactly 90 days runway
    for _ in 0..optimal_reward_count {
        engine.process_reward(100, 1.0);
    }
    assert!(engine.is_self_sustaining(100, 1000));
}

#[test]
fn test_death_spiral() {
    // Low activity -> low rewards -> nodes leave -> lower activity
    let mut engine = EconomicEngine::new();
    // Simulate declining node count
    for nodes in (10..100).rev() {
        let sustainable = engine.is_self_sustaining(nodes, nodes * 10);
        // Track when sustainability is lost
    }
}

Section 4: Free-Rider Exploitation

#[test]
fn test_reward_without_stake() {
    // Verify compute rewards require minimum stake
    let stakes = StakeManager::new(100);
    let node = [1u8; 32];

    // Attempt to earn without staking
    assert!(!stakes.has_sufficient_stake(&node));
    // Economic engine should reject reward
}

#[test]
fn test_sybil_cost_barrier() {
    // Verify 100 sybil nodes costs 100 * min_stake
    let stakes = StakeManager::new(100);
    let sybil_cost = 100 * 100;
    assert_eq!(stakes.total_staked(), sybil_cost);
}

Section 5: Contribution Gaming

#[test]
fn test_founder_weight_overflow() {
    let mut registry = FoundingRegistry::new();

    // Register 10 founders each claiming 50% weight
    for i in 0..10 {
        registry.register_contributor(&format!("f{}", i), "architect", 0.5);
    }

    // Total weight should not exceed allocation
    let total_vested = registry.calculate_vested(365 * 4, 1_000_000);
    assert_eq!(total_vested, 50_000); // 5% cap enforced
}

#[test]
fn test_contribution_stream_drain() {
    let mut stream = ContributionStream::new();

    // Fee shares: 10% + 5% + 2% = 17%
    // Remaining: 83%
    let remaining = stream.process_fees(10000, 1);
    assert_eq!(remaining, 8300);
}

Section 6: Treasury Depletion

#[test]
fn test_treasury_runway_calculation() {
    let engine = EconomicEngine::new();

    // 100 nodes * 10 rUv/day * 90 days = 90,000 rUv needed
    let required = 100 * 10 * 90;

    // Process rewards to fill treasury
    // Treasury gets 15% of each reward
    // Need: 90,000 / 0.15 = 600,000 total rewards
}

Section 7: Genesis Sunset Edge Cases

#[test]
fn test_vesting_cliff_exact_boundary() {
    let registry = FoundingRegistry::new();

    let cliff_epoch = (365 * 4) / 10; // 10% of 4 years

    let at_cliff_minus_1 = registry.calculate_vested(cliff_epoch - 1, 1_000_000);
    let at_cliff = registry.calculate_vested(cliff_epoch, 1_000_000);

    assert_eq!(at_cliff_minus_1, 0);
    assert!(at_cliff > 0);
}

#[test]
fn test_full_vesting_at_4_years() {
    let registry = FoundingRegistry::new();

    // Full 4-year vest
    let full = registry.calculate_vested(365 * 4, 1_000_000);
    assert_eq!(full, 50_000); // 5% of 1M

    // Beyond 4 years should not exceed
    let beyond = registry.calculate_vested(365 * 5, 1_000_000);
    assert_eq!(beyond, 50_000);
}

Section 8: RAC Economic Attacks

#[test]
fn test_slash_cascade_attack() {
    let manager = StakeManager::new(100);
    let victim = [1u8; 32];

    manager.stake(victim, 1000, 0);

    // Cascade: Equivocation + Sybil = 50% + 100% of remainder
    manager.slash(&victim, SlashReason::Equivocation, vec![]);
    manager.slash(&victim, SlashReason::SybilAttack, vec![]);

    assert_eq!(manager.get_stake(&victim), 0);
}

#[test]
fn test_reputation_negative_protection() {
    let manager = ReputationManager::new(0.1, 86400_000);
    let node = [1u8; 32];

    manager.register(node);

    // Massive failure count
    for _ in 0..1000 {
        manager.record_failure(&node, 1.0);
    }

    let rep = manager.get_reputation(&node);
    assert!(rep >= 0.0, "Reputation should never go negative");
}

---

Priority Matrix

Priority	Tests	Rationale
P0 (Critical)	Credit overflow, Distribution ratio sum, Slash saturation, CRDT merge conflicts	Could cause token inflation or fund loss
P1 (High)	Treasury depletion, Sybil cost, Vesting cliff, Free-rider protection	Economic sustainability attacks
P2 (Medium)	Multiplier manipulation, Founder weight clamping, Reputation bounds	Gaming prevention
P3 (Low)	Velocity calculation, Mutation rate decay, Unknown node scoring	Minor edge cases

---

Implementation Status

Tests have been implemented in:

• /workspaces/ruvector/examples/edge-net/tests/economic_edge_cases_test.rs

To run the tests:

cd /workspaces/ruvector/examples/edge-net
cargo test --test economic_edge_cases_test

---

Recommendations

1. Immediate Actions:

   • Add overflow protection with checked_mul in calculate_reward
   • Validate network_compute is non-negative before multiplier calculation
   • Add explicit tests for CRDT merge conflict resolution

2. Short-term:

   • Implement minimum stake enforcement in compute reward path
   • Add comprehensive vesting schedule tests at all boundaries
   • Create stress tests for concurrent stake/slash operations

3. Long-term:

   • Consider formal verification for critical economic invariants
   • Add fuzzing tests for numeric edge cases
   • Implement economic simulation tests for collapse scenarios