diff --git a/lib/covenants/rules.js b/lib/covenants/rules.js
index dbb763d9..f7e535bb 100644
--- a/lib/covenants/rules.js
+++ b/lib/covenants/rules.js
@@ -396,8 +396,10 @@ rules.isReserved = function isReserved(nameHash, height, network) {
   assert((height >>> 0) === height);
   assert(network && network.names);
 
-  if (network.names.noReserved)
+  // Lethean: second-level TLD, no ICANN collision protection needed
+  if (network.names.noReserved) {
     return false;
+  }
 
   if (height >= network.names.claimPeriod)
     return false;
diff --git a/lib/protocol/genesis-lethean.js b/lib/protocol/genesis-lethean.js
new file mode 100644
index 00000000..f7aa61ff
--- /dev/null
+++ b/lib/protocol/genesis-lethean.js
@@ -0,0 +1,41 @@
+/*!
+ * genesis-lethean.js - ITNS sidechain genesis block
+ *
+ * The genesis block contains:
+ *   - No premine (trust is earned, not granted)
+ *   - No airdrop claims (identity via main chain aliases)
+ *   - Timestamp set to Lethean CIC incorporation date
+ *
+ * To generate the actual genesis block, run:
+ *   node scripts/gen-genesis.js --network=lethean
+ */
+
+'use strict';
+
+const genesis = {};
+
+// Lethean CIC incorporation as the genesis timestamp
+// This anchors the sidechain to the legal entity
+genesis.GENESIS_TIME = 1577836800; // 2020-01-01 00:00:00 UTC (placeholder — use actual CIC date)
+
+// Genesis reward: 0 ITNS
+// No premine. Every ITNS is earned by running infrastructure.
+genesis.GENESIS_REWARD = 0;
+
+// Genesis message — encoded in the coinbase
+genesis.GENESIS_MSG = 'Lethean ITNS sidechain — trust is earned, not granted';
+
+// Network magic bytes (unique to ITNS sidechain)
+genesis.main = {
+  magic: 0x4c544e53, // "LTNS" in hex (L=4c T=54 N=4e S=53)
+};
+
+genesis.testnet = {
+  magic: 0x544e5354, // "TNST"
+};
+
+genesis.regtest = {
+  magic: 0x52475354, // "RGST"
+};
+
+module.exports = genesis;
diff --git a/lib/protocol/lethean.js b/lib/protocol/lethean.js
new file mode 100644
index 00000000..2cd2238b
--- /dev/null
+++ b/lib/protocol/lethean.js
@@ -0,0 +1,101 @@
+/*!
+ * lethean.js - ITNS sidechain parameter overrides for Lethean network
+ *
+ * Token: ITNS (IntenseCoin) — named after Lethean's original identity
+ *
+ * Economics:
+ *   - Tiny block rewards (atomic scale)
+ *   - Round numbers exchangeable 1:1 with LTHN
+ *   - Dust = trust earned from serving the network
+ *
+ * Performance Tiers (by accumulated dust):
+ *   Valiant  (1M+)   — Datacenter/regional peering (named for Lethean's original lead dev)
+ *   Intense  (100K+)  — Dedicated server operator (named for IntenseCoin)
+ *   Pioneer  (10K+)   — Home server / VPS operator
+ *   Relay    (1K+)    — Lightweight relay node
+ *   Seed     (1+)     — New gateway
+ */
+
+'use strict';
+
+const consensus = require('./consensus');
+
+/**
+ * ITNS sidechain overrides
+ * Apply these to consensus exports to create the Lethean network parameters
+ */
+
+const lethean = {
+  // Match LTHN's 12 decimal places for dust precision
+  EXP: 12,
+  COIN: Math.pow(10, 12),
+
+  // Tiny block reward — forces long-term commitment
+  // 0.000001 ITNS per block = need ~348 days solo to earn 1 exchangeable ITNS
+  // A datacenter region (100 nodes) earns 1 ITNS every ~3.5 days
+  BASE_REWARD: 1000000, // 0.000001 * 10^12
+
+  // Faster blocks for more trust accrual events
+  // 30 second blocks = ~2880 blocks/day
+  // Solo: 0.00288 ITNS/day (exchangeable) + work-based dust (trust)
+  POW_TARGET_SPACING: 30,
+
+  // Work proofs: dust accrues from actual network service
+  // DNS queries served, VPN sessions handled, bandwidth relayed
+  // 1 query = 1 atomic dust unit
+  // A busy gateway: ~1000 queries/block * 2880 blocks = 2.88M dust/day
+  // Pioneer in ~4 days, Intense in ~35 days, Valiant in ~1 year
+
+  // No airdrop, no premine — trust is earned
+  MAX_AIRDROP: 0,
+  MAX_INITIAL: 0,
+
+  // Max supply determined by halving schedule
+  // With 0.001 per block, halving every 170000 blocks (~59 days)
+  // Total supply converges to ~340 ITNS (exchangeable to 340 LTHN)
+  // Plus unlimited dust (trust) in atomic units
+
+  // Naming costs — registering .lthn subnames
+  // Free for alias holders (validated against main chain)
+  MIN_NAME_FEE: 0,
+
+  // Performance tier thresholds (dust units)
+  TIER_SEED: 1,
+  TIER_RELAY: 1000,
+  TIER_PIONEER: 10000,
+  TIER_INTENSE: 100000,
+  TIER_VALIANT: 1000000,
+
+  /**
+   * Get tier name from dust amount
+   * @param {Number} dust - atomic units of trust
+   * @returns {String} tier name
+   */
+  getTier(dust) {
+    if (dust >= lethean.TIER_VALIANT) return 'Valiant';
+    if (dust >= lethean.TIER_INTENSE) return 'Intense';
+    if (dust >= lethean.TIER_PIONEER) return 'Pioneer';
+    if (dust >= lethean.TIER_RELAY) return 'Relay';
+    if (dust >= lethean.TIER_SEED) return 'Seed';
+    return 'None';
+  },
+
+  /**
+   * Split balance into exchangeable value and trust dust
+   * @param {Number} balance - total balance in atomic units
+   * @returns {Object} { exchangeable, dust, tier }
+   */
+  splitBalance(balance) {
+    const coin = lethean.COIN;
+    const exchangeable = Math.floor(balance / coin);
+    const dust = balance % coin;
+    return {
+      exchangeable,           // whole ITNS, exchangeable to LTHN
+      dust,                   // atomic remainder, trust score
+      tier: lethean.getTier(dust),
+      display: `${exchangeable}.${String(dust).padStart(12, '0')} ITNS`,
+    };
+  },
+};
+
+module.exports = lethean;
diff --git a/lib/protocol/networks-lethean.js b/lib/protocol/networks-lethean.js
new file mode 100644
index 00000000..735d2732
--- /dev/null
+++ b/lib/protocol/networks-lethean.js
@@ -0,0 +1,120 @@
+/*!
+ * networks-lethean.js - ITNS sidechain network parameters
+ *
+ * Lethean fork of Handshake — manages the .lthn TLD
+ * Token: ITNS (IntenseCoin)
+ *
+ * Changes from upstream HSD:
+ *   - Seeds point to Lethean infrastructure
+ *   - Ports use Lethean range (12037-12040)
+ *   - Block reward reduced to atomic scale (0.000001 ITNS)
+ *   - Block time 30 seconds (faster trust accrual)
+ *   - No airdrop (identity via main chain aliases)
+ *   - EXP=12 (matches LTHN decimal places)
+ */
+
+'use strict';
+
+/**
+ * Lethean ITNS sidechain network overrides.
+ * Apply these on top of the base HSD network config.
+ */
+
+const lethean = {};
+
+// === Mainnet ===
+
+lethean.main = {
+  type: 'main',
+
+  seeds: [
+    'seed.lthn.io',        // Primary (ClouDNS anycast)
+    'ns5.lthn.io',         // snider-linux (DE)
+    'ns6.lthn.io',         // darbs (AU)
+  ],
+
+  // Lethean HSD ports (avoid collision with main chain 36941-36943)
+  port: 12037,
+  brontidePort: 44807,
+  nsPort: 12038,
+  rsPort: 12039,
+  walletPort: 12040,
+
+  // Block time: 30 seconds (vs HSD's 10 minutes)
+  // More blocks = more trust accrual events
+  pow: {
+    targetSpacing: 30,
+  },
+
+  // Names — .lthn TLD management
+  names: {
+    // No reserved names — this is a second-level TLD, ICANN collision doesn't apply
+    noReserved: true,
+    // Registration is free for main-chain alias holders
+    // Validated via alias-DNS bridge
+    auctionStart: 0,
+    rolloutInterval: 1,
+    // Renewal every ~1 year (1,051,200 blocks at 30s)
+    renewalWindow: 1051200,
+    renewalPeriod: 525600,
+    renewalMaturity: 2880, // ~1 day
+  },
+};
+
+// === Testnet ===
+
+lethean.testnet = {
+  type: 'testnet',
+
+  seeds: [
+    'seed-testnet.lthn.io',
+  ],
+
+  port: 13037,
+  brontidePort: 45807,
+  nsPort: 13038,
+  rsPort: 13039,
+  walletPort: 13040,
+
+  pow: {
+    targetSpacing: 30,
+  },
+
+  names: {
+    noReserved: true,
+    auctionStart: 0,
+    rolloutInterval: 1,
+    renewalWindow: 10080,
+    renewalPeriod: 5040,
+    renewalMaturity: 288,
+  },
+};
+
+// === Regtest (local development) ===
+
+lethean.regtest = {
+  type: 'regtest',
+
+  seeds: [],
+
+  port: 14037,
+  brontidePort: 46807,
+  nsPort: 14038,
+  rsPort: 14039,
+  walletPort: 14040,
+
+  pow: {
+    targetSpacing: 1, // 1 second blocks for testing
+  },
+
+  names: {
+    noReserved: true,
+    auctionStart: 0,
+    rolloutInterval: 1,
+    renewalWindow: 100,
+    renewalPeriod: 50,
+    renewalMaturity: 2,
+  },
+};
+
+module.exports = lethean;
diff --git a/lib/protocol/networks.js b/lib/protocol/networks.js
index cd209ab0..02dda3c2 100644
--- a/lib/protocol/networks.js
+++ b/lib/protocol/networks.js
@@ -872,7 +872,7 @@ regtest.names = {
   transferLockup: 10,
   auctionMaturity: 5 + 10 + 50,
   noRollout: false,
-  noReserved: false
+  noReserved: true
 };
 
 regtest.block = {
diff --git a/lib/wallet/wallet.js b/lib/wallet/wallet.js
index af9e5c60..8cb7468d 100644
--- a/lib/wallet/wallet.js
+++ b/lib/wallet/wallet.js
@@ -1734,8 +1734,10 @@ class Wallet extends EventEmitter {
     const {icannlockup} = this.wdb.options;
 
     // TODO: Handle expired behavior.
-    if (rules.isReserved(nameHash, height, network))
+    // Lethean: skip reserved check for second-level TLD names
+    if (rules.isReserved(nameHash, height, network)) {
       throw new Error(`Name is reserved: ${name}.`);
+    }
 
     if (icannlockup && rules.isLockedUp(nameHash, height, network))
       throw new Error(`Name is locked up: ${name}.`);