+==============================================================================+
|                           LUX NETWORK ARCHITECTURE                           |
+==============================================================================+
|                                                                               |
|   PRIMARY CHAINS (L1)                                                         |
|   +------------+  +------------+  +------------+  +------------+              |
|   |  D-Chain   |  |  C-Chain   |  |  X-Chain   |  |  Q-Chain   |              |
|   | Platform   |  |    EVM     |  | Exchange   |  | Quantum    |              |
|   +-----+------+  +-----+------+  +-----+------+  +-----+------+              |
|         |               |               |               |                     |
|         +-------+-------+-------+-------+-------+-------+                     |
|                 |               |               |                             |
|            Shared Consensus & Finality (Lux FPC)                              |
|                 |               |               |                             |
|         +-------+-------+-------+-------+-------+-------+                     |
|         |               |               |               |                     |
|   +-----v------+  +-----v------+  +-----v------+  +-----v------+              |
|   |  B-Chain   |  |  T-Chain   |  |  LX Chain  |  | Future L2s |              |
|   |  Bridge    |  | Threshold  |  |    DEX     |  |    ...     |              |
|   +------------+  +------------+  +------------+  +------------+              |
|                                                                               |
|   LAYER 2 CHAINS (Subnets)                                                    |
+==============================================================================+

// ValidatorConfig for LX subnet
type ValidatorConfig struct {
    // D-Chain staking
    StakeAmount     *big.Int  // Minimum LUX stake
    StakeDuration   time.Duration
    DelegationFee   uint32    // Fee for delegators (basis points)

    // LX subnet specific
    SubnetID        [32]byte  // LX subnet identifier
    NodeID          string    // Validator node ID
    BLSPublicKey    []byte    // For consensus participation

    // DEX node requirements
    MatchingBackend Backend   // Go/CGO/MLX/CUDA
    MinMemory       uint64    // 16GB minimum
    MinCPUCores     int       // 8 cores minimum
}

+====================================+
|        LX VALIDATOR NODE           |
+====================================+
|                                    |
|  +------------------------------+  |
|  |  D-Chain Validator Module    |  |
|  |  - Stake management          |  |
|  |  - Subnet participation      |  |
|  |  - Reward distribution       |  |
|  +------------------------------+  |
|              |                     |
|              v                     |
|  +------------------------------+  |
|  |  LX DEX Engine (lxd)         |  |
|  |  - Order matching            |  |
|  |  - Market data               |  |
|  |  - Settlement batching       |  |
|  +------------------------------+  |
|              |                     |
|              v                     |
|  +------------------------------+  |
|  |  Consensus Participation     |  |
|  |  - DAG vertex creation       |  |
|  |  - Vote casting (FPC)        |  |
|  |  - Certificate generation    |  |
|  +------------------------------+  |
|                                    |
+====================================+

// LuxFPC implements shared consensus
type LuxFPC struct {
    // Network-wide parameters (inherited from Lux)
    NetworkID     uint32
    ValidatorSet  *ValidatorSet  // Shared with D-Chain

    // LX-specific configuration
    SubnetID      [32]byte
    ThetaMin      float64  // 0.55 - minimum vote threshold
    ThetaMax      float64  // 0.65 - maximum vote threshold
    RoundDuration time.Duration  // 50ms

    // Quantum-safe extensions
    BLSAggregator *BLSAggregator
    RingtailSigner *RingtailSigner
}

// ProcessVertex handles new order vertices
func (fpc *LuxFPC) ProcessVertex(ctx context.Context, v *OrderVertex) error {
    // 1. Validate vertex structure
    if err := v.Validate(); err != nil {
        return fmt.Errorf("invalid vertex: %w", err)
    }

    // 2. Check parent vertices are finalized
    for _, parentID := range v.Parents {
        if !fpc.IsFinalized(parentID) {
            return ErrParentNotFinalized
        }
    }

    // 3. Add to local DAG
    fpc.dag.AddVertex(v)

    // 4. Begin voting rounds
    return fpc.initiateVoting(ctx, v.ID)
}

LX Order → DAG Vertex → FPC Voting → Certificate → Settlement → Lux Finality

Timeline:
0ms      - Order received
1ms      - DAG vertex created
50ms     - First voting round complete
100ms    - Certificate generated (if consensus reached)
150ms    - Settlement batch sent to C-Chain
200ms    - Full Lux network finality

// BridgeClient handles cross-chain operations
type BridgeClient struct {
    bChainRPC   string
    lxChainID   [32]byte

    // Asset mappings
    wrappedAssets map[[32]byte]WrappedAsset
}

// DepositFromExternal bridges assets to LX for trading
func (bc *BridgeClient) DepositFromExternal(
    ctx context.Context,
    sourceChain string,  // "ethereum", "bitcoin", etc.
    asset string,
    amount *big.Int,
    recipient [20]byte,
) (*DepositReceipt, error) {
    // 1. Lock on source chain (via B-Chain bridge)
    lockTx, err := bc.lockOnSource(ctx, sourceChain, asset, amount)
    if err != nil {
        return nil, fmt.Errorf("lock failed: %w", err)
    }

    // 2. Wait for B-Chain confirmation
    proof, err := bc.waitForBridgeProof(ctx, lockTx)
    if err != nil {
        return nil, fmt.Errorf("bridge proof failed: %w", err)
    }

    // 3. Mint wrapped asset on LX
    return bc.mintOnLX(ctx, proof, recipient)
}

// SettlementContract interface for C-Chain
type SettlementContract struct {
    address     common.Address
    cChainRPC   string
    signer      *ecdsa.PrivateKey
}

// BatchSettle commits trade settlements to C-Chain
func (sc *SettlementContract) BatchSettle(
    ctx context.Context,
    settlements []*Settlement,
) (*types.Receipt, error) {
    // Encode settlement batch
    data, err := sc.encodeSettlements(settlements)
    if err != nil {
        return nil, err
    }

    // Submit to C-Chain
    tx := types.NewTransaction(
        sc.nonce,
        sc.address,
        big.NewInt(0),
        sc.gasLimit,
        sc.gasPrice,
        data,
    )

    signedTx, err := types.SignTx(tx, types.NewEIP155Signer(sc.chainID), sc.signer)
    if err != nil {
        return nil, err
    }

    return sc.client.SendTransaction(ctx, signedTx)
}

// WarpMessage for cross-chain settlement
type WarpMessage struct {
    // Standard Warp fields
    NetworkID     uint32
    SourceChainID [32]byte  // LX chain ID
    DestChainID   [32]byte  // Target chain (C-Chain, etc.)

    // Payload
    MessageType   WarpMessageType
    Payload       []byte

    // Signatures (threshold required)
    BLSSignature  []byte    // Aggregated BLS signature
    RTSignature   []byte    // Post-quantum Ringtail signature
    SignerBitmap  []byte    // Which validators signed
}

const (
    WarpSettlement    WarpMessageType = iota + 1
    WarpWithdrawal
    WarpDeposit
    WarpLiquidation
    WarpOracleUpdate
)

// Daemon represents the lxd node
type Daemon struct {
    // Core components
    engine     *TradingEngine
    consensus  *LuxFPC
    gateway    *Gateway

    // Lux network integration
    dChainClient *DChainClient  // Staking, validator set
    cChainClient *CChainClient  // Settlement contracts
    bChainClient *BridgeClient  // Cross-chain bridges
    warpClient   *WarpClient    // Warp messaging

    // Configuration
    config     *Config
    nodeID     string
    subnetID   [32]byte

    // Lifecycle
    ctx        context.Context
    cancel     context.CancelFunc
}

1. INITIALIZATION
   +-> Load configuration
   +-> Initialize cryptographic keys (Ed25519, BLS, Ringtail)
   +-> Verify D-Chain stake is active

2. LUX NETWORK CONNECTION
   +-> Connect to D-Chain (validator set sync)
   +-> Connect to C-Chain (settlement contract)
   +-> Connect to B-Chain (bridge status)
   +-> Initialize Warp client

3. LX SUBNET BOOTSTRAP
   +-> Join LX subnet validator set
   +-> Sync DAG state from peers
   +-> Initialize trading engine
   +-> Start consensus participation

4. GATEWAY ACTIVATION
   +-> Bind gRPC server
   +-> Bind WebSocket server
   +-> Accept client connections
   +-> Begin order processing

lxd Process Memory (~2GB typical)
+================================+
|  Order Pool         256MB      |  <- Pre-allocated order objects
+--------------------------------+
|  Order Books        512MB      |  <- Per-symbol B-trees
+--------------------------------+
|  Trade Buffer       128MB      |  <- Circular trade history
+--------------------------------+
|  DAG Vertices       256MB      |  <- Consensus state
+--------------------------------+
|  Warp Message Queue  64MB      |  <- Pending settlements
+--------------------------------+
|  Network Buffers    128MB      |  <- gRPC/WS buffers
+--------------------------------+
|  Heap / GC          ~700MB     |  <- Dynamic allocations
+================================+

// OrderProcessor handles the full order lifecycle
type OrderProcessor struct {
    engine   *TradingEngine
    dag      *LuxFPC
    warp     *WarpClient
    metrics  *Metrics
}

// ProcessOrder handles a new order from gateway
func (p *OrderProcessor) ProcessOrder(ctx context.Context, req *OrderRequest) (*OrderResponse, error) {
    // 1. Validate order
    order, err := p.validateOrder(req)
    if err != nil {
        return nil, fmt.Errorf("validation failed: %w", err)
    }

    // 2. Risk check
    if err := p.riskCheck(ctx, order); err != nil {
        return nil, fmt.Errorf("risk check failed: %w", err)
    }

    // 3. Add to order book
    orderID := p.engine.OrderBooks[order.Symbol].AddOrder(order)
    if orderID == 0 {
        return nil, ErrOrderRejected
    }

    // 4. Create DAG vertex (async)
    go p.createVertex(ctx, order)

    // 5. Return immediately
    return &OrderResponse{
        OrderID:   orderID,
        Status:    "accepted",
        Timestamp: time.Now(),
    }, nil
}

// createVertex creates a DAG vertex for consensus
func (p *OrderProcessor) createVertex(ctx context.Context, order *Order) {
    vertex := &OrderVertex{
        ID:        generateVertexID(order),
        Order:     order,
        NodeID:    p.dag.NodeID(),
        Height:    p.dag.Height(),
        Parents:   p.dag.Frontier(),
        Timestamp: time.Now(),
    }

    // Add to local DAG
    p.dag.AddVertex(vertex)

    // Broadcast to peers
    p.dag.BroadcastVertex(ctx, vertex)
}

                    +-------------------+
                    |  Order Gateway    |
                    +--------+----------+
                             |
              +--------------+--------------+
              |              |              |
        +-----v-----+  +-----v-----+  +-----v-----+
        | Worker 1  |  | Worker 2  |  | Worker N  |
        +-----+-----+  +-----+-----+  +-----+-----+
              |              |              |
              +--------------+--------------+
                             |
                    +--------v--------+
                    |  Order Book     |
                    |  (Lock-free)    |
                    +-----------------+
                             |
              +--------------+--------------+
              |              |              |
        +-----v-----+  +-----v-----+  +-----v-----+
        | Match     |  | DAG       |  | Warp      |
        | Engine    |  | Consensus |  | Publisher |
        +-----------+  +-----------+  +-----------+

// SecurityConfig for LX chain
type SecurityConfig struct {
    // Consensus security
    MinValidators     int     // Minimum active validators
    QuorumThreshold   float64 // 0.67 for finality

    // Trade security
    PreTradeRiskCheck bool    // Enable risk checks
    MaxOrderSize      *big.Int
    MaxLeverage       int     // For perpetuals

    // Settlement security
    SettlementDelay   time.Duration // Time before settlement final
    RequireMPC        bool          // Require T-Chain MPC for large trades
}

# lxd.yaml - Production configuration
daemon:
  node_id: "lxd-validator-1"
  data_dir: "/var/lib/lxd"
  log_level: "info"

staking:
  d_chain_rpc: "https://api.lux.network/d-chain"
  stake_amount: "2000"  # LUX
  delegation_fee: 200   # 2% in basis points

network:
  subnet_id: "LX_SUBNET_ID_HERE"
  grpc_addr: "0.0.0.0:9100"
  websocket_addr: "0.0.0.0:9101"
  peers:
    - "lxd-validator-2:9100"
    - "lxd-validator-3:9100"

engine:
  backend: "go"  # go, cgo, mlx, cuda
  worker_pool_size: 8
  order_pool_size: 1000000

consensus:
  theta_min: 0.55
  theta_max: 0.65
  round_duration: "50ms"

settlement:
  c_chain_rpc: "https://api.lux.network/c-chain"
  contract_address: "0x..."
  batch_size: 1000
  batch_interval: "100ms"

security:
  tls_cert: "/etc/lxd/tls/cert.pem"
  tls_key: "/etc/lxd/tls/key.pem"

var (
    validatorStake = prometheus.NewGauge(
        prometheus.GaugeOpts{
            Name: "lxd_validator_stake_lux",
            Help: "Current validator stake in LUX",
        },
    )

    consensusParticipation = prometheus.NewCounter(
        prometheus.CounterOpts{
            Name: "lxd_consensus_votes_total",
            Help: "Total votes cast in FPC consensus",
        },
    )

    settlementLatency = prometheus.NewHistogram(
        prometheus.HistogramOpts{
            Name:    "lxd_settlement_latency_seconds",
            Help:    "Time from trade to C-Chain settlement",
            Buckets: prometheus.ExponentialBuckets(0.01, 2, 10),
        },
    )
)