# Sub-Volume B: Global Reserve Unit (GRU) Integration

## Overview

The Global Reserve Unit (GRU) Integration integrates the GRU monetary system into DBIS' omniversal framework with hierarchical structure and XAU-anchored valuation.

## GRU Hierarchy

### Defined Ratios

- **1 M00 GRU = 5 M0 GRU**
- **1 M00 GRU = 25 M1 GRU**
- **1 M00 GRU = x M0 GRU + y M1 GRU** (mixed composition)

### Unit Types

- **M00**: Base unit (highest tier)
- **M0**: Intermediate unit (1 M00 = 5 M0)
- **M1**: Lowest unit (1 M00 = 25 M1, 1 M0 = 5 M1)

## GRU Asset Valuation

All triangulations occur through **XAU (gold)**, anchoring GRU to:

- **Fiat currencies** (USD, EUR, etc.)
- **Commodities** (Silver, Platinum, Oil, etc.)
- **CBDC** (Central Bank Digital Currencies)
- **Tokenized assets** (Security tokens, etc.)

### Valuation Formula

```
GRU Value = XAU Value × Triangulation Rate
```

Base rate: **1 GRU M00 = 1 oz XAU** (troy ounce)

## GRU Bond Systems

### GRU-Linked Bonds

Two bond types are supported:

- **Li99PpOsB10**: 99-year bond with 10% interest (one-time structure)
- **Li99PpAvB10**: 99-year bond with 10% average interest

### Bond Features

- Principal amount in GRU
- Fixed or variable interest rates
- Coupon payments
- Maturity date calculation
- Automatic redemption at maturity

## GRU Liquidity Loop

### Atomic Transaction Loop

The GRU liquidity loop executes atomic transactions until a target value is reached:

```
7 → 10 GRU → 9.55 (net after FX)
```

**Process**:
1. Start with initial amount (e.g., 7 GRU)
2. Execute atomic transaction via GAS network
3. Apply FX cost (e.g., 4.5%)
4. Calculate net value (e.g., 9.55)
5. Re-run until target value reached or max iterations

### Loop Parameters

- `initialAmount`: Starting GRU amount
- `targetAmount`: Target GRU amount
- `targetNetValue`: Target net value after FX
- `maxIterations`: Maximum loop iterations (default: 10)

## Services

### GruService

Main service for GRU unit management and conversion.

**Location**: `src/core/monetary/gru/gru-service.ts`

**Key Methods**:
- `convertGruUnits()` - Convert between GRU unit types
- `createMixedGruComposition()` - Create mixed GRU composition
- `getGruUnit()` - Get GRU unit by ID
- `getGruUnitsForBank()` - Get GRU units for a bank

### GruValuationService

Service for XAU-anchored valuation and triangulation.

**Location**: `src/core/monetary/gru/gru-valuation.service.ts`

**Key Methods**:
- `calculateGruValuation()` - Calculate GRU valuation through XAU triangulation
- `getTriangulationHistory()` - Get triangulation history

### GruBondsService

Service for GRU-linked bond management.

**Location**: `src/core/monetary/gru/gru-bonds.service.ts`

**Key Methods**:
- `issueGruBond()` - Issue GRU-linked bond
- `calculateBondValueAtMaturity()` - Calculate bond value at maturity
- `payBondCoupon()` - Pay bond coupon
- `redeemBond()` - Redeem bond at maturity

### GruLiquidityLoopService

Service for GRU liquidity loop execution.

**Location**: `src/core/monetary/gru/gru-liquidity-loop.service.ts`

**Key Methods**:
- `executeLiquidityLoop()` - Execute GRU liquidity loop
- `getLiquidityLoop()` - Get liquidity loop by ID
- `getLiquidityLoopsForBank()` - Get liquidity loops for a bank

## API Endpoints

### Unit Management

- `POST /api/gru/convert` - Convert between GRU unit types
- `GET /api/gru/unit/:gruUnitId` - Get GRU unit by ID
- `GET /api/gru/units/bank/:sovereignBankId` - Get GRU units for a bank

### Valuation

- `POST /api/gru/valuation` - Calculate GRU valuation through XAU triangulation
- `GET /api/gru/valuation/history` - Get triangulation history

### Bonds

- `POST /api/gru/bond/issue` - Issue GRU-linked bond
- `GET /api/gru/bond/:bondId` - Get bond by ID
- `GET /api/gru/bonds/bank/:sovereignBankId` - Get bonds for a bank
- `POST /api/gru/bond/:bondId/coupon` - Pay bond coupon
- `POST /api/gru/bond/:bondId/redeem` - Redeem bond at maturity

### Liquidity Loop

- `POST /api/gru/liquidity-loop` - Execute GRU liquidity loop
- `GET /api/gru/liquidity-loop/:loopId` - Get liquidity loop by ID
- `GET /api/gru/liquidity-loops/bank/:sovereignBankId` - Get liquidity loops for a bank

## Database Schema

### GruUnit

Main GRU unit record.

**Fields**:
- `gruUnitId` - Unique GRU unit identifier
- `unitType` - Unit type (M00, M0, M1)
- `amount` - GRU amount
- `status` - Unit status (active, locked, redeemed)

### GruConversion

GRU unit conversion record.

**Fields**:
- `sourceAmount` - Source amount
- `sourceType` - Source unit type
- `targetAmount` - Target amount
- `targetType` - Target unit type
- `conversionRate` - Conversion rate

### GruTriangulation

XAU triangulation record.

**Fields**:
- `xauValue` - Value in XAU (gold)
- `targetValue` - Value in target asset
- `targetAssetType` - Target asset type (fiat, commodity, cbdc, tokenized)
- `triangulationRate` - Triangulation rate

### GruBond

GRU-linked bond record.

**Fields**:
- `bondType` - Bond type (Li99PpOsB10, Li99PpAvB10)
- `principalAmount` - Principal amount in GRU
- `maturityDate` - Maturity date
- `interestRate` - Interest rate
- `finalValue` - Final value at maturity

### GruLiquidityLoop

GRU liquidity loop record.

**Fields**:
- `initialAmount` - Initial GRU amount
- `targetAmount` - Target GRU amount
- `targetNetValue` - Target net value after FX
- `iterations` - Number of iterations
- `targetReached` - Whether target was reached

## Integration Points

- **SSU**: GRU becomes a synthetic reserve class in SSU basket
- **GAS Network**: Liquidity loop uses GAS for atomic transactions
- **RTGS Layers**: GRU supported across RTGS layers
- **FX Engine**: Triangulation uses FX rates for conversion

## Use Cases

### Multi-Tier Reserve Management

Manage reserves across M00, M0, and M1 tiers with automatic conversion.

### XAU-Anchored Valuation

Value GRU in any asset type through XAU triangulation.

### Long-Term Bond Issuance

Issue 99-year bonds linked to GRU with fixed or variable interest.

### Automated Liquidity Optimization

Execute liquidity loops to optimize GRU value through atomic transactions.

## Example Usage

```typescript
import { gruService } from '@/core/monetary/gru/gru-service';
import { gruValuationService } from '@/core/monetary/gru/gru-valuation.service';

// Convert GRU units
const conversion = await gruService.convertGruUnits({
  unitType: 'M00',
  amount: '10',
  targetType: 'M0',
});
// Result: 50 M0 (10 M00 × 5)

// Calculate valuation
const valuation = await gruValuationService.calculateGruValuation({
  gruUnitId: 'GRU-UNIT-123',
  targetAssetType: 'fiat',
  targetCurrencyCode: 'USD',
});
// Result: GRU value in USD through XAU triangulation
```

## GRU Banking Operations Manual (Volume IV)

The **GRU Banking Operations Manual** provides comprehensive operational procedures, account structure, daily workflows, and compliance systems for all banks, SCBs, supranational entities, and private institutions interacting with GRU.

**See**: [GRU Banking Operations Manual](./sub-volume-b-gru-operations-manual.md) for complete operational documentation.

### Key Features

- **GRU Account Classes (GRA-0 through GRA-6)** - Hierarchical account structure for different entity types
- **Daily Operations** - Opening procedures, transaction processing, and end-of-day closeout
- **Reconciliation** - GAS reconciliation, quantum drift correction, and compliance snapshots
- **Liquidity Management** - XAU monitoring, predictive models, and GLP integration
- **Risk Management** - Daily controls, volatility screening, and SARE/ARI/Q-Guard integration
- **Settlement Operations** - Classical → Quantum → Ω-Layer pipeline processing
- **Compliance & Reporting** - Daily/monthly/annual reports and ARI submission
- **Security Operations** - QEK verification, ILIE enforcement, and threat detection
- **Interoperability** - SWIFT/Metaverse/Commodity/Quantum routing and conversion gateways

### Services

- **GruAccountService** - Account class management (GRA-0 through GRA-6)
- **GruDailyOperationsService** - Daily operations workflows
- **GruReconciliationService** - Reconciliation procedures
- **GruLiquidityManagementService** - Liquidity management
- **GruRiskManagementService** - Risk controls and monitoring
- **GruSettlementOperationsService** - Multi-layer settlement operations
- **GruComplianceReportingService** - Compliance reporting
- **GruSecurityOperationsService** - Security operations
- **GruInteroperabilityService** - Interoperability and conversion

### API Endpoints

All GRU operations endpoints are available under `/api/gru/`:
- Account management: `/api/gru/accounts`
- Daily operations: `/api/gru/operations/daily/*`
- Reconciliation: `/api/gru/reconciliation/*`
- Liquidity: `/api/gru/liquidity/*`
- Risk: `/api/gru/risk/*`
- Settlement: `/api/gru/settlement/*`
- Compliance: `/api/gru/compliance/*`
- Security: `/api/gru/security/*`
- Interoperability: `/api/gru/interoperability/*`

## Status

✅ **Implemented** - Sub-Volume B is fully implemented and integrated with existing DBIS systems.

✅ **Operations Manual Implemented** - GRU Banking Operations Manual (Volume IV) is fully implemented with all services, APIs, and database models.