# GRU Settlement Architecture

## Overview

This document details the GRU settlement architecture, including the Classical → Quantum → Ω-Layer flow as established in the GRU Institutional Whitepaper.

## Settlement Flow

The GRU settlement follows a multi-stage pipeline:

```
GRU → FX/SSU → GAS Atomic Network → Ω-Layer Merge → DBIS Prime Ledger
```

## Settlement Stages

### Classical Stage

**Purpose**: Initial settlement state in classical financial systems

**Components**:
- GRU amount and currency
- Source and destination bank identification
- Initial settlement state

**State**: Classical settlement state recorded

### Quantum Stage (GAS)

**Purpose**: Atomic settlement through GAS (Global Atomic Settlements) network

**Process**:
1. Initiate GAS atomic settlement
2. Execute atomic transaction
3. Receive atomic confirmation
4. Record quantum settlement state

**Integration**: Uses existing `AtomicSettlementService` for GAS operations

**Output**: GAS settlement ID and atomic confirmation

### Ω-Layer Finality

**Purpose**: Final settlement through Ω-Layer Settlement Fabric

**Process**:
1. Perform Ω-Layer merge operation
   - Merge classical state
   - Merge quantum state
   - Generate merge operation ID
2. Verify causality stability
   - Ensure no causality violations
   - Verify temporal consistency
3. Verify multi-reality reconciliation
   - Verify consistency across realities
   - Ensure state synchronization
4. Generate finality proof
   - Create finality proof hash
   - Record finality state

**Output**: Ω-Layer finality ID, merge operation ID, and finality proof

## Settlement Pipeline Service

The settlement pipeline is implemented through the `GruSettlementPipelineService`, which:

- Manages pipeline lifecycle
- Coordinates stage progression
- Integrates with GAS network
- Integrates with Ω-Layer Settlement Fabric
- Tracks settlement state across stages

## Finality Requirements

As per the GRU Institutional Whitepaper, finality requires:

1. **Atomic Settlement**: All-or-nothing settlement guarantee
2. **Multi-Reality Reconciliation**: Consistency across all reality layers
3. **Causality Stabilization**: No temporal violations

## Integration Points

### GAS Network Integration

- Uses `AtomicSettlementService` for atomic transactions
- Records GAS settlement confirmations
- Tracks atomic network state

### Ω-Layer Integration

- Performs merge operations
- Verifies causality stability
- Verifies multi-reality reconciliation
- Generates finality proofs

## API Endpoints

- `POST /api/gru/settlement/pipeline` - Initiate settlement pipeline
- `GET /api/gru/settlement/pipeline/:pipelineId` - Get pipeline status
- `POST /api/gru/settlement/gas` - Execute GAS atomic settlement
- `POST /api/gru/settlement/omega` - Execute Ω-Layer finality

## Related Documentation

- [GRU Institutional Whitepaper](./gru-institutional-whitepaper.md)
- [GRU Issuance Governance](./gru-issuance-governance.md)
- [Volume XII: Omega-Layer Settlement Fabric](../volume-xii/omega-lsf.md)