# Planetary Settlement Grid (PSG)

## Overview

The PSG forms the physical + logical backbone of DBIS settlement worldwide. It is globally distributed, quantum-secure, fault-tolerant at planetary scale, and multi-asset aware.

## Components

### Geo-Redundant Sovereign Nodes
- Each SCB has at least 3 nodes across different regions
- PQ-encrypted replication links

### DBIS Master Grid
- Global ledger orchestrator
- Settlement finality controller
- Quantum-grade consensus engine

### Supra-Sovereign Relay Hubs (SSR-Hubs)
- Route traffic across continents
- Optimize latency and FX routing
- Provide fallback paths during crises

## Settlement Epochs

PSG commits global settlement every:
- **1 second** for CBDC + fiat
- **5 seconds** for commodities
- **10 seconds** for securities

Epoch commit rule:
```
PSG_State = HASH(SCB_blocks + CBDC_tx + Commodity_tx + Security_tx)
```

## API Endpoints

- `POST /api/v1/psg/nodes` - Create geo-redundant node
- `POST /api/v1/psg/epochs` - Create settlement epoch
- `GET /api/v1/psg/epochs` - Get recent epochs
- `POST /api/v1/psg/relay-hubs` - Create relay hub
- `POST /api/v1/psg/optimize-route` - Optimize routing path