# Central-Ledger Services

The central ledger is a series of services that facilitate clearing and settlement of transfers between DFSPs, including the following functions:

• Brokering real-time messaging for funds clearing
• Maintaining net positions for a deferred net settlement
• Propagating scheme-level and off-transfer fees

# 1. Central Ledger Process Design

# 1.1 Architecture overview

# 2. Transfers End-to-End Architecture

# 2.1 Transfers End-to-End Architecture for v1.1

# 2.2 Transfers End-to-End Architecture for v1.0

# 3. Database Design

# Note

The grey-colored tables are specific to the transfer process. The blue- and green-colored tables are used for reference purposes during the transfer process.

Summary of the tables specific to the transfer process;

• transfer - stores data related to the transfer;
• transferDuplicateCheck - used to identify duplication during the transfer requests process;
• transferError - stores information on transfer errors encountered during the transfer process;
• transferErrorDuplicateCheck - used to identify duplication error transfer processes;
• transferExtensions - stores information on the transfer extension data;
• transferFulfilment - stores data for transfers that have completed the prepare transfer process;
• transferFulfilmentDuplicateCheck - used to identify duplicate transfer fulfilment requests;
• transferParticipant - participant information related to the transfer process;
• transferStateChange - used to track state changes of each individual transfer, creating an audit trail for a specific transfer request;
• transferTimeout - stores information of transfers that encountered a timeout exception during the process;
• ilpPacket - stores the ilp package for the transfer;

The remaining tables in the below ERD are either lookup (blue) or settlement-specific (red) and are included as direct or indirect dependencies to depict the relation between the transfer specific entities and the transfer tables.

The Central Ledger database schema definition Central-Ledger Database Schema Definition.

# 4. API Specification

Refer to Central Ledger API in the API Specifications section.