Introduction

Quant Fusion’s Multi-Ledger Rollup (MLR) is the world’s first Layer 2.5 technology, designed to unify assets and applications across multiple distributed ledgers. Unlike traditional rollups, which are confined to a single chain, MLR provides a shared execution environment that seamlessly spans both public and permissioned blockchains. This innovation eliminates the need for complex and insecure bridging, reduces asset duplication across chains, and enables institutions to transact with security, scalability, and compliance built in.

This documentation provides the technical foundation you need to start building with Multi-Ledger Rollup. It covers:

• Connected Networks – An overview of the public and permissioned blockchains currently integrated into MLR (including Sepolia, Amoy, and Quant Besu), the tokens they support, and their roles in the rollup.
• UI Guide – How to access and use the MLR Transaction Explorer and Smart Contract Explorer in Quant Connect.
• Token Information & Faucets – Details of the testnet ERC-20 tokens deployed on connected chains and how to acquire them.
• Prerequisites & Access Control – Authentication, error handling, and the set of supported ETH-JSON-RPC methods with permission rules.
• Smart Contract Deployment – The core contracts that enable deposits and withdrawals across supported blockchains.
• Besu Testnet Access – Connection information for Quant’s Besu private testnet, showcasing interoperability between permissioned and public chains.

Together, these pages will help you begin building cross-ledger applications with Quant Fusion.