Smart Contracts

Reentrancy Protection: Guards against reentrancy attacks
Access Control: Proper authorization for all functions
Input Validation: Comprehensive validation of all inputs
Emergency Pause: Ability to pause the contract in emergencies

Architecture Overview

ZeroLedger's smart contract system consists of five several contracts designed for modularity, security, and gas efficiency:

ZeroLedger Vault: Core contract managing commitments and transactions
Morpho Lending Vault: A permissionless immutable ERC-4626 vault that lends USDC tokens on isolated USDC/ETH Morpho Market
Forwarder: Meta-transaction and batching support (permissionless)
ProtocolManager: Protocol-level parameter management (fees, TVL limits)
Administrator: Manages administrative functions and protocol governance
InvoiceFactory: Creates one-time proxy contracts for private invoicing
TokenDistributor: A contract that manages ZRL tokens, farming & airdrop.

All contracts can be found in the official contracts repo

The Forwarder contract is permissionless and extends the OZ meta-transaction contract, enabling meta-transactions and advanced transaction patterns:

Gasless Transactions: Users can execute transactions without paying gas directly
Batch Operations: Multiple operations in a single transaction
Paymaster Integration: Third-party gas payment support
Signature Verification: EIP-712 and ERC1271 compliant signature verification via solady signature checker based on EIP-6492

All administrative functions are managed through multisig wallets, ensuring no single entity can make critical changes:

Admin Multisig: Controls protocol roles management
Maintainer Multisig: Controls protocol contract upgrades
Security Council Multisig: Manages emergency pauses and emergency withdraw from Morpho Lending Vault to ZeroLedger Vault
Treasury Manager Multisig: Controls fee parameters, Security Council fees and treasury operations