Technology Stack

Smart Contract Architecture

MetaLedger's smart contract stack is divided into three layers: core protocol contracts (sequencer management, bridge logic, rollup state), economy primitives (NFT standards, marketplace settlement, royalty enforcement), and studio-facing contracts (configurable economy parameters, yield mechanics, governance).

All contracts are written in Solidity 0.8.x, audited by two independent firms before mainnet deployment, and formally verified using Certora Prover for critical state transition logic. Upgrade paths use OpenZeppelin's TransparentUpgradeableProxy pattern with a 7-day timelock and governance veto right.

Security Model

MetaLedger operates a defence-in-depth security model across four layers:

Layer 1 — Secure Development

All contracts written against a custom security checklist covering reentrancy, integer overflow, access control, oracle manipulation, and MEV attack vectors. Mandatory peer review by a security-designated engineer before any contract enters audit queue.

Layer 2 — External Audit

Two independent audit firms engage on every major contract deployment. Current audit partners: Trail of Bits (protocol layer) and OpenZeppelin (economy primitives). Audit reports are published publicly within 30 days of completion.

Layer 3 — Runtime Monitoring

Forta-based threat detection monitors all on-chain activity in real time. Automated circuit breakers pause bridge outflows if volume exceeds 3× the 7-day average. Security team on-call 24/7 with a 15-minute SLA for critical alerts.

Layer 4 — Insurance

A $5M insurance fund, maintained in a diversified stablecoin reserve, backs all in-transit bridge assets. Nexus Mutual coverage supplements on-chain reserves for smart contract exploit scenarios.

Economy Simulation Engine

The MetaLedger Economy Engine is an agent-based simulation platform that models game economies before and after deployment. Pre-launch, it runs 10,000 scenarios modelling player archetypes (organic players, yield farmers, whales, sybil attackers) against a studio's proposed tokenomics parameters. Post-launch, it ingests real on-chain data to continuously update its model and surface recommended parameter adjustments.

• Simulation runtime: 10,000 scenarios in under 4 minutes on standard hardware
• Player archetypes modelled: 8 distinct agent types with configurable prevalence ratios
• Output: Parameter recommendation set, risk score, and projected 12-month economy health trajectory
• Post-launch monitoring: Real-time economy health score updated every 6 hours

Account Abstraction Implementation

MetaLedger's AA implementation is fully EIP-4337 compliant with three additional extensions for gaming use cases:

• Session Keys: Time-limited signing keys that authorise specific contract interactions without full wallet access. Default session duration: 8 hours. Used to eliminate per-transaction popups during gameplay.
• Batch Transactions: Bundle up to 100 actions into a single user-visible confirmation. Critical for games with high-frequency micro-transactions.
• Studio Paymaster: Gas sponsorship contract that studios fund to cover player transaction costs. Studios earn a 0.05% MLL rebate on all sponsored transactions.

SDK Architecture

The MetaLedger SDK is a TypeScript-first library distributed via NPM that abstracts the entire MetaLedger protocol stack into a simple API surface. The SDK is framework-agnostic and has been integrated into games built on Unity, Unreal Engine, React Native, and standard web frameworks.