LUKSO Expert

Complete knowledge base for building on LUKSO — the blockchain for creative economies,

digital identity, and new social standards.

Quick Facts

• Chain ID: 42 (mainnet) / 4201 (testnet)
• Native token: LYX
• Consensus: Proof of Stake (32 LYX per validator)
• EVM compatible: Yes, unmodified Ethereum execution layer
• Unique: Universal Profiles (smart contract accounts) instead of EOAs
• Founder: Fabian Vogelsteller (also created ERC-20 and ERC-725)

Core Concepts

LUKSO extends Ethereum with LSP standards (LUKSO Standard Proposals) that enable:

• Smart accounts (Universal Profiles) with built-in permissions, metadata, and social features
• Flexible tokens (LSP7/LSP8) with safety features like force parameter and universal receiver hooks
• Gasless transactions via relay service (LSP25)
• On-chain social graph via followers system (LSP26)
• Profile customization via The Grid (LSP28)

Architecture Overview

Universal Profile (LSP0/ERC725Account)
├── KeyManager (LSP6) — permission layer
│   ├── Controllers — addresses with specific permissions
│   └── Allowed calls/addresses — fine-grained access control
├── Profile Data (LSP3) — name, description, avatar, links
├── Universal Receiver (LSP1) — hooks for incoming transactions
├── Owned Assets (LSP5) — registry of tokens/NFTs owned
├── Issued Assets (LSP12) — registry of tokens/NFTs created
└── The Grid (LSP28) — customizable profile layout

Reference Files

Load these based on what you need:

LSP Standards (references/lsp-standards.md)

Complete reference for ALL LSP standards (LSP0-LSP28+). Includes interfaces,

function signatures, and implementation details. Read when working with any

specific LSP or needing to understand the standards architecture.

Developer Patterns (references/dev-patterns.md)

Practical code examples and implementation guides. Covers UP creation, token

operations, permissions, gasless transactions, and common pitfalls. Read when

writing code or debugging LUKSO-specific issues.

Ecosystem (references/ecosystem.md)

Projects, team, community channels, grants, and chain infrastructure. Read when

answering ecosystem questions or looking for project information.

Contracts & Repos (references/contracts-and-repos.md)

Deployed contract addresses, GitHub repositories, NPM packages, and API endpoints.

Read when looking up addresses, ABIs, or integration endpoints.

Key Contract Addresses (Mainnet)

> Full address list in references/contracts-and-repos.md

Common Operations Quick Reference

Resolve username to UP address

# Envio GraphQL
query { Profile(where: {name: {_eq: "username"}}) { id name } }

Check UP count

query { Profile_aggregate { aggregate { count } } }

Follow a profile (LSP26)

const LSP26 = "0xf01103E5a9909Fc0DBe8166dA7085e0285daDDcA";
const calldata = lsp26Contract.methods.follow(targetAddress).encodeABI();
await universalProfile.methods.execute(0, LSP26, 0, calldata).send({from: controller});

Important Gotchas

1. force parameter (LSP7/LSP8): Set to true to send tokens to any address.

Set to false (default) to only send to UPs with a Universal Receiver — prevents

accidental sends to EOAs or contracts that can't handle them.

1. LSP6 Permissions: Permissions are bitmask-based. Common mistake: granting

CALL permission but forgetting EXECUTE_RELAY_CALL for gasless transactions.

1. ERC725Y data encoding: Use @erc725/erc725.js for encoding — manual encoding

is error-prone, especially for VerifiableURI and array types.

1. Gas estimation: UP transactions go through KeyManager proxy, so gas estimates

can be off. Add 20-30% buffer.

Developer Resources

• Docs: https://docs.lukso.tech
• GitHub: https://github.com/lukso-network
• Medium: https://medium.com/lukso
• Discord: https://discord.gg/lukso
• Testnet faucet: https://faucet.testnet.lukso.network