💻Overview

Built By DAO runs on a comprehensive smart contract system deployed on Base (Ethereum L2). This section provides technical documentation for developers, integrators, and contributors working with the DAO's on-chain infrastructure.

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💻 System Overview

⛓️ Network	📜 Contracts	🔧 Solidity	🏗️ Pattern
Base (L2)	20 contracts	0.8.33	UUPS Proxy

🎯 Purpose: Secure, decentralized infrastructure for affordable housing DAO

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🏗️ Architecture

🏗️ Architecture Summary

The system consists of 20 smart contracts across five layers:

Layer	Purpose	Contracts
🏛️ Governance	Proposals, Voting, QV, 4× Ceiling	Governance V2.1
📊 Registry	Rank weights, Activity tracking	RankRegistry, ActivityTracker
👤 Identity	Member and investor NFTs	DAOMembershipNFT, Investor NFTs
🪙 Token	Dual-token system	BLTBY, EQTBLT
💰 Financial	Treasury, vaults, spending	Treasury, Bank, Vaults
🏢 Business	Revenue, rentals, redemption	DAOBusiness, Rental, Redemption

🪙 Token Contracts

🎫 NFT Contracts

💰 Financial Contracts

🏢 Business Contracts

🏛️ Governance Contracts

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🔐 Common Patterns

1. Founder → Multisig Transition

All contracts implement a one-way transition to decentralized control:

function enableMultisig(address _multisig) external onlyFounder {
    if (multisigEnabled) revert MultisigAlreadyEnabled();
    multisigWallet = _multisig;
    multisigEnabled = true;
}

2. Soul-Bound NFTs

NFTs override _update() to prevent transfers:

function _update(address to, uint256 tokenId, address auth) internal override {
    address from = _ownerOf(tokenId);
    if (from == address(0)) return super._update(to, tokenId, auth); // Allow mint
    if (to == address(0)) return super._update(to, tokenId, auth);   // Allow burn
    revert TransferNotAllowed();
}

3. Multi-Stablecoin Support

Financial contracts normalize across USDC (6 decimals), USDT (6), DAI (18), PYUSD (6):

function _normalizeToUsd(address token, uint256 amount) internal view returns (uint256) {
    uint8 tokenDecimals = stablecoinDecimals[token];
    if (tokenDecimals == 6) return amount;
    if (tokenDecimals > 6) return amount / (10 ** (tokenDecimals - 6));
    return amount * (10 ** (6 - tokenDecimals));
}

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🔑 Role Reference

Role	Description	Contracts
DEFAULT_ADMIN_ROLE	Grant/revoke all roles	All
ADMIN_ROLE	Administrative functions	Most contracts
MINTER_ROLE	Mint tokens/NFTs	BLTBYToken, EQTBLTToken, NFTs
MANAGER_ROLE	Operational management	Bank, Investor, NFTs
GOVERNANCE_ROLE	Execute governance decisions	Governance, Treasury
PROPERTY_MANAGER_ROLE	Manage properties/leases	RentalAndRebate
RECORDER_ROLE	Record activity	ActivityTracker

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⚙️ Technical Specifications

Property	Value
Solidity Version	0.8.33
Network	Base (Ethereum L2)
Token Standard	ERC-20, ERC-721
Upgrade Pattern	OpenZeppelin UUPS
Access Control	Role-based (AccessControl)

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🔗 Quick Links

• 📜 Contract Index

• 🏗️ Architecture Deep Dive

• 🏛️ Governance V2.1 Spec

• 🔐 Security Analysis

• 🔌 API Reference

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🔗 Related Pages

Smart ContractsBLTBYTokenEQTBLTTokenGovernance🪙Overview🗳️Overview