# Design Principles

#### **1. Non-Custodial by Default**

Tychi never holds or moves user assets without explicit user-signed authorization.\
Private keys remain local to the device.

#### **2. Abstracted Complexity**

Gas fragmentation, routing, multi-chain differences, and DApp interactions are abstracted behind predictable flows.\
The system must reduce cognitive load without reducing user control.

#### **3. Modular Feature System**

All advanced capabilities (gas abstraction, cold wallet mode, debit card, AI modules) operate as independent modules, so the wallet remains lightweight and maintainable.

#### **4. Assistive Intelligence, Not Automation**

AI modules (like PTI or fee insights) provide guidance and risk signals, but **never** execute, alter, or block user transactions.

#### **5. Cross-Chain Uniformity**

Regardless of chain (EVM, Solana, Sui, Tron), transaction review, signing, and confirmation follow a consistent interface to avoid user confusion and reduce error rates.

These principles define how Tychi behaves across the app, backend systems, chain integrations, and future modules.