Control over private keys shifts responsibility directly to users, making architecture design critical. Without strong encryption and seamless chain interaction, non-custodial systems risk usability, friction and asset exposure. A well-structured decentralized crypto wallet integrates deterministic key generation, encrypted local storage, blockchain node connectivity, and optional hardware wallet support. Features such as staking integration, token swaps, and cross-network compatibility enhance functionality while preserving autonomy. Balancing usability with cryptographic strength defines sustainable adoption. Understanding these architectural pillars can help determine whether a non-custodial wallet model fits long-term platform goals.