CBE Study Guide 2026

A key benefit of dApps over traditional applications is their censorship resistance. Because dApps operate on decentralized blockchain networks, they are not controlled by a single entity and cannot be easily shut down, altered, or censored by governments or corporations. This ensures continuous availability and user access.

Private blockchains are controlled by a single entity, making them centralized. This centralization allows for higher performance and privacy controls but sacrifices the core benefit of decentralization, which provides the trustlessness and censorship resistance found in public networks.

System Architecture in Certified Blockchain Expert fundamentally aims to ensure system reliability, security, and optimal performance.

In the context of smart contracts, 'gas' refers to the execution fee required to perform operations on the Ethereum blockchain. It is a unit that measures the computational effort needed to execute transactions or smart contract functions. Users pay gas fees in Ether to compensate miners for the resources consumed in processing and validating these operations.

The defining characteristic of a DApp is that its backend logic runs on a decentralized network, not a central server. This backend is primarily composed of smart contracts that execute on the blockchain, ensuring the application is censorship-resistant and operates in a trustless manner.

A smart contract is a self-executing program stored directly on a blockchain. It automatically executes predefined actions and terms of an agreement when specific conditions are met, without the need for intermediaries. This ensures transparency, immutability, and trustless execution of agreements.