> For the complete documentation index, see [llms.txt](https://nora-2.gitbook.io/nora-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nora-2.gitbook.io/nora-docs/technology-stack/ethereum-blockchain.md).

# Ethereum Blockchain

At the core of NORA’s technology is the **Ethereum blockchain**, a decentralized platform known for its reliability, scalability, and ability to support smart contracts. By utilizing Ethereum, NORA ensures that all communications, transactions, and operations are handled in a **trustless** and **secure** environment.

* **Smart Contracts**: NORA uses Ethereum’s **smart contracts** to handle essential operations such as encrypting messages, managing identity verification, processing transactions, and securely storing data. Smart contracts are self-executing and tamper-proof, providing users with peace of mind knowing that every action within the app is automated, transparent, and secure.
* **Decentralization**: The decentralization provided by Ethereum means that there is **no central authority** or single point of failure. All data is stored across a distributed network of nodes, ensuring that it cannot be manipulated or accessed by a third party, ensuring **complete privacy** and **data sovereignty**.
* **Gas Optimization**: While Ethereum typically requires **gas fees** for transactions, NORA has developed innovative solutions to minimize gas usage. For example, **batch processing** is used to consolidate multiple actions into a single transaction, reducing costs for users while maintaining high efficiency.
* **Security**: Ethereum's robust security model makes it ideal for NORA, as the blockchain has a long track record of successfully securing billions of dollars worth of assets and transactions. By building on Ethereum, NORA benefits from its **proof-of-work** consensus mechanism, ensuring that all operations are resistant to censorship and fraud.