# Event-Driven Mechanism The choice of an event-driven mechanism for NFT updates directly tackles Ethereum's scalability challenges and high transaction costs by using events to efficiently signal changes. Events are chosen over direct on-chain updates or external databases due to their lightweight nature, significantly reducing the gas fees associated with NFT updates. This method enables dynamic and flexible modifications to NFT metadata or states without altering the core immutable data on the blockchain, thus preserving integrity while ensuring compatibility with established NFT standards like `ERC-721` and `ERC-1155`. Beyond offering a scalable and cost-effective solution, this strategy broadens the scope for dynamic content and real-time updates across a range of applications, thereby enhancing the overall utility and interactivity of NFTs within the Ethereum ecosystem. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://martinzerox.gitbook.io/zerox-network-whitepaper/erc-xxxx/event-driven-mechanism.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.