# Hedera Topics Ecosphere leverages topics to enable trustless, transparent communication, especially in to provide secure, verified, or timestamped messages. **1. Creating a Topic** * To start, Ecosphere creates a topic by submitting a transaction to the Hedera Consensus Service, which will return a unique topic ID. * The topic settings include topic name, memo, and permissions (e.g., who can submit messages or delete the topic). **2. Publishing Messages to a Topic** * Once a topic exists, only authorized users can submit messages to it. Each message is hashed, timestamped, and ordered by Hedera nodes, creating an official record of submission. * This is particularly useful for applications needing immutable message logs like our Climate Nodes. **3. Subscribing to a Topic** * Applications or users can subscribe to a topic to receive messages in real-time. This is Users to keep track of data events or updates as they occur. * For example, a logistics app might subscribe to a topic where weather updates are published, providing real-time decision making on routing. By setting up topics and publishing messages to them, Ecosphere leverages Hedera's efficient consensus to achieve verifiable, immutable climate data records for a wide range of applications. --- # 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://docs.ecosphereprime.com/ecosphere/technology/peer-to-peer-data-sharing/hedera-topics.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.