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class=breadcrumbs__link>Concepts</span><li class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link>Understand Logos Delivery protocols</span></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type=button class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Understand Logos Delivery protocols</h1></header>
<h4 class="anchor anchorTargetStickyNavbar_Vzrq" id=understand-the-modular-protocols-that-let-applications-balance-anonymity-scalability-and-latency>Understand the modular protocols that let applications balance anonymity, scalability, and latency.<a href=#understand-the-modular-protocols-that-let-applications-balance-anonymity-scalability-and-latency class=hash-link aria-label="Direct link to Understand the modular protocols that let applications balance anonymity, scalability, and latency." title="Direct link to Understand the modular protocols that let applications balance anonymity, scalability, and latency." translate=no>​</a></h4>
<p><a href=https://docs.logos.co/get-started/glossary#logos-delivery target=_blank rel="noopener noreferrer" class="">Logos Delivery</a> takes a modular approach, providing a range of protocols that enable applications to control the trade-offs involved in the <a href=https://eprint.iacr.org/2017/954.pdf target=_blank rel="noopener noreferrer" class="">Anonymity Trilemma</a>. This flexibility empowers applications to make informed choices regarding the desired balance between anonymity, scalability, and latency.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=the-basics>The basics<a href=#the-basics class=hash-link aria-label="Direct link to The basics" title="Direct link to The basics" translate=no>​</a></h2>
<ul>
<li class="">Logos Delivery is modular, so applications combine protocols to balance anonymity, scalability, and latency.</li>
<li class=""><a href=#relay class="">Relay</a> provides the base publish/subscribe messaging, and <a href=#rln-relay class="">RLN relay</a> extends it with economic spam prevention.</li>
<li class=""><a href=#filter class="">Filter</a>, <a href=#store class="">Store</a>, and <a href=#light-push class="">Light push</a> adapt access for nodes with limited bandwidth or intermittent connections.</li>
</ul>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=relay>Relay<a href=#relay class=hash-link aria-label="Direct link to Relay" title="Direct link to Relay" translate=no>​</a></h2>
<p><a href=https://lip.logos.co/messaging/core/stable/11/relay.html target=_blank rel="noopener noreferrer" class=""><code>Relay</code> protocol</a> employs a Pub/Sub architecture to facilitate the sending and receiving of messages among peers. It extends the <a href=https://github.com/libp2p/specs/blob/master/pubsub/gossipsub/README.md target=_blank rel="noopener noreferrer" class="">libp2p GossipSub protocol</a> to create a privacy-focused peer-to-peer messaging protocol that enables secure communication channels, encryption, and protection against censorship.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=rln-relay>RLN Relay<a href=#rln-relay class=hash-link aria-label="Direct link to RLN Relay" title="Direct link to RLN Relay" translate=no>​</a></h2>
<p><a href=https://lip.logos.co/messaging/core/draft/17/rln-relay.html target=_blank rel="noopener noreferrer" class=""><code>RLN Relay</code> protocol</a> extends the <code>Relay</code> protocol by using <a href=https://lip.logos.co/anoncomms/draft/32/rln-v1.html target=_blank rel="noopener noreferrer" class="">Rate Limit Nullifiers (RLN)</a> to provide efficient and economic spam-prevention. It enforces a rate limit on messages over time for all peers in the network, economically preventing spam, and imposes financial penalties and network removal for spammers. You can find more details in the <a href=https://research.logos.co/rlog/rln-relay target=_blank rel="noopener noreferrer" class="">RLN Relay blog post</a>.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=filter>Filter<a href=#filter class=hash-link aria-label="Direct link to Filter" title="Direct link to Filter" translate=no>​</a></h2>
<p><a href=https://lip.logos.co/messaging/core/draft/12/filter.html target=_blank rel="noopener noreferrer" class=""><code>Filter</code> protocol</a> allows <a href=https://docs.logos.co/get-started/glossary#light-node target=_blank rel="noopener noreferrer" class="">light nodes</a> to selectively subscribe to specific messages relayed by other peers using <a class="" href=/messaging/concepts/content-topics>content topics</a>. It is designed to be a lightweight alternative for accessing the <code>Relay</code> network, particularly tailored for devices with limited bandwidth.</p>
<div class="theme-admonition theme-admonition-info admonition_xJq3 alert alert--info"><div class=admonitionHeading_Gvgb><span class=admonitionIcon_Rf37><svg viewBox="0 0 14 16"><path fill-rule=evenodd d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"/></svg></span>info</div><div class=admonitionContent_BuS1><p><code>Filter</code> protocol helps optimise bandwidth usage, but it has fewer privacy guarantees as it must disclose the <a href=https://docs.logos.co/get-started/glossary#content-topic target=_blank rel="noopener noreferrer" class="">content topic</a> to its peers to retrieve messages.</div></div>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=store>Store<a href=#store class=hash-link aria-label="Direct link to Store" title="Direct link to Store" translate=no>​</a></h2>
<p><a href=https://lip.logos.co/messaging/core/draft/13/store.html target=_blank rel="noopener noreferrer" class=""><code>Store</code> protocol</a> is responsible for storing messages relayed in the network, making it possible to query and retrieve them later. This functionality benefits offline peers by enabling them to retrieve missed messages upon reconnection.</p>
<div class="theme-admonition theme-admonition-info admonition_xJq3 alert alert--info"><div class=admonitionHeading_Gvgb><span class=admonitionIcon_Rf37><svg viewBox="0 0 14 16"><path fill-rule=evenodd d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"/></svg></span>info</div><div class=admonitionContent_BuS1><p>Using <code>Relay</code> and <code>Filter</code> protocols is recommended when a node is online, as <code>Store</code> does not guarantee data availability. The <code>Store</code> protocol is suitable for retrieving messages when connecting to the network, like when a DApp starts.</div></div>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=light-push>Light Push<a href=#light-push class=hash-link aria-label="Direct link to Light Push" title="Direct link to Light Push" translate=no>​</a></h2>
<p><a href=https://lip.logos.co/messaging/core/draft/19/lightpush.html target=_blank rel="noopener noreferrer" class=""><code>Light Push</code></a> is a <a href=https://docs.waku.org/learn/concepts/network-domains#requestresponse-domain target=_blank rel="noopener noreferrer" class="">Request/Response</a> protocol for nodes with limited bandwidth and short connection windows. It allows a client to receive an acknowledgement when sending messages, indicating that at least one peer has received them. Subsequently, the remote peer forwards these messages to the <code>Relay</code> network.</p>
<div class="theme-admonition theme-admonition-info admonition_xJq3 alert alert--info"><div class=admonitionHeading_Gvgb><span class=admonitionIcon_Rf37><svg viewBox="0 0 14 16"><path fill-rule=evenodd d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"/></svg></span>info</div><div class=admonitionContent_BuS1><p>While the <code>Light Push</code> protocol acknowledges the receipt by the remote peer, it does not guarantee network-wide propagation.</div></div>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=waku-message>Waku message<a href=#waku-message class=hash-link aria-label="Direct link to Waku message" title="Direct link to Waku message" translate=no>​</a></h2>
<p><a href=https://lip.logos.co/messaging/core/stable/14/message.html target=_blank rel="noopener noreferrer" class=""><code>Waku message</code></a> specifies the structure and format of messages. It includes the following attributes:</p>
<ul>
<li class=""><code>content_topic</code> attribute for <a class="" href=/messaging/concepts/content-topics>content-based filtering</a>.</li>
<li class=""><code>payload</code> attribute containing the message data payload to be sent.</li>
<li class=""><code>meta</code> attribute for conveying additional details to various protocols for application-specific processing.</li>
<li class=""><code>timestamp</code> attribute signifying the time at which the message was generated by its sender.</li>
<li class=""><code>ephemeral</code> attribute specifying whether the network should not store the message.</li>
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