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<title data-rh="true">56/STATUS-COMMUNITIES | Vac Research</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://vac.dev/status/56/communities"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="image" content="https://vac.dev/_og/a871973635f0a705ebb08380876bfce1cb883dd4.png"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-status-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-status-current"><meta data-rh="true" property="og:title" content="56/STATUS-COMMUNITIES | Vac Research"><meta data-rh="true" name="description" content="Status Communities allow multiple users to communicate in a discussion space. This is a key feature of the Status application."><meta data-rh="true" property="og:description" content="Status Communities allow multiple users to communicate in a discussion space. This is a key feature of the Status application."><link data-rh="true" rel="icon" href="/theme/image/favicon.ico"><link data-rh="true" rel="canonical" href="https://vac.dev/status/56/communities"><link data-rh="true" rel="alternate" href="https://vac.dev/status/56/communities" hreflang="en"><link data-rh="true" rel="alternate" href="https://vac.dev/status/56/communities" hreflang="x-default"><link rel="alternate icon" type="image/png" href="/theme/image/favicon.png">
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href="/status/65/account-address">65/STATUS-ACCOUNT-ADDRESS</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/status/71/push-notification-server">71/STATUS-PUSH-NOTIFICATION-SERVER</a></li></ul></nav></div></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row docItemGrid_SzoZ"><div class="docItemCol_F52z"><div class="docItemContainer_hrrU"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_RLvU" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><a class="breadcrumbs__item" href="/status"><span class="lsd-typography lsd-typography--body3">Home</span></a><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="lsd-typography lsd-typography--body3 breadcrumbs__link" itemprop="name">56/STATUS-COMMUNITIES</span><meta itemprop="position" content="1"></li></ul></nav><div class="theme-doc-markdown markdown"><header><h1>56/STATUS-COMMUNITIES</h1><div class="tocMobile_imaF"><div class="tocCollapsible_ROek theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_dxRj"><div></div><span class="lsd-typography lsd-typography--body2">On this page</span><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" class="lsd-icon lsd-icon--small lsd-icon--filled"><path d="M10.5 5.66125L9.6775 4.83875L7 7.51041L4.3225 4.83874L3.5 5.66125L7 9.16125L10.5 5.66125Z" fill="black"></path></svg></button></div></div></header><ul><li>Status: draft</li><li>Category: Standards Track</li><li>Editor: Aaryamann Challani &lt;<a href="mailto:p1ge0nh8er@proton.me" target="_blank" rel="noopener noreferrer">p1ge0nh8er@proton.me</a>&gt;</li><li>Contributors:<ul><li>Andrea Piana &lt;<a href="mailto:andreap@status.im" target="_blank" rel="noopener noreferrer">andreap@status.im</a>&gt;</li><li>Prem Chaitanya Prathi &lt;<a href="mailto:prem@waku.org" target="_blank" rel="noopener noreferrer">prem@waku.org</a>&gt;</li></ul></li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="abstract">Abstract<a href="#abstract" class="hash-link" aria-label="Direct link to Abstract" title="Direct link to Abstract">​</a></h2><p>This document describes the design of Status Communities over Waku v2,
allowing for multiple users to communicate in a discussion space.
This is a key feature for the Status messaging app.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="background-and-motivation">Background and Motivation<a href="#background-and-motivation" class="hash-link" aria-label="Direct link to Background and Motivation" title="Direct link to Background and Motivation">​</a></h2><p>The purpose of Status communities, as specified in this document,
is allowing for large group chats.
Communities can have further substructure, e.g. specific channels.</p><p>Smaller group chats, on the other hand,
are out of scope for this document and
can be built over <a href="/status/55/1to1-chat">55/STATUS-1TO1-CHAT</a>.
We refer to these smaller group chats simply as &quot;group chats&quot;,
to differentiate them from Communities.</p><p>For group chats based on <a href="/status/55/1to1-chat">55/STATUS-1TO1-CHAT</a>,
the key exchange mechanism MUST be X3DH,
as described in <a href="/waku/standards/application/53/x3dh">53/WAKU2-X3DH</a>.</p><p>However, this method does not scale as the number of participants increases,
for the following reasons -</p><ol><li>The number of messages sent over the network increases with the number of participants.</li><li>Handling the X3DH key exchange for each participant is computationally expensive.</li></ol><p>Having multicast channels reduces the overhead of a group chat based on 1:1 chat.
Additionally, if all the participants of the group chat have a shared key,
then the number of messages sent over the network is reduced to one per message.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="terminology">Terminology<a href="#terminology" class="hash-link" aria-label="Direct link to Terminology" title="Direct link to Terminology">​</a></h2><ul><li><strong>Community</strong>: A group of peers that can communicate with each other.</li><li><strong>Member</strong>: A peer that is part of a community.</li><li><strong>Admin</strong>: A member that has administrative privileges.
Used interchangeably with &quot;owner&quot;.</li><li><strong>Channel</strong>: A designated subtopic for a community. Used interchangeably with &quot;chat&quot;.</li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="design-requirements">Design Requirements<a href="#design-requirements" class="hash-link" aria-label="Direct link to Design Requirements" title="Direct link to Design Requirements">​</a></h2><p>Due to the nature of communities,
the following requirements are necessary for the design of communities -</p><ol><li>The creator of the Community is the owner of the Community.</li><li>The Community owner is trusted.</li><li>The Community owner can add or remove members from the Community.
This extends to banning and kicking members.</li><li>The Community owner can add, edit and remove channels.</li><li>Community members can send/receive messages
to the channels which they have access to.</li><li>Communities may be encrypted (private) or unencrypted (public).</li><li>A Community is uniquely identified by a public key.</li><li>The public key of the Community is shared out of band.</li><li>The metadata of the Community can be found by listening on a content topic
derived from the public key of the Community.</li><li>Community members run their own Waku nodes,
with the configuration described in <a href="#waku-protocols">Waku-Protocols</a>.
Light nodes solely implementing
<a href="/waku/standards/core/19/lightpush">19/WAKU2-LIGHTPUSH</a>
may not be able to run their own Waku node with the configuration described.</li></ol><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="design">Design<a href="#design" class="hash-link" aria-label="Direct link to Design" title="Direct link to Design">​</a></h2><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="cryptographic-primitives">Cryptographic Primitives<a href="#cryptographic-primitives" class="hash-link" aria-label="Direct link to Cryptographic Primitives" title="Direct link to Cryptographic Primitives">​</a></h3><p>The following cryptographic primitives are used in the design -</p><ul><li>X3DH</li><li>Single Ratchet<ul><li>The single ratchet is used to encrypt the messages sent to the Community.</li><li>The single ratchet is re-keyed when a member is added/removed from the Community.</li></ul></li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="wire-format">Wire format<a href="#wire-format" class="hash-link" aria-label="Direct link to Wire format" title="Direct link to Wire format">​</a></h2><div class="language-protobuf codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-protobuf codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">syntax = &quot;proto3&quot;;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message IdentityImage {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // payload is a context based payload for the profile image data,</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // context is determined by the `source_type`</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes payload = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // source_type signals the image payload source</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> SourceType source_type = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // image_type signals the image type and method of parsing the payload</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ImageType image_type = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // encryption_keys is a list of encrypted keys that can be used to decrypt an </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // encrypted payload</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated bytes encryption_keys = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // encrypted signals the encryption state of the payload, default is false.</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool encrypted = 5;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // SourceType are the predefined types of image source allowed</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> enum SourceType {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> UNKNOWN_SOURCE_TYPE = 0;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // RAW_PAYLOAD image byte data</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> RAW_PAYLOAD = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // ENS_AVATAR uses the ENS record&#x27;s resolver get-text-data.avatar data</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The `payload` field will be ignored if ENS_AVATAR is selected</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The application will read and </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // parse the ENS avatar data as image payload data, URLs will be ignored</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The parent `ChatMessageIdentity` must have a valid `ens_name` set</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ENS_AVATAR = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">// SocialLinks represents social link associated with given chat identity (personal/community)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message SocialLink {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // Type of the social link</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string text = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // URL of the social link</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string url = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">// ChatIdentity represents identity of a community/chat</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message ChatIdentity {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // Lamport timestamp of the message</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> uint64 clock = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // ens_name is the valid ENS name associated with the chat key</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string ens_name = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // images is a string indexed mapping of images associated with an identity</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> map&lt;string, IdentityImage&gt; images = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // display name is the user set identity</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string display_name = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // description is the user set description</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string description = 5;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string color = 6;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string emoji = 7;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated SocialLink social_links = 8;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // first known message timestamp in seconds </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // (valid only for community chats for now)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // 0 - unknown</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // 1 - no messages</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> uint32 first_message_timestamp = 9;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message Grant {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // Community ID (The public key of the community)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes community_id = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The member ID (The public key of the member)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes member_id = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The chat for which the grant is given</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string chat_id = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The Lamport timestamp of the grant</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> uint64 clock = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message CommunityMember {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The roles a community member MAY have</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> enum Roles {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> UNKNOWN_ROLE = 0;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ROLE_ALL = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ROLE_MANAGE_USERS = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ROLE_MODERATE_CONTENT = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated Roles roles = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message CommunityPermissions {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The type of access a community MAY have</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> enum Access {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> UNKNOWN_ACCESS = 0;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> NO_MEMBERSHIP = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> INVITATION_ONLY = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ON_REQUEST = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // If the community should be available only to ens users</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool ens_only = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // If the community is private</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool private = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Access access = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message CommunityAdminSettings {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // If the Community admin may pin messages</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool pin_message_all_members_enabled = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message CommunityChat {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // A map of members in the community to their roles in a chat</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> map&lt;string,CommunityMember&gt; members = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The permissions of the chat</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> CommunityPermissions permissions = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The metadata of the chat</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ChatIdentity identity = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The category of the chat</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string category_id = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The position of chat in the display</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> int32 position = 5;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message CommunityCategory {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The category id </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string category_id = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The name of the category</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string name = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The position of the category in the display</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> int32 position = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message CommunityInvitation {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // Encrypted/unencrypted community description</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes community_description = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The grant offered by the community</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes grant = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The chat id requested to join</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string chat_id = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The public key of the community</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes public_key = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message CommunityRequestToJoin {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The Lamport timestamp of the request </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> uint64 clock = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The ENS name of the requester</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string ens_name = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The chat id requested to join</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string chat_id = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The public key of the community</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes community_id = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The display name of the requester</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string display_name = 5;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message CommunityCancelRequestToJoin {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The Lamport timestamp of the request</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> uint64 clock = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The ENS name of the requester</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string ens_name = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The chat id requested to join</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string chat_id = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The public key of the community</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes community_id = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The display name of the requester</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string display_name = 5;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // Magnet uri for community history protocol</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> string magnet_uri = 6;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message CommunityRequestToJoinResponse {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The Lamport timestamp of the request</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> uint64 clock = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The community description</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> CommunityDescription community = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // If the request was accepted</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool accepted = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The grant offered by the community</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes grant = 4;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The community public key</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes community_id = 5;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message CommunityRequestToLeave {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The Lamport timestamp of the request</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> uint64 clock = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The community public key</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bytes community_id = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">message CommunityDescription {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The Lamport timestamp of the message</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> uint64 clock = 1;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // A mapping of members in the community to their roles</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> map&lt;string,CommunityMember&gt; members = 2;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The permissions of the Community</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> CommunityPermissions permissions = 3;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The metadata of the Community</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> ChatIdentity identity = 5;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // A mapping of chats to their details</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> map&lt;string,CommunityChat&gt; chats = 6;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // A list of banned members</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated string ban_list = 7;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // A mapping of categories to their details</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> map&lt;string,CommunityCategory&gt; categories = 8;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The admin settings of the Community</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> CommunityAdminSettings admin_settings = 10;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // If the community is encrypted</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> bool encrypted = 13;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // The list of tags</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> repeated string tags = 14;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><p>Note: The usage of the clock is described in the <a href="#clock">Clock</a> section.</p><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="functional-scope-and-shard-assignment">Functional scope and shard assignment<a href="#functional-scope-and-shard-assignment" class="hash-link" aria-label="Direct link to Functional scope and shard assignment" title="Direct link to Functional scope and shard assignment">​</a></h3><p>We define two special <a href="/status/raw/status-app-protocols##functional-scope">functional scopes</a> for messages related to Status Communities:</p><ol><li>Global community control</li><li>Global community content</li></ol><p>All messages that relate to controlling communities MUST be assigned the <em>global community control</em> scope.
All messages that carry user-generated content for communities MUST be assigned the <em>global community content</em> scope.</p><p>&gt; <strong>Note:</strong> a previous iteration of Status Communities defined separate community-wide scopes for each community.
However, this model was deprecated and all communities now operate on a global, shared scope.
This implies that different communities will share shards on the routing layer.</p><p>The following <a href="/status/raw/status-app-protocols##waku-transport-layer">Waku transport layer</a> allocations are reserved for communities:
As per <a href="https://rfc.vac.dev/status/raw/simple-scaling/#relay-shards" target="_blank" rel="noopener noreferrer">STATUS-SIMPLE-SCALING</a>, communities use the default cluster ID <code>16</code>
set aside for all Status app protocols.
Within this cluster, the following <a href="/status/raw/status-app-protocols##pubsub-topics-and-sharding">shards</a> are reserved for the community functional scopes:</p><ol><li>All messages with a <em>global community control</em> scope MUST be published to shard <code>128</code></li><li>All messages with a <em>global community content</em> scope MUST be published to shard <code>256</code></li></ol><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="content-topic-level-encryption">Content topic level encryption<a href="#content-topic-level-encryption" class="hash-link" aria-label="Direct link to Content topic level encryption" title="Direct link to Content topic level encryption">​</a></h3><p>-a universal chat identifier is used for all community chats.</p><p>All messages are encrypted before they are handed over to waku ir-respective of the encryption explained above.
All community chats are encrypted using a symmetric key generated from universal chat id using pbkdf2.</p><div class="language-js codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-js codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">symKey </span><span class="token operator">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">pbkdf2</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">password</span><span class="token operator">:</span><span class="token plain">universalChatID</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token literal-property property">salt</span><span class="token operator">:</span><span class="token plain">nil</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> iteration</span><span class="token operator">-</span><span class="token plain">count</span><span class="token operator">:</span><span class="token number">65356</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain">key</span><span class="token operator">-</span><span class="token plain">length</span><span class="token operator">:</span><span class="token number">32</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> hash</span><span class="token operator">-</span><span class="token plain">func</span><span class="token operator">:</span><span class="token plain"> random</span><span class="token operator">-</span><span class="token plain">sha256</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="content-topic-usage">Content topic usage<a href="#content-topic-usage" class="hash-link" aria-label="Direct link to Content topic usage" title="Direct link to Content topic usage">​</a></h3><p>&quot;Content topic&quot; refers to the field in <a href="/waku/standards/core/14/message#message-attributes">14/WAKU2-MESSAGE</a>,
further elaborated in <a href="/waku/standards/core/10/waku2#overview-of-protocol-interaction">10/WAKU2</a>.
The content-topic usage follows the guidelines specified at <a href="/waku/informational/23/topics##content-topic-usage-guidelines">23/topics</a></p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="advertising-a-community">Advertising a Community<a href="#advertising-a-community" class="hash-link" aria-label="Direct link to Advertising a Community" title="Direct link to Advertising a Community">​</a></h4><p>The content topic that the community is advertised on
MUST be derived from the public key of the community.
The content topic MUST be the first four bytes of the keccak-256 hash
of the compressed (33 bytes) public key of the community encoded into a hex string.</p><div class="language-js codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-js codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">hash </span><span class="token operator">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">hex</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token function" style="color:rgb(80, 250, 123)">keccak256</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token function" style="color:rgb(80, 250, 123)">encodeToHex</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">compressedPublicKey</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">topicLen </span><span class="token operator">=</span><span class="token plain"> </span><span class="token number">4</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword control-flow" style="color:rgb(189, 147, 249);font-style:italic">if</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">len</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">&lt;</span><span class="token plain"> topicLen </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> topicLen </span><span class="token operator">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">len</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">var</span><span class="token plain"> topic </span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token number">4</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain">byte</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword control-flow" style="color:rgb(189, 147, 249);font-style:italic">for</span><span class="token plain"> i </span><span class="token operator">=</span><span class="token plain"> </span><span class="token number">0</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"> i </span><span class="token operator">&lt;</span><span class="token plain"> topicLen</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"> i</span><span class="token operator">++</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> topic</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">i</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">i</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">contentTopic </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;/waku/1/0x&quot;</span><span class="token plain"> </span><span class="token operator">+</span><span class="token plain"> topic </span><span class="token operator">+</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;/rfc26&quot;</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="community-event-messages">Community event messages<a href="#community-event-messages" class="hash-link" aria-label="Direct link to Community event messages" title="Direct link to Community event messages">​</a></h4><p>Message such as community description
MUST be sent to the content topic derived from the public key of the community.
The content topic
MUST be the hex-encoded keccak-256 hash of the public key of the community.</p><div class="language-js codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-js codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">hash </span><span class="token operator">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">hex</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token function" style="color:rgb(80, 250, 123)">keccak256</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token function" style="color:rgb(80, 250, 123)">encodeToHex</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">publicKey</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">topicLen </span><span class="token operator">=</span><span class="token plain"> </span><span class="token number">4</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword control-flow" style="color:rgb(189, 147, 249);font-style:italic">if</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">len</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">&lt;</span><span class="token plain"> topicLen </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> topicLen </span><span class="token operator">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">len</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">var</span><span class="token plain"> topic </span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token number">4</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain">byte</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword control-flow" style="color:rgb(189, 147, 249);font-style:italic">for</span><span class="token plain"> i </span><span class="token operator">=</span><span class="token plain"> </span><span class="token number">0</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"> i </span><span class="token operator">&lt;</span><span class="token plain"> topicLen</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"> i</span><span class="token operator">++</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> topic</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">i</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">i</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">contentTopic </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;/waku/1/0x&quot;</span><span class="token plain"> </span><span class="token operator">+</span><span class="token plain"> topic </span><span class="token operator">+</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;/rfc26&quot;</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="community-requests">Community Requests<a href="#community-requests" class="hash-link" aria-label="Direct link to Community Requests" title="Direct link to Community Requests">​</a></h4><p>Requests to leave, join, kick and ban, as well as key exchange messages, MUST be sent to the content topic derived from the public key of the community on the common shard.</p><p>The content topic
MUST be the keccak-256 hash of hex-encoded universal chat id (public key appended with fixed string) of the community omitting the first 2 bytes.</p><div class="language-js codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-js codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">universalChatId </span><span class="token operator">=</span><span class="token plain"> publicKey</span><span class="token operator">+</span><span class="token string" style="color:rgb(255, 121, 198)">&quot;-memberUpdate&quot;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hash </span><span class="token operator">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">hex</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token function" style="color:rgb(80, 250, 123)">keccak256</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token function" style="color:rgb(80, 250, 123)">encodeToHex</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">universalChatId</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token number">2</span><span class="token operator">:</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">topicLen </span><span class="token operator">=</span><span class="token plain"> </span><span class="token number">4</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword control-flow" style="color:rgb(189, 147, 249);font-style:italic">if</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">len</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">&lt;</span><span class="token plain"> topicLen </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> topicLen </span><span class="token operator">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">len</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">var</span><span class="token plain"> topic </span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token number">4</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain">byte</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword control-flow" style="color:rgb(189, 147, 249);font-style:italic">for</span><span class="token plain"> i </span><span class="token operator">=</span><span class="token plain"> </span><span class="token number">0</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"> i </span><span class="token operator">&lt;</span><span class="token plain"> topicLen</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"> i</span><span class="token operator">++</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> topic</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">i</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">i</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">contentTopic </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;/waku/1/0x&quot;</span><span class="token plain"> </span><span class="token operator">+</span><span class="token plain"> topic </span><span class="token operator">+</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;/rfc26&quot;</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="community-shard-info">Community Shard Info<a href="#community-shard-info" class="hash-link" aria-label="Direct link to Community Shard Info" title="Direct link to Community Shard Info">​</a></h4><p>If a community is assigned a dedicated shard then the shard info for that community is published on a content topic derived from a specialized key. This is useful for users joining the new community so that they can subscribe to this specific content topic.</p><div class="language-js codeBlockContainer_EB2s codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:rgba(var(--lsd-surface-secondary), 0.08)"><div class="codeBlockContent_ugSV"><pre tabindex="0" class="prism-code language-js codeBlock_TWhw thin-scrollbar"><code class="codeBlockLines_LDrR"><span class="token-line" style="color:#F8F8F2"><span class="token plain">chatID </span><span class="token operator">=</span><span class="token plain"> publicKey</span><span class="token operator">+</span><span class="token string" style="color:rgb(255, 121, 198)">&quot;-shard-info&quot;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hash </span><span class="token operator">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">hex</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token function" style="color:rgb(80, 250, 123)">keccak256</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token function" style="color:rgb(80, 250, 123)">encodeToHex</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">chatID</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token number">2</span><span class="token operator">:</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">topicLen </span><span class="token operator">=</span><span class="token plain"> </span><span class="token number">4</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword control-flow" style="color:rgb(189, 147, 249);font-style:italic">if</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">len</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token operator">&lt;</span><span class="token plain"> topicLen </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> topicLen </span><span class="token operator">=</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">len</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">var</span><span class="token plain"> topic </span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token number">4</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain">byte</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword control-flow" style="color:rgb(189, 147, 249);font-style:italic">for</span><span class="token plain"> i </span><span class="token operator">=</span><span class="token plain"> </span><span class="token number">0</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"> i </span><span class="token operator">&lt;</span><span class="token plain"> topicLen</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"> i</span><span class="token operator">++</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> topic</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">i</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"> hash</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">i</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">contentTopic </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;/waku/1/0x&quot;</span><span class="token plain"> </span><span class="token operator">+</span><span class="token plain"> topic </span><span class="token operator">+</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;/rfc26&quot;</span><br></span></code></pre><div class="buttonGroup_Qu4e"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_an20" aria-hidden="true"><div class="icon_S7Kx m_thRi copyButtonIcon_ZL7v"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M2.917 12.833c-.321 0-.596-.114-.825-.343a1.121 1.121 0 0 1-.342-.823V3.5h1.167v8.167h6.416v1.166H2.917ZM5.25 10.5c-.32 0-.596-.114-.824-.343a1.121 1.121 0 0 1-.343-.824v-7c0-.32.115-.595.343-.824.229-.229.504-.343.824-.342h5.25c.32 0 .596.114.824.343.229.228.343.503.343.823v7c0 .321-.115.596-.343.825a1.121 1.121 0 0 1-.824.342H5.25Zm0-1.167h5.25v-7H5.25v7Z" fill="#fff"></path></svg></div></span></button></div></div></div><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="community-channelschats">Community channels/chats<a href="#community-channelschats" class="hash-link" aria-label="Direct link to Community channels/chats" title="Direct link to Community channels/chats">​</a></h4><p>All channels/chats shall use a single content-topic which is derived from a universal chat id irrespective of their individual unique chat ids.</p><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="community-management">Community Management<a href="#community-management" class="hash-link" aria-label="Direct link to Community Management" title="Direct link to Community Management">​</a></h3><p>The flows for Community management are as described below.</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="community-creation-flow">Community Creation Flow<a href="#community-creation-flow" class="hash-link" aria-label="Direct link to Community Creation Flow" title="Direct link to Community Creation Flow">​</a></h4><ol><li>The Community owner generates a public/private key pair.</li><li>The Community owner configures the Community metadata,
according to the wire format &quot;CommunityDescription&quot;.</li><li>The Community owner publishes the Community metadata on a content topic
derived from the public key of the Community.
the Community metadata SHOULD be encrypted with the public key of the Community.
The Community metadata is sent during fixed intervals,
to ensure that the Community metadata is available to members.
The Community metadata SHOULD be sent every time the Community metadata is updated.</li><li>The Community owner MAY advertise the Community out of band,
by sharing the public key of the Community on other mediums of communication.</li></ol><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="community-join-flow-peer-requests-to-join-a-community">Community Join Flow (peer requests to join a Community)<a href="#community-join-flow-peer-requests-to-join-a-community" class="hash-link" aria-label="Direct link to Community Join Flow (peer requests to join a Community)" title="Direct link to Community Join Flow (peer requests to join a Community)">​</a></h4><ol><li>A peer and the Community owner establish a 1:1 chat as described in <a href="/status/55/1to1-chat">55/STATUS-1TO1-CHAT</a>.</li><li>The peer requests to join a Community by sending a
&quot;CommunityRequestToJoin&quot; message to the Community.
At this point, the peer MAY send a
&quot;CommunityCancelRequestToJoin&quot; message to cancel the request.</li><li>The Community owner MAY accept or reject the request.</li><li>If the request is accepted,
the Community owner sends a &quot;CommunityRequestToJoinResponse&quot; message to the peer.</li><li>The Community owner then adds the member to the Community metadata, and
publishes the updated Community metadata.</li></ol><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="community-join-flow-peer-is-invited-to-join-a-community">Community Join Flow (peer is invited to join a Community)<a href="#community-join-flow-peer-is-invited-to-join-a-community" class="hash-link" aria-label="Direct link to Community Join Flow (peer is invited to join a Community)" title="Direct link to Community Join Flow (peer is invited to join a Community)">​</a></h4><ol><li>The Community owner and peer establish a 1:1 chat as described in <a href="/status/55/1to1-chat">55/STATUS-1TO1-CHAT</a>.</li><li>The peer is invited to join a Community by the Community owner,
by sending a &quot;CommunityInvitation&quot; message.</li><li>The peer decrypts the &quot;CommunityInvitation&quot; message, and verifies the signature.</li><li>The peer requests to join a Community by sending a
&quot;CommunityRequestToJoin&quot; message to the Community.</li><li>The Community owner MAY accept or reject the request.</li><li>If the request is accepted,
the Community owner sends a &quot;CommunityRequestToJoinResponse&quot; message to the peer.</li><li>The Community owner then adds the member to the Community metadata, and
publishes the updated Community metadata.</li></ol><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="community-leave-flow">Community Leave Flow<a href="#community-leave-flow" class="hash-link" aria-label="Direct link to Community Leave Flow" title="Direct link to Community Leave Flow">​</a></h4><ol><li>A member requests to leave a Community by sending a
&quot;CommunityRequestToLeave&quot; message to the Community.</li><li>The Community owner MAY accept or reject the request.</li><li>If the request is accepted,
the Community owner removes the member from the Community metadata,
and publishes the updated Community metadata.</li></ol><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="community-ban-flow">Community Ban Flow<a href="#community-ban-flow" class="hash-link" aria-label="Direct link to Community Ban Flow" title="Direct link to Community Ban Flow">​</a></h4><ol><li>The Community owner adds a member to the ban list, revokes their grants,
and publishes the updated Community metadata.</li><li>If the Community is Private,
Re-keying is performed between the members of the Community,
to ensure that the banned member is unable to decrypt any messages.</li></ol><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="waku-protocols">Waku Protocols<a href="#waku-protocols" class="hash-link" aria-label="Direct link to Waku Protocols" title="Direct link to Waku Protocols">​</a></h3><p>The following Waku protocols SHOULD be used to implement Status Communities -</p><ol><li><a href="/waku/standards/core/11/relay">11/WAKU2-RELAY</a> -
To send and receive messages</li><li><a href="/waku/standards/application/53/x3dh">53/WAKU2-X3DH</a> -
To encrypt and decrypt messages</li><li><a href="/waku/standards/application/54/x3dh-sessions">54/WAKU2-X3DH-SESSIONS</a>-
To handle session keys</li><li><a href="/waku/standards/core/14/message">14/WAKU2-MESSAGE</a> -
To wrap community messages in a Waku message</li><li><a href="/waku/standards/core/13/store">13/WAKU2-STORE</a> -
To store and retrieve messages for offline devices</li></ol><p>The following Waku protocols MAY be used to implement Status Communities -</p><ol><li><a href="/waku/standards/core/12/filter">12/WAKU2-FILTER</a> -
Content filtering for resource restricted devices</li><li><a href="/waku/standards/core/19/lightpush">19/WAKU2-LIGHTPUSH</a> -
Allows Light clients to participate in the network</li></ol><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="backups">Backups<a href="#backups" class="hash-link" aria-label="Direct link to Backups" title="Direct link to Backups">​</a></h3><p>The member MAY back up their local settings,
by encrypting it with their public key, and
sending it to a given content topic.
The member MAY then rely on this backup to restore their local settings,
in case of a data loss.
This feature relies on
<a href="/waku/standards/core/13/store">13/WAKU2-STORE</a>
for storing and retrieving messages.</p><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="clock">Clock<a href="#clock" class="hash-link" aria-label="Direct link to Clock" title="Direct link to Clock">​</a></h3><p>The clock used in the wire format refers to the Lamport timestamp of the message.
The Lamport timestamp is a logical clock that is used to determine the order of events
in a distributed system.
This allows ordering of messages in an asynchronous network
where messages may be received out of order.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="security-considerations">Security Considerations<a href="#security-considerations" class="hash-link" aria-label="Direct link to Security Considerations" title="Direct link to Security Considerations">​</a></h2><ol><li><p>The Community owner is a single point of failure.
If the Community owner is compromised, the Community is compromised.</p></li><li><p>Follows the same security considerations as the
<a href="/waku/standards/application/53/x3dh">53/WAKU2-X3DH</a> protocol.</p></li></ol><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="future-work">Future work<a href="#future-work" class="hash-link" aria-label="Direct link to Future work" title="Direct link to Future work">​</a></h2><ol><li><p>To scale and optimize the Community management,
the Community metadata should be stored on a decentralized storage system, and
only the references to the Community metadata should be broadcasted.
The following document describes this method in more detail -
<a href="https://hackmd.io/rD1OfIbJQieDe3GQdyCRTw" target="_blank" rel="noopener noreferrer">Optimizing the <code>CommunityDescription</code> dissemination</a></p></li><li><p>Token gating for communities</p></li><li><p>Sharding the content topic used for <a href="#community-event-messages">#Community Event Messages</a>,
since members of the community don&#x27;t need to receive all the control messages.</p></li></ol><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="copyright">Copyright<a href="#copyright" class="hash-link" aria-label="Direct link to Copyright" title="Direct link to Copyright">​</a></h2><p>Copyright and related rights waived via <a href="https://creativecommons.org/publicdomain/zero/1.0/" target="_blank" rel="noopener noreferrer">CC0</a>.</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="references">References<a href="#references" class="hash-link" aria-label="Direct link to References" title="Direct link to References">​</a></h2><ul><li><a href="/status/55/1to1-chat">55/STATUS-1TO1-CHAT</a></li><li><a href="/waku/standards/application/53/x3dh">53/WAKU2-X3DH</a></li><li><a href="/waku/standards/core/19/lightpush">19/WAKU2-LIGHTPUSH</a></li><li><a href="/waku/standards/core/14/message">14/WAKU2-MESSAGE</a></li><li><a href="/waku/standards/core/10/waku2">10/WAKU2</a></li><li><a href="/waku/standards/core/11/relay">11/WAKU2-RELAY</a></li><li><a href="/waku/standards/application/54/x3dh-sessions">54/WAKU2-X3DH-SESSIONS</a></li><li><a href="/waku/standards/core/13/store">13/WAKU2-STORE</a></li><li><a href="/waku/standards/core/12/filter">12/WAKU2-FILTER</a></li></ul><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="informative">informative<a href="#informative" class="hash-link" aria-label="Direct link to informative" title="Direct link to informative">​</a></h3><ul><li><a href="https://github.com/status-im/status-go/blob/6072bd17ab1e5d9fc42cf844fcb8ad18aa07760c/protocol/communities/community.go" target="_blank" rel="noopener noreferrer">community.go</a></li><li><a href="https://github.com/status-im/specs/blob/403b5ce316a270565023fc6a1f8dec138819f4b0/docs/raw/organisation-channels.md" target="_blank" rel="noopener noreferrer">organisation-channels.md</a></li></ul></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/status/55/1to1-chat"><div class="icon_S7Kx m_thRi"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="M11.667 6.417h-7.1l3.261-3.261L7 2.333 2.333 7 7 11.667l.823-.823-3.255-3.26h7.099V6.417Z" fill="#fff"></path></svg></div><span class="lsd-typography lsd-typography--body2 pagination-nav__label">55/STATUS-1TO1-CHAT</span></a><a class="pagination-nav__link pagination-nav__link--next" href="/status/61/community-history-service"><span class="lsd-typography lsd-typography--body2 pagination-nav__label">61/STATUS-Community-History-Service</span><div class="icon_S7Kx m_thRi"><svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg" role="img"><path d="m7 2.333-.823.823 3.255 3.26H2.333v1.167h7.1l-3.256 3.261.823.823L11.667 7 7 2.333Z" 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href="#functional-scope-and-shard-assignment" class="table-of-contents__link toc-highlight">Functional scope and shard assignment</a></li><li><a href="#content-topic-level-encryption" class="table-of-contents__link toc-highlight">Content topic level encryption</a></li><li><a href="#content-topic-usage" class="table-of-contents__link toc-highlight">Content topic usage</a></li><li><a href="#community-management" class="table-of-contents__link toc-highlight">Community Management</a></li><li><a href="#waku-protocols" class="table-of-contents__link toc-highlight">Waku Protocols</a></li><li><a href="#backups" class="table-of-contents__link toc-highlight">Backups</a></li><li><a href="#clock" class="table-of-contents__link toc-highlight">Clock</a></li></ul></li><li><a href="#security-considerations" class="table-of-contents__link toc-highlight">Security Considerations</a></li><li><a href="#future-work" class="table-of-contents__link toc-highlight">Future work</a></li><li><a href="#copyright" 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