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<div class="dev_page_bread_crumbs"><ul class="breadcrumb clearfix"><li><a href="/api" >API</a></li><i class="icon icon-breadcrumb-divider"></i><li><a href="/api/factcheck" >Fact-checks</a></li></ul></div>
<h1 id="dev_page_title">Fact-checks</h1>
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<p>Telegram clients support displaying fact-checks added to messages by independent fact-checkers.</p>
<h3><a class="anchor" href="#displaying-fact-checks" id="displaying-fact-checks" name="displaying-fact-checks"><i class="anchor-icon"></i></a>Displaying fact-checks</h3>
<pre><code><a href='/constructor/factCheck'>factCheck</a>#b89bfccf flags:<a href='/type/%23'>#</a> need_check:flags.0?<a href='/constructor/true'>true</a> country:flags.1?<a href='/type/string'>string</a> text:flags.1?<a href='/type/TextWithEntities'>TextWithEntities</a> hash:<a href='/type/long'>long</a> = <a href='/type/FactCheck'>FactCheck</a>;
<a href='/constructor/message'>message</a>#94345242 flags:<a href='/type/%23'>#</a> out:flags.1?<a href='/constructor/true'>true</a> mentioned:flags.4?<a href='/constructor/true'>true</a> media_unread:flags.5?<a href='/constructor/true'>true</a> silent:flags.13?<a href='/constructor/true'>true</a> post:flags.14?<a href='/constructor/true'>true</a> from_scheduled:flags.18?<a href='/constructor/true'>true</a> legacy:flags.19?<a href='/constructor/true'>true</a> edit_hide:flags.21?<a href='/constructor/true'>true</a> pinned:flags.24?<a href='/constructor/true'>true</a> noforwards:flags.26?<a href='/constructor/true'>true</a> invert_media:flags.27?<a href='/constructor/true'>true</a> flags2:<a href='/type/%23'>#</a> offline:flags2.1?<a href='/constructor/true'>true</a> id:<a href='/type/int'>int</a> from_id:flags.8?<a href='/type/Peer'>Peer</a> from_boosts_applied:flags.29?<a href='/type/int'>int</a> peer_id:<a href='/type/Peer'>Peer</a> saved_peer_id:flags.28?<a href='/type/Peer'>Peer</a> fwd_from:flags.2?<a href='/type/MessageFwdHeader'>MessageFwdHeader</a> via_bot_id:flags.11?<a href='/type/long'>long</a> via_business_bot_id:flags2.0?<a href='/type/long'>long</a> reply_to:flags.3?<a href='/type/MessageReplyHeader'>MessageReplyHeader</a> date:<a href='/type/int'>int</a> message:<a href='/type/string'>string</a> media:flags.9?<a href='/type/MessageMedia'>MessageMedia</a> reply_markup:flags.6?<a href='/type/ReplyMarkup'>ReplyMarkup</a> entities:flags.7?<a href='/type/Vector%20t'>Vector</a>&lt;<a href='/type/MessageEntity'>MessageEntity</a>&gt; views:flags.10?<a href='/type/int'>int</a> forwards:flags.10?<a href='/type/int'>int</a> replies:flags.23?<a href='/type/MessageReplies'>MessageReplies</a> edit_date:flags.15?<a href='/type/int'>int</a> post_author:flags.16?<a href='/type/string'>string</a> grouped_id:flags.17?<a href='/type/long'>long</a> reactions:flags.20?<a href='/type/MessageReactions'>MessageReactions</a> restriction_reason:flags.22?<a href='/type/Vector%20t'>Vector</a>&lt;<a href='/type/RestrictionReason'>RestrictionReason</a>&gt; ttl_period:flags.25?<a href='/type/int'>int</a> quick_reply_shortcut_id:flags.30?<a href='/type/int'>int</a> effect:flags2.2?<a href='/type/long'>long</a> factcheck:flags2.3?<a href='/type/FactCheck'>FactCheck</a> = <a href='/type/Message'>Message</a>;
---functions---
<a href='/method/messages.getFactCheck'>messages.getFactCheck</a>#b9cdc5ee peer:<a href='/type/InputPeer'>InputPeer</a> msg_id:<a href='/type/Vector%20t'>Vector</a>&lt;<a href='/type/int'>int</a>&gt; = <a href='/type/Vector%20t'>Vector</a>&lt;<a href='/type/FactCheck'>FactCheck</a>&gt;;</code></pre>
<p>Fact-checks are represented by <a href="/constructor/factCheck">factCheck</a> constructors, contained in the <code>factcheck</code> field of the <a href="/constructor/message">message</a> constructor. </p>
<p>Sometimes (i.e. for performance reasons), even if a message <em>does</em> have a factcheck, it may not be returned in the <code>text</code> field of the <a href="/constructor/factCheck">factCheck</a> associated to the <a href="/constructor/message">message</a>: in this case, the <a href="/constructor/factCheck">factCheck</a>.<code>need_check</code> flag will be set and the <code>country</code>/<code>text</code> flags won't be set, and the client should request the full text of the fact check manually using <a href="/method/messages.getFactCheck">messages.getFactCheck</a> when the message scrolls into view. </p>
<p>These manual requests should be bundled: every time a new ID is added to the queue of factchecks to manually fetch, postpone fetching by 80ms. </p>
<p>Store all <em>full</em> (i.e. those with a <code>country</code>/<code>text</code>) factchecks in a local database, using the <code>hash</code> as key.<br>
Avoid fetching <em>min</em> (i.e. those where <code>need_check</code> is set) factchecks if a factcheck with the same <code>hash</code> is already cached in the local database. </p>
<p>Example implementation: <a href="https://github.com/DrKLO/Telegram/blob/5fa5549a4a7f48476be29cc0facf68990ea10f62/TMessagesProj/src/main/java/org/telegram/messenger/FactCheckController.java">android</a>.</p>
<h3><a class="anchor" href="#editing-fact-checks" id="editing-fact-checks" name="editing-fact-checks"><i class="anchor-icon"></i></a>Editing fact-checks</h3>
<pre><code><a href='/constructor/factCheck'>factCheck</a>#b89bfccf flags:<a href='/type/%23'>#</a> need_check:flags.0?<a href='/constructor/true'>true</a> country:flags.1?<a href='/type/string'>string</a> text:flags.1?<a href='/type/TextWithEntities'>TextWithEntities</a> hash:<a href='/type/long'>long</a> = <a href='/type/FactCheck'>FactCheck</a>;
---functions---
<a href='/method/messages.editFactCheck'>messages.editFactCheck</a>#0589ee75 peer:<a href='/type/InputPeer'>InputPeer</a> msg_id:<a href='/type/int'>int</a> text:<a href='/type/TextWithEntities'>TextWithEntities</a> = <a href='/type/Updates'>Updates</a>;
<a href='/method/messages.deleteFactCheck'>messages.deleteFactCheck</a>#d1da940c peer:<a href='/type/InputPeer'>InputPeer</a> msg_id:<a href='/type/int'>int</a> = <a href='/type/Updates'>Updates</a>;</code></pre>
<p>Fact-checks may be created, deleted and edited by independent fact-checkers using <a href="/method/messages.editFactCheck">messages.editFactCheck</a> and <a href="/method/messages.deleteFactCheck">messages.deleteFactCheck</a>. </p>
<p>Those methods can be used by independent fact-checkers, which will have the <a href="/api/config#can-edit-factcheck">appConfig.can_edit_factcheck</a> configuration flag set to <code>true</code>. </p>
<p>If the flag mentioned above is set to <code>true</code>, the maximum UTF-8 length for a fact check will be specified in the <a href="/api/config#factcheck-length-limit">appConfig.factcheck_length_limit</a> field.</p></div>
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