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	<title>Timed events - Revision history</title>
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	<updated>2026-05-13T05:29:46Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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		<id>https://mojopuzzler.org/mediawiki/index.php?title=Timed_events&amp;diff=2457&amp;oldid=prev</id>
		<title>Gneale: Created page with &quot;==== Return to: Insightful_Comments ==== Keybase 20211021:  Q : Hi there, a friend and I are wanting to develop a project on Chia as part of our dissertation at university, we wanted to know if timed events/conditions are possible/easy to do?  A (Quexington): You can assert that a certain time/block height has passed if you'd like but you cannot assert that a certain time/block height has not passed.  If you want to lock a spend until a certain time, you can do that....&quot;</title>
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		<updated>2023-11-18T02:03:19Z</updated>

		<summary type="html">&lt;p&gt;Created page with &amp;quot;==== Return to: &lt;a href=&quot;/mediawiki/index.php/Insightful_Comments&quot; title=&quot;Insightful Comments&quot;&gt;Insightful_Comments&lt;/a&gt; ==== Keybase 20211021:  Q : Hi there, a friend and I are wanting to develop a project on Chia as part of our dissertation at university, we wanted to know if timed events/conditions are possible/easy to do?  A (Quexington): You can assert that a certain time/block height has passed if you&amp;#039;d like but you cannot assert that a certain time/block height has not passed.  If you want to lock a spend until a certain time, you can do that....&amp;quot;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;==== Return to: [[Insightful_Comments]] ====&lt;br /&gt;
Keybase 20211021:&lt;br /&gt;
&lt;br /&gt;
Q : Hi there, a friend and I are wanting to develop a project on Chia as part of our dissertation at university, we wanted to know if timed events/conditions are possible/easy to do?&lt;br /&gt;
&lt;br /&gt;
A (Quexington): You can assert that a certain time/block height has passed if you'd like but you cannot assert that a certain time/block height has not passed.&lt;br /&gt;
&lt;br /&gt;
If you want to lock a spend until a certain time, you can do that. If you want to lock a spend at a certain time, you cannot do that.  Spends only become valid, not invalid.&lt;br /&gt;
&lt;br /&gt;
One more thing to note is that you could get close to the &amp;quot;spend becomes invalid&amp;quot; behavior by having a spend path that allows anyone to spend the coin to some predetermined puzzle.  Watchers can watch the blockchain and purposefully go brick those coins that have &amp;quot;expired&amp;quot;&lt;/div&gt;</summary>
		<author><name>Gneale</name></author>
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