<p>If two programs both want to use the same bitcoin core instance to get notified about new blocks, do you add <code>zmqpubhashblock=&lt;address&gt;</code> <em>twice</em> to bitcoin.conf with two different port numbers, one for each program?</p>
<p>I have some &quot;Meta&quot; questions about this question too:</p>
<p>I suppose the answer to this question already exists somewhere and I spent some time trying to find it but failed.  What keywords would you use in a search engine to find the answer if it already exists online?  Is there a site where you'd expect this question to already have an answer, and if so, how would you find it?</p>

<bitcoin-core><bitcoin.conf><zeromq><learning>
Does bitcoin.conf allow multiple zmqpubhashblock settings?
Dave Scotese
# Does bitcoin.conf allow multiple zmqpubhashblock settings?

(Asked by: username_0 on 2021-10-09)

If two programs both want to use the same bitcoin core instance to get notified about new blocks, do you add `zmqpubhashblock=` *twice* to bitcoin.conf with two different port numbers, one for each program?

I have some "Meta" questions about this question too:

I suppose the answer to this question already exists somewhere and I spent some time trying to find it but failed. What keywords would you use in a search engine to find the answer if it already exists online? Is there a site where you'd expect this question to already have an answer, and if so, how would you find it?

**Tags:** bitcoin-core, bitcoin.conf, zeromq, learning


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