user56769: Can I import newly generated address to Bitcoin core with "importaddress" rescan false, for the watch only purpose?
why do I need to rescan if the address doesn't have any history?
Question: will it trigger the "walletnotify" if it receives new transaction on that address without rescanning.

user208: 
why do I need to rescan if the address doesn't have any history?

It does not know it has no history until it completes the rescan.
You can either pass a false as extra argument (look up the importaddress documentation), or use the more powerful importmulti command with a recent birth time.

56769: <p>Can I import newly generated address to Bitcoin core with "importaddress" rescan false, for the watch only purpose?</p>

<p>why do I need to rescan if the address doesn't have any history?</p>

<p>Question: will it trigger the "walletnotify" if it receives new transaction on that address without rescanning.</p>
 208: <blockquote>
  <p>why do I need to rescan if the address doesn't have any history?</p>
</blockquote>

<p>It does not know it has no history until it completes the rescan.</p>

<p>You can either pass a <code>false</code> as extra argument (look up the <code>importaddress</code> documentation), or use the more powerful <code>importmulti</code> command with a recent birth time.</p>
