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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.

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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.

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