user127799: If I have a wallet where I've imported someone's address "A" as a watch-only address, and I run listsinceblock (the specific parameters may be irrelevant to this question), would I be able to see the coinbase transactions where the output was "A"?

user-1: 
Does listsinceblock show coinbase transactions on a watch-only address?

Yes. You can use include_watchonly argument in listsinceblock
include_watchonly: boolean, optional, default=true for watch-only wallets, otherwise false. Includes transactions to watch-only addresses (see importaddress)

127799: <p>If I have a wallet where I've imported someone's address &quot;A&quot; as a watch-only address, and I run <code>listsinceblock</code> (the specific parameters may be irrelevant to this question), would I be able to see the coinbase transactions where the output was &quot;A&quot;?</p>
 -1: <blockquote>
<p>Does <code>listsinceblock</code> show coinbase transactions on a watch-only address?</p>
</blockquote>
<p>Yes. You can use <code>include_watchonly</code> argument in <a href="https://bitcoincore.org/en/doc/0.21.0/rpc/wallet/listsinceblock/" rel="nofollow noreferrer"><code>listsinceblock</code></a></p>
<p><code>include_watchonly</code>: boolean, optional, default=true for watch-only wallets, otherwise false. Includes transactions to watch-only addresses (see <code>importaddress</code>)</p>
