* You can then manually inspect these user accounts or send them a message to not mine to the exchange
* The [rescan](https://faq.hush.is/rpc/rescan.html) RPC in Hush 3.9.1 can be used to rescan from any block height, which minimizes downtime.
* Example usage: `hush-cli rescan 123456`
* Another important way to minimize downtime is the use the `-keepnotewitnesscache` option to hushd, for instance:
* The `rescan` RPC will use the existing note witness cache, which is described below.
* Another important way to minimize downtime when restarting hushd is the use the `-keepnotewitnesscache` option to hushd, for instance:
* `hushd -keepnotewitnesscache -rescanheight 123456` will greatly speed up rescanning by only updating the Sapling zaddr witness cache instead of calculating it from scratch
* It's best to only send payouts a few times per day (such as 2 or 3) instead of when they are above a threshold.
* This will make pool wallets smaller and faster, miner wallets smaller and faster, and exchange wallets smaller and faster (because miners often mine directly to pools)
