What are bitcoin/altcoin block notifications? While setting up a private nomp mining pool as a learning project, The instructions recommended setting up block notify. What are block notifications?
The -blocknotify="{cmd}" is one of the configurable settings when starting the bitcoin daemon. For example, I can start my bitcoind with this command:

bitcoind -blocknotify='echo %s'


And when a new block is solved, the block hash gets printed.

00000000000000000e979c4a51dc6cb9606e47a2b499f591645f53fe801ae374