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Installing oidentd is necessary if you're providing a public bouncer. Ident helps ensure that a user of your bouncer can always be uniquely identified, making it easier to ban that user and prevent abuse.

You may want to consult znc's wiki as a reference.

First, we install oidentd:

$ doas pkg_add oidentd

Afterwards, inside /etc/rc.local, we put the following:

if [ -x /usr/local/sbin/oidentd ]; then
        echo -n ' oidentd';     /usr/local/sbin/oidentd -a :: -u _identd -g _identd
fi

This ensures that oident starts at bootup and runs as the user and group _identd.

Put this inside /etc/oidentd.conf to spoof ident replies:

user "znc" {
    default {
        allow spoof
        allow spoof_all
    }
}

Make sure the identfile module is loaded on znc.

We need to create ~/.oidentd.conf inside the home folder for znc that oidentd will read from to spoof ident replies. This is made more tricky by the fact that znc runs inside a chroot:

$ doas touch /home/znc/.oidentd.conf
$ doas ln -s /home/znc/.oidentd.conf /home/znc/home/znc/.oidentd.conf
$ chmod 664 /home/znc/.oidentd.conf /home/znc/home/znc/.oidentd.conf
$ chown znc:znc /home/znc/.oidentd.conf /home/znc/home/znc/.oidentd.conf

ZNC's identfile module will help write to /home/znc/home/znc/.oidentd.conf, which in turn is symlinked to /home/znc/.oidentd.conf . This latter file is what oidentd reads from.