The equivalent to a bootstrap node is the pub to which you used an invite code to connect to when joining the network (unless you connect to the network in a di

The equivalent to a bootstrap node is the pub to which you used an invite code to connect to when joining the network (unless you connect to the network in a different way, like by being followed by someone else on your LAN). When you use an invite code, you publish a message with the pub's address on your feed. When peers replicate your feed, they see those messages, and thereby find out about new pubs to connect to.