you can also add contacts remotely, you need to exchange your briar links on a different channel. It's safe to post your link publicly. Only if both parties add each other's links within the app, you will be able to communicate. Post you own link here and add mine: briar://aagcagf7vews5wtz4kpzzy76vpv2r65mlwqlm6a627tvr6bkf75em