I'm new to lines, and have been following some of the recent discussion about the netlabel.
I had actually explored CASHmusic.js a while back. I happened upon it and thought the interactive audio players were a really cool idea. I did not get very far (no fault of cash, I'm just terrible at following-through on personal projects)...just got the local dev environment set up and some random mp3 files playing and pausing with one of their basic-interface players.
I decided to explore a little bit more this evening to get a better idea about the platform...it was a little unclear from just reading their site and my past experience with the js lib, but after messing around and setting something up I think I have a better idea.
The CASH Music platform itself basically offers you a handful of tools to paywall asset files (that you've uploaded to google drive or Amazon S3). By paywall I mean things like "enter an email", "enter a download code", "pay some amount via stripe or paypal". It also has a sort-of WISYWIG editor for building a basic static site hosted at your-username.cashmusic.org. For an example, here's the page I created while testing this stuff out (disclaimer: please do not buy my in-progress recordings, feel free to download them to see how the service works if you'd like but they are not in a state to be consumed heh). Important note: there doesn't seem to be a "stream" widget you can add to the your-username.cashmusic.org site (at least one that's not custom coded...and it was a little unclear if it was cool to add custom code/cdn'd libs/etc. to the static site).
The CASHmusic.js lib is basically a bunch of helpful ui elements for building a custom artist or label site. It allows you to embed the elements from the CASH Music platform described in the above paragraph to any site. There's also several streaming players.
Basically, the open source stuff CASH Music is doing is really cool. Based on the use case described here (a site people could go to both stream & download releases), it seems like the tools could be used to build something custom for the lines netlabel. That being said, the tech hurdle seemed to be (definitely understandbly...see my previous comment on personal projects ) the main cause for the stagnation of the netlabel idea a few months back. Based on what I know about CASH Music now, I don't think the tools it provides are the ticket to overcome that particular hurdle.
IMO, using bandcamp (at least at first) seems like it would be an easy way to get the idea off the ground (and it would also provide a large network for people to find the releases which is definitely cool).