Are you sure about Sopcast continuing to run even if the proxy goes down? I have tested it with a VPN, and find that Sopcast will go down if your VPN goes down. I have been testing various ways to hide your IP in the event of the bill criminalising stremaing passing, and I found that when broadcasting with Sopcast, that my stream will go down, if I disconnect from the VPN. I was testing to see which goes down when the VPN goes down, so that the broadcaster does not have the FBI knocking at thier door. And Sopcast is the only one that passes this test.
So from my experiments, Sopcast will go down if the VPN goes down.