After a very long downtime, I restarted the composer I had running on testnet. You can connect the same way as previously, to two public nodes (with static IPv4s) that I’m running: --peers 51.158.203.7:19798 and --peers 51.15.139.238:19798.
There’s also an explorer for testnet: http://51.158.203.7/
Expect to see new blocks arriving in a regular interval there.
Transaction initiation is, as always, more reliable if you’re running a SingleProof capable machine but you might get lucky and have one of my machines upgrade your ProofCollection for you.