Something to throw in here too, to my knowledge, your hub has to be connecting to some 3rd party chain state validation servers (bitcoin nodes) to see the blockchain, it's not validating transactions locally. (it does not do an initial block download) Which means DNS poison or possibly malicious nodes (whatever method they use to connect to nodes). I believe they support connecting to LND which would allow you to bypass this, which I'd highly recommend. But if you're running LND and Bitcoin Core in a full node already, what are they offering? A GUI?