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How is Tether connected to the Lightning Network? (The picture works on an artistic level, though.)

Tether is just a dark cloud over all of crypto. Also Blockstream is an investor in Tether.

I didn't know Blockstream owned part of Tether. The crypto space has its own parallels of the mess that the mainstream financial system is.

Might be the other way around with bitfinex invested in blockstream. I know they are tied together. Why tether just went live on liquid recently