This is the [Zap wallet](https://github.com/LN-Zap/zap-android). It connects over Tor to my R[aspiblitz](https://github.com/rootzoll/raspiblitz) at home, which is basically my own little bank . To pay you scan a QR code on the display of the beer tap. The payment process over the Bitcoin Lightning Network is settled within seconds and then you get the beer.
There is no third party service of any kind involved. The payment gets routed directly from my Raspiblitz, which has a Bitcoin Core full node and a LND node, to the node of the beer tap. This is complete decentralization and complete sovereignty.
The whole thing was just as a demonstration, you could also get the beer for free at another booth
The bigger payment was purchasing a book from some guy there p2p
View Reddit by Ima_Wreckyou – View Source