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How is the signature

[transported to the server][1]

? Surely not through the lightning channels as I could authenticate with my 0 balance, freshly created

[Mutiny][2]

wallet. On the other hand, I could not authenticate
with my Core Lightning node when I gave lnURL string as an argument to lightning-cli pay despite having two channels and a large gossip file. What command should I use, if any, in order to authenticate with Core Lightning?

[1]: https://stacker.news/items/98600

[2]: https://app.mutinywallet.com/