Demo video of the Cashu Channel in action.

It shows a few thousand payments and Bob's exit. And it explains how Bob can't double spend and shows how Alice gets her refund

https://youtu.be/0xyBRMSHxM4

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Links:

- the initial proposal: https://github.com/cashubtc/nuts/blob/8b94481c4d2320e6fdb05fb9180528430c10b827/XX.md

- this demo code: https://github.com/SatsAndSports/cdk/pull/1/files