Good morning Stepan,
> # Offline invoice generation
>
> Some time ago there was a discussion about offline vending machines, the idea
> was to pre-load a vending machine with invoices, display invoices to the user
> and ask for the preimage as a payment confirmation. When all invoices are
> use
Hi ZmnSCPxj,
> Just to be clear: each time the vending node needs a new invoice, it
generates a new ephemeral key `k`?
Yes, the vending machine generates a new `k` for every invoice.
The same technique can be used for spontaneous payments as well and in this
case we can also provide additional i
