[Lightning-dev] Machine-to-machine LN payments

Eugene eupn at protonmail.com
Sun May 17 06:27:15 UTC 2020


Hello,

I found a way for one client to initiate a payment from the other by using spontaneous keysend payments:

1. Payee sends keysend payment of negligible amount (1 sat?)
2. Payer accepts keysend and verifies that it comes from a trusted node
3. Payer makes a keysend payment of required amount back to Payee
4. Payee accepts payment

Step two should probably be implemented by a custom plugin that checks incoming keysend messages and pays valid ones back.

The flow above is basically uses keysend to send an invoice to Payer to be paid. I wonder if there's an other way to send an invoice through LN by Payer's node public key?

Cheers,
Eugene

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, 15 May 2020 01:13, Eugene via Lightning-dev <lightning-dev at lists.linuxfoundation.org> wrote:

> Hello, list,
>
> I haven't closely following the Lightning Network's state of affairs since late 2018 and I wondering, is it possible to support the following use-case with LN:
>
> 1. A user subscribes to the service by opening a channel with it
> 2. User sets his LN node to "trust" invoices that come from said service
> 3. On subscription renewal, service sends an invoice to the client's LN node
> 4. Since the client's node is "trusting" service's node, it pays invoice straight away
>
> User, of course, may cancel the subscription at any time by removing service's LN node public key from the list of "trusted". Or the user can set a limit on the amount and the frequency of payments that would be accepted from the trusted node.
>
> For that matter, the questions are:
>
> 1. Is it possible to send invoices just by LN means? (Should we use TLVs?)
> 2. Is it possible to enable automatic machine-to-machine payments? As in the example above, by accepting invoices from "trusted" nodes.
>
> Best regards,
> Eugene
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