[Lightning-dev] AMP: Atomic Multi-Path Payments over Lightning

Rusty Russell rusty at rustcorp.com.au
Wed Feb 7 23:21:43 UTC 2018


Olaoluwa Osuntokun <laolu32 at gmail.com> writes:
> Hi Y'all,
>
> A common question I've seen concerning Lightning is: "I have five $2
> channels, is it possible for me to *atomically* send $6 to fulfill a
> payment?". The answer to this question is "yes", provided that the receiver

This is awesome!  I'm kicking myself for not proposing it :)

Unfortunately, your proposal defines a way to make multipath donations,
not multipath payments :(

In other words, you've lost proof of payment, which IMHO is critical.

Fortunately, this can be fairly trivially fixed when we go to scriptless
scripts or other equivalent decorrelation mechanism, when I think this
mechanism becomes extremely powerful.

>   - Potential fee savings for larger payments, contingent on there being a
>     super-linear component to routed fees. It's possible that with
>     modifications to the fee schedule, it's actually *cheaper* to send
>     payments over multiple flows rather than one giant flow.

This is a stretch.  I'd stick with the increased reliability/privacy
arguments which are overwhelmingly compelling IMHO.

If I have any important feedback on deeper reading (and after a sccond
coffee), I'll send a separate email.

Thanks!
Rusty.


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