Good morning Ignatius and Christian,
I was thinking of this also recently.
I was thinking it would be possible to create a "multifundchannel" command,
which accepts multiple node id and msatoshi pairs, which would create a
transaction with multiple channel outputs and negotiate with each node. A
difficulty would be ensuring that all target nodes are alive, as well as to
consider what to do if some of the target nodes are not contactable - do we
"fail hard" and not make any channels or do we "fail soft" and make channels
only with nodes that are alive and ignore dead nodes, but that can be added as
an option. Another difficulty would be to wait for all counterparties to
complete the protocol and sign the commitment transactions, before signing and
broadcasting the initial opening transaction. Doable, I suppose.
The same command can then be modified in the future to utilize
Decker-Burchert-Wattenhofer channel factories, where the channel factory (like
the current channels) are initially funded by a single party. In the same way
that we punted on the funding of channels and made them initially funded by a
single party, we could punt on channel factories and make them initially funded
by a single party, but add new protocol messages for channel factory operations
(although I cannot imagine how those would function as yet -- but then we
should really focus on making the network itself first).
Regards,
ZmnSCPxj
> -------- Original Message --------
> Subject: Re: [Lightning-dev] Is it possible to fund multiple channels using
> single transaction with multiple output?
> Local Time: December 25, 2017 7:41 PM
> UTC Time: December 25, 2017 11:41 AM
> From: decker.christ...@gmail.com
> To: Ignatius Rivaldi <minecraft2...@gmail.com>,
> lightning-dev@lists.linuxfoundation.org
>
> Hi Ignatius,
>
> welcome to the list :-)
>
>> I'm a noob in bitcoin and lightning network, and several days ago I
>> just knew a concept called transaction batching, which is to pay
>> multiple payments with single transaction and single transaction fee,
>> which is much cheaper then doing multiple payments with multiple
>> transactions and multiple transaction fee. Now, is it possible to use
>> this thing to create multiple lightning channels with single
>> transaction, reducing transaction fee?
>
> Absolutely, the protocol always refers to a channel by its short channel
> ID (blockheight, transaction pos, output pos). So a single transaction
> can fund multiple channels. I should however mention that this is
> currently not implemented in any of the wallets, but it shouldn't be too
> much of a problem to do so. The main problem is that in order to use
> this you need to coordinate the fund-channel process for all channels in
> parallel, so initially it's probably only going to be used to fund
> channels from a single initiator.
>
> Cheers,
> Christian
> ---------------------------------------------------------------
>
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