>
> Will it actually add any more fragmentation that already exists? Due to all
> the extensibility we've added in the protocol, it's already possible for
> any
> implementation to start to work on their own sub-protocols. This just gives
> them a new venue to at least _describe_ what they're using.
>

It's only my 2 cents, but I'm afraid it will indeed add more fragmentation,
because
the fact that there exists a bLIP for feature XXX will likely act as a
green light to
deploy it faster instead of spending more time talking about it with the
community
and thinking about potential issues, forward-compatibility, etc.

But I agree with you that it also gives more freedom to experiment in the
real world,
which helps find issues and correct them, paving the way for better
features for
end users.

It's also likely the case that already implementations, or typically forks
> of implementations are already using "undocumented" TLVs or feature bits in
> the wild today.
>

But today we're usually very careful when we do that, and use numbers in
high ranges
for these use-cases. In our case for example we use message type 35007 for
our
swap-in and we expect that to change once standardized, so we did extra
work to
ensure we wouldn't paint ourselves into a corner when switching to a
standard version.

I think that if we have a centralized bLIP repo, we can take this
opportunity to safely
assign "final" values for types and feature bits that are used by each
bLIP, and stronger
guarantees that they will not conflict with another bLIP or BOLT. Of course
that doesn't
stop anyone from deploying a conflict, but their use of the same bits won't
be documented
so it shouldn't be widely deployed, and browsing the BOLTs and bLIPs should
let anyone
see what the "correct" meaning of those bits should be.

Cheers,
Bastien


Le jeu. 1 juil. 2021 à 22:43, Olaoluwa Osuntokun <laol...@gmail.com> a
écrit :

> > But they don't address the first point at all, they instead work around
> > it.  To be fair, I don't think we can completely address that first
> point:
> > properly reviewing spec proposals takes a lot of effort and accepting
> > complex changes to the BOLTs shouldn't be done lightly.
>
> I think this is a fair characterization that I agree with. I also agree
> that
> there isn't really a way to fundamentally address it. The issue of scarce
> review resources is something just about any large open source project
> needs
> to deal with: everyone wants to make a PR, but no one wants to review the
> PRs of others, unless it scratches some tangential itch they may have. IMO
> it's also the case that the problem/solution space of LN is so large, that
> it's hard to expect every developer to review each new proposal that comes
> in, as they themselves have their own set of priorities (product,
> businesses, protocol, personal, etc).
>
> In the end though, I think when there've been critical items that affect
> all
> implementations and/or the existence of the protocol itself, developers
> typically band together to commit resources to help a proposal move
> forward.
> One upcoming example of this will be the "base" taproot channel type (the
> design space is pretty large in that it even permits a new type of
> symmetric
> state revocation-based channel).
>
> >  it will add fragmentation to the network, it will add maintenance costs
> >  and backwards-compatibility issues
>
> Will it actually add any more fragmentation that already exists? Due to all
> the extensibility we've added in the protocol, it's already possible for
> any
> implementation to start to work on their own sub-protocols. This just gives
> them a new venue to at least _describe_ what they're using. As usual, it's
> up to other implementations if they want to adopt it or not, or advise
> against its use.
>
> >  many bLIPs will be sub-optimal solutions to the problem they try to
> solve
> >  and some bLIPs will be simply insecure and may put users' funds at risk
> >  (L2 protocols are hard and have subtle issues that can be easily missed)
>
> This may be the case, but I guess at times it's hard to know if something
> is
> objectively sub-optimal without further exploration of the design space,
> which usually means either more people involved, or more time examining the
> problem. Ultimately, different wallets/implementations may also be willing
> to make different usability/security trade-offs. One example here is zero
> conf channels: they assume a greater degree of trust with the party you're
> _accepting_ the channel from, as if you receive funds over the channel,
> they
> can be double spent away. However it's undeniable that they improve the UX
> by reducing the amount of time a user needs to wait around before they can
> actually jump in and use LN.
>
> In the end though, there's no grand global committee that prevents people
> from deploying software they think is interesting or useful. In the long
> run, I guess one simply needs to hope that bad ideas die out, or speak out
> against them to the public. As LN sits a layer above the base protocol,
> widespread global consensus isn't really required to make certain classes
> of
> changes, and you can't stop people from experimenting on their own.
>
> > We can't have collisions on any of these three things.
>
> Yeah, collisions are def possible. IMO, this is where the interplay with
> BOLTs comes in: BOLTs are the global feature bit/tlv/message namespace.  A
> bLIP might come with the amendment of BOLT 9 to define feature bits they
> used. Of course, this should be done on a best effort basis, as even if you
> assign a bit for your idea, someone can just go ahead and deploy something
> else w/ that same bit, and they may never really intersect depending on the
> nature or how widespread the new feature is.
>
> It's also likely the case that already implementations, or typically forks
> of implementations are already using "undocumented" TLVs or feature bits in
> the wild today. I don't know exactly which TLV type things like
> applications
> that tunnel messages over the network use, but afaik so far there haven't
> been any disastrous collisions in the wild.
>
> -- Laolu
>
> On Thu, Jul 1, 2021 at 2:19 AM Bastien TEINTURIER <bast...@acinq.fr>
> wrote:
>
>> Thanks for starting that discussion.
>>
>> In my opinion, what we're really trying to address here are the two
>> following
>> points (at least from the point of view of someone who works on the spec
>> and
>> an implementation):
>>
>> - Implementers get frustrated when they've worked on something that they
>> think
>> is useful and they can't get it into the BOLTs (the spec PR isn't
>> reviewed,
>> it progresses too slowly or there isn't enough agreement to merge it)
>> - Implementers expect other implementers to specify the optional features
>> they
>> ship: we don't want to have to reverse-engineer a sub-protocol when users
>> want our implementation to provide support for feature XXX
>>
>> Note that these are two very different concerns.
>>
>> bLIPs/SPARKS/BIPs clearly address the second point, which is good.
>> But they don't address the first point at all, they instead work around
>> it.
>> To be fair, I don't think we can completely address that first point:
>> properly
>> reviewing spec proposals takes a lot of effort and accepting complex
>> changes
>> to the BOLTs shouldn't be done lightly.
>>
>> I am mostly in favor of this solution, but I want to highlight that it
>> isn't
>> only rainbows and unicorns: it will add fragmentation to the network, it
>> will
>> add maintenance costs and backwards-compatibility issues, many bLIPs will
>> be
>> sub-optimal solutions to the problem they try to solve and some bLIPs
>> will be
>> simply insecure and may put users' funds at risk (L2 protocols are hard
>> and have
>> subtle issues that can be easily missed). On the other hand, it allows
>> for real
>> world experimentation and iteration, and it's easier to amend a bLIP than
>> the
>> BOLTs.
>>
>> On the nuts-and-bolts (see the pun?) side, bLIPs cannot embrace a fully
>> bazaar
>> style of evolution. Most of them will need:
>>
>> - to assign feature bit(s)
>> - to insert new tlv fields in existing messages
>> - to create new messages
>>
>> We can't have collisions on any of these three things. bLIP XXX cannot
>> use the
>> same tlv types as bLIP YYY otherwise we're creating network
>> incompatibilities.
>> So they really need to be centralized, and we need a process to assign
>> these
>> and ensure they don't collide. It's not a hard problem, but we need to be
>> clear
>> about the process around those.
>>
>> Regarding the details of where they live, I don't have a strong opinion,
>> but I
>> think they must be easy to find and browse, and I think it's easier for
>> readers
>> if they're inside the spec repository. We already have PRs that use a
>> dedicated
>> "proposals" folder (e.g. [1], [2]).
>>
>> Cheers,
>> Bastien
>>
>> [1] https://github.com/lightningnetwork/lightning-rfc/pull/829
>> [2] https://github.com/lightningnetwork/lightning-rfc/pull/854
>>
>> Le jeu. 1 juil. 2021 à 02:31, Ariel Luaces <ariellua...@gmail.com> a
>> écrit :
>>
>>> BIPs are already the Bazaar style of evolution that simultaneously
>>> allows flexibility and coordination/interoperability (since anyone can
>>> create a BIP and they create an environment of discussion).
>>>
>>> BOLTs are essentially one big BIP in the sense that they started as a
>>> place for discussion but are now more rigid. BOLTs must be followed
>>> strictly to ensure a node is interoperable with the network. And BOLTs
>>> should be rigid, as rigid as any widely used BIP like 32 for example.
>>> Even though BOLTs were flexible when being drafted their purpose has
>>> changed from descriptive to prescriptive.
>>> Any alternatives, or optional features should be extracted out of
>>> BOLTs, written as BIPs. The BIP should then reference the BOLT and the
>>> required flags set, messages sent, or alterations made to signal that
>>> the BIP's feature is enabled.
>>>
>>> A BOLT may at some point organically change to reference a BIP. For
>>> example if a BIP was drafted as an optional feature but then becomes
>>> more widespread and then turns out to be crucial for the proper
>>> operation of the network then a BOLT can be changed to just reference
>>> the BIP as mandatory. There isn't anything wrong with this.
>>>
>>> All of the above would work exactly the same if there was a bLIP
>>> repository instead. I don't see the value in having both bLIPs and
>>> BIPs since AFAICT they seem to be functionally equivalent and BIPs are
>>> not restricted to exclude lightning, and never have been.
>>>
>>> I believe the reason this move to BIPs hasn't happened organically is
>>> because many still perceive the BOLTs available for editing, so
>>> changes continue to be made. If instead BOLTs were perceived as more
>>> "consensus critical", not subject to change, and more people were
>>> strongly encouraged to write specs for new lightning features
>>> elsewhere (like the BIP repo) then you would see this issue of growing
>>> BOLTs resolved.
>>>
>>> Cheers
>>> Ariel Lorenzo-Luaces
>>>
>>> On Wed, Jun 30, 2021 at 1:16 PM Olaoluwa Osuntokun <laol...@gmail.com>
>>> wrote:
>>> >
>>> > > That being said I think all the points that are addressed in Ryan's
>>> mail
>>> > > could very well be formalized into BOLTs but maybe we just need to
>>> rethink
>>> > > the current process of the BOLTs to make it more accessible for new
>>> ideas
>>> > > to find their way into the BOLTs?
>>> >
>>> > I think part of what bLIPs are trying to solve here is promoting more
>>> loosely
>>> > coupled evolution of the network. I think the BOLTs do a good job
>>> currently of
>>> > specifying what _base_ functionality is required for a routing node in
>>> a
>>> > prescriptive manner (you must forward an HTLC like this, etc). However
>>> there's
>>> > a rather large gap in describing functionality that has emerged over
>>> time due
>>> > to progressive evolution, and aren't absolutely necessary, but enhance
>>> > node/wallet operation.
>>> >
>>> > Examples of  include things like: path finding heuristics (BOLTs just
>>> say you
>>> > should get from Alice to Bob, but provides no recommendations w.r.t
>>> _how_ to do
>>> > so), fee bumping heuristics, breach retribution handling, channel
>>> management,
>>> > rebalancing, custom records usage (like the podcast index meta-data,
>>> messaging,
>>> > etc), JIT channel opening, hosted channels, randomized channel IDs, fee
>>> > optimization, initial channel boostrapping, etc.
>>> >
>>> > All these examples are effectively optional as they aren't required
>>> for base
>>> > node operation, but they've organically evolved over time as node
>>> > implementations and wallet seek to solve UX and operational problems
>>> for
>>> > their users. bLIPs can be a _descriptive_ (this is how things can be
>>> done)
>>> > home for these types of standards, while BOLTs can be reserved for
>>> > _prescriptive_ measures (an HTLC looks like this, etc).
>>> >
>>> > The protocol as implemented today has a number of extensions (TLVs,
>>> message
>>> > types, feature bits, etc) that allow implementations to spin out their
>>> own
>>> > sub-protocols, many of which won't be considered absolutely necessary
>>> for node
>>> > operation. IMO we should embrace more of a "bazaar" style of
>>> evolution, and
>>> > acknowledge that loosely coupled evolution allows participants to more
>>> broadly
>>> > explore the design space, without the constraints of "it isn't a thing
>>> until N
>>> > of us start to do it".
>>> >
>>> > Historically, BOLTs have also had a rather monolithic structure. We've
>>> used
>>> > the same 11 or so documents for the past few years with the size of the
>>> > documents swelling over time with new exceptions, features,
>>> requirements,
>>> > etc. If you were hired to work on a new codebase and saw that
>>> everything is
>>> > defined in 11 "functions" that have been growing linearly over time,
>>> you'd
>>> > probably declare the codebase as being unmaintainable. By having
>>> distinct
>>> > documents for proposals/standards, bLIPs (author documents really),
>>> each new
>>> > standard/proposal is able to be more effectively explained, motivated,
>>> versionsed,
>>> > etc.
>>> >
>>> > -- Laolu
>>> >
>>> >
>>> > On Wed, Jun 30, 2021 at 7:35 AM René Pickhardt via Lightning-dev <
>>> lightning-dev@lists.linuxfoundation.org> wrote:
>>> >>
>>> >> Hey everyone,
>>> >>
>>> >> just for reference when I was new here (and did not understand the
>>> processes well enough) I proposed a similar idea (called LIP) in 2018 c.f.:
>>> https://lists.linuxfoundation.org/pipermail/lightning-dev/2018-July/001367.html
>>> >>
>>> >> I wonder what exactly has changed in the reasoning by roasbeef which
>>> I will repeat here:
>>> >>
>>> >> > We already have the equiv of improvement proposals: BOLTs.
>>> Historically
>>> >>
>>> >> > new standardization documents are proposed initially as issues or
>>> PR's when
>>> >>
>>> >> > ultimately accepted. Why do we need another repo?
>>> >>
>>> >>
>>> >> As far as I can tell there was always some form of (invisible?)
>>> barrier to participate in the BOLTs but there are also new BOLTs being
>>> offered:
>>> >> * BOLT 12: https://github.com/lightningnetwork/lightning-rfc/pull/798
>>> >> * BOLT 14: https://github.com/lightningnetwork/lightning-rfc/pull/780
>>> >> and topics to be included like:
>>> >> * dual funding
>>> >> * splicing
>>> >> * the examples given by Ryan
>>> >>
>>> >> I don't see how a new repo would reduce that barrier - Actually I
>>> think it would even create more confusion as I for example would not know
>>> where something belongs. That being said I think all the points that are
>>> addressed in Ryan's mail could very well be formalized into BOLTs but maybe
>>> we just need to rethink the current process of the BOLTs to make it more
>>> accessible for new ideas to find their way into the BOLTs? One thing that I
>>> can say from answering lightning-network questions on stackexchange is that
>>> it would certainly help if the BOLTs where referenced  on lightning.network
>>> web page and in the whitepaper as the place to be if one wants to learn
>>> about the Lightning Network
>>> >>
>>> >> with kind regards Rene
>>> >>
>>> >> On Wed, Jun 30, 2021 at 4:10 PM Ryan Gentry via Lightning-dev <
>>> lightning-dev@lists.linuxfoundation.org> wrote:
>>> >>>
>>> >>> Hi all,
>>> >>>
>>> >>>
>>> >>> The recent thread around zero-conf channels [1] provides an
>>> opportunity to discuss how the BOLT process handles features and best
>>> practices that arise in the wild vs. originating within the process itself.
>>> Zero-conf channels are one of many LN innovations on the app layer that
>>> have struggled to make their way into the spec. John Carvalho and Bitrefill
>>> launched Turbo channels in April 2019 [2], Breez posted their solution to
>>> the mailing list for feedback in August 2020 [3], and we know at least
>>> ACINQ and Muun (amongst others) have their own implementations. In an ideal
>>> world there would be a descriptive design document that the app layer
>>> implementers had collaborated on over the years that the spec group could
>>> then pick up and merge into the BOLTs now that the feature is deemed
>>> spec-worthy.
>>> >>>
>>> >>>
>>> >>> Over the last couple of months, we have discussed the idea of adding
>>> a BIP-style process (bLIPs? SPARKs? [4]) on top of the BOLTs with various
>>> members of the community, and have received positive feedback from both app
>>> layer and protocol devs. This would not affect the existing BOLT process at
>>> all, but simply add a place for app layer best practices to be succinctly
>>> described and organized, especially those that require coordination. These
>>> features are being built outside of the BOLT process today anyways, so
>>> ideally a bLIP process would bring them into the fold instead of leaving
>>> them buried in old ML posts or not documented at all.
>>> >>>
>>> >>>
>>> >>> Some potential bLIP ideas that people have mentioned include: each
>>> lnurl variant, on-the-fly channel opens, AMP, dynamic commitments, podcast
>>> payment metadata, p2p messaging formats, new pathfinding heuristics, remote
>>> node connection standards, etc.
>>> >>>
>>> >>>
>>> >>> If the community is interested in moving forward, we've started a
>>> branch [5] describing such a process. It's based on BIP-0002, so not trying
>>> to reinvent any wheels. It would be great to have developers from various
>>> implementations and from the broader app layer ecosystem volunteer to be
>>> listed as editors (basically the same role as in the BIPs).
>>> >>>
>>> >>>
>>> >>> Looking forward to hearing your thoughts!
>>> >>>
>>> >>>
>>> >>> Best,
>>> >>> Ryan
>>> >>>
>>> >>>
>>> >>> [1]
>>> https://lists.linuxfoundation.org/pipermail/lightning-dev/2021-June/003074.html
>>> >>>
>>> >>> [2]
>>> https://www.coindesk.com/bitrefills-thor-turbo-lets-you-get-started-with-bitcoins-lightning-faster
>>> >>>
>>> >>> [3]
>>> https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-August/002780.html
>>> >>>
>>> >>> [4] bLIP = Bitcoin Lightning Improvement Proposal and SPARK =
>>> Standardization of Protocols at the Request of the Kommunity (h/t fiatjaf)
>>> >>>
>>> >>> [5]
>>> https://github.com/ryanthegentry/lightning-rfc/blob/blip-0001/blips/blip-0001.mediawiki
>>> >>>
>>> >>> _______________________________________________
>>> >>> Lightning-dev mailing list
>>> >>> Lightning-dev@lists.linuxfoundation.org
>>> >>> https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev
>>> >>
>>> >>
>>> >>
>>> >> --
>>> >> https://www.rene-pickhardt.de
>>> >> _______________________________________________
>>> >> Lightning-dev mailing list
>>> >> Lightning-dev@lists.linuxfoundation.org
>>> >> https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev
>>> >
>>> > _______________________________________________
>>> > Lightning-dev mailing list
>>> > Lightning-dev@lists.linuxfoundation.org
>>> > https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev
>>> _______________________________________________
>>> Lightning-dev mailing list
>>> Lightning-dev@lists.linuxfoundation.org
>>> https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev
>>>
>> _______________________________________________
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>> Lightning-dev@lists.linuxfoundation.org
>> https://lists.linuxfoundation.org/mailman/listinfo/lightning-dev
>>
>
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