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Date: Fri, 05 Jan 2024 18:02:39 +0000
To: "David A. Harding" <dave@dtrt.org>
From: yurisvb@pm.me
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Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Lamport scheme (not signature) to economize on L1
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Dear friends and colleagues,

I believe this current version of the protocol and its documentation, now =
including a diagram answers the questions raised so far:

https://github.com/Yuri-SVB/LVBsig/blob/main/docs/white_paper.md

All in all, in addition to the plain transaction TXi, only 36 bytes are ne=
eded to authenticate it. The number falls to 16 in case of address (addres=
s chain) is reused, because change address coincides with Lamport-scheme p=
re-image.

YSVB.

Sent with Proton Mail secure email.

On Monday, January 1st, 2024 at 11:17 AM, yurisvb@pm.me <yurisvb@pm.me> wr=
ote:


> Hello, Dave,
> =


> I'm afraid I didn't understand your objection. It would be great to have=
 a direct, real-time conversation with you, if you have the availability. =
Be my guest to DM me for that.
> =


> Though this is to be confirmed, I suspect my proposed scheme can be impl=
emented with available, existing Bitcoin infrastructure. As far as my limi=
ted knowledge goes, the trickiest part would be to have miners agree that =
pre-image of hash of a transaction, in a subsequent block is acceptable au=
thentication. As for the commitment, it could be implemented as ordinary s=
mart contracts are, and its size doesn't matter because in the normal use =
case, it is not mined.
> =


> To be clear: The only component that is mined other than addresses and t=
he plaintext transactions would be one hash, between 16 and 20 bytes. From=
 the No-Free-Lunch Principle, the cost for it is that transaction takes a =
few blocks, instead of just one to be validated.
> =


> YSVB
> =


> Sent with Proton Mail secure email.
> =


> =


> On Sunday, December 31st, 2023 at 8:33 PM, David A. Harding dave@dtrt.or=
g wrote:
> =


> =


> =


> > Hi Yuri,
> > =


> > I think it's worth noting that for transactions with an equal number o=
f
> > P2TR keypath spends (inputs) and P2TR outputs, the amount of space use=
d
> > in a transaction by the serialization of the signature itself (16 vbyt=
es
> > per input) ranges from a bit over 14% of transaction size (1-input,
> > 1-output) to a bit less than 16% (10,000-in, 10,000-out; a ~1 MvB tx).
> > I infer that to mean that the absolute best a signature replacement
> > scheme can do is free up 16% of block space.
> > =


> > An extra 16% of block space is significant, but the advantage of that
> > savings needs to be compared to the challenge of creating a highly pee=
r
> > reviewed implementation of the new signature scheme and then convincin=
g
> > a very large number of Bitcoin users to accept it. A soft fork proposa=
l
> > that introduces new-to-Bitcoin cryptography (such as a different hash
> > function) will likely need to be studied for a prolonged period by man=
y
> > experts before Bitcoin users become confident enough in it to trust
> > their bitcoins to it. A hard fork proposal has the same challenges as =
a
> > soft fork, plus likely a large delay before it can go into effect, and
> > it also needs to be weighed against the much easier process it would b=
e
> > for experts and users to review a hard fork that increased block
> > capacity by 16% directly.
> > =


> > I haven't fully studied your proposal (as I understand you're working =
on
> > an improved version), but I wanted to put my gut feeling about it into
> > words to offer feedback (hopefully of the constructive kind): I think
> > the savings in block space might not be worth the cost in expert revie=
w
> > and user consensus building.
> > =


> > That said, I love innovative ideas about Bitcoin and this is one I wil=
l
> > remember. If you continue working on it, I very much look forward to
> > seeing what you come up with. If you don't continue working on it, I
> > believe you're likely to think of something else that will be just as
> > exciting, if not more so.
> > =


> > Thanks for innovating!,
> > =


> > -Dave
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