public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: Alphonse Pace <alp.bitcoin@gmail.com>
Cc: bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Some real-world results about the current Segwit Discount
Date: Mon, 8 May 2017 18:47:32 -0500	[thread overview]
Message-ID: <CAMBsKS_j7Lso6fHoMPkrQ7UFwKfxOERAAqL=aUF83O4CqL+iFg@mail.gmail.com> (raw)
In-Reply-To: <CAKzdR-qojNn8OtUTPbxa0JauK9nmo2ZGm4ihKuyzsz_FAgokDw@mail.gmail.com>

[-- Attachment #1: Type: text/plain, Size: 1970 bytes --]

Sergio,

I'm not sure what the data you present has to do with the discount.  A 75%
discount prevents witness spam precisely because it is 75%, nothing more.
The current usage simply gives a guideline on how much capacity is gained
through a particular discount.  With the data you show, it would imply that
those blocks, with SegWit used where possible, would result in blocks of
~1.8MB.



On Mon, May 8, 2017 at 5:42 PM, Sergio Demian Lerner via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> I have processed 1000 blocks starting from Block #461653.
>
> I computed several metrics, including the supposed size of witness data
> and non-witness data (onchain), assuming all P2SH inputs/outputs are
> converted to P2PWSH and all P2PKH inputs/outputs are converted to P2WPKH.
>
> This takes into account that other types of transactions will not be
> modified by Segwit (e.g. OP_RETURN outputs, or P2PK). This analysis doesn't
> take into account that LN transactions may affect the current state,
>  increasing the segwit/nosegwit ratio.
>
> Among a lot of information, I've got the following real world results...
>
> acMainChainSpace =352608924
> acSegwitSpace =599400403
> Ratio segwit/nosegwit=1.6999
>
> This implies that the 75% that discount is not the best option to prevent
> witness spam in a block of 4 MB, as stated in https://segwit.org/why-a-
> discount-factor-of-4-why-not-2-or-8-bbcebe91721e.
>
> The non-witness data weight factor should not be 4 but 2.35. The closest
> integer value is 2, which leads to a 50% witness discount.
>
> The Bitcoinj source code is available for anyone to review. I encourage
> anyone to re-compute this with another utility to cross-check. Maybe
> Antoine Le Calvez (p2sh.info) would like to double-check.
>
>
>
>
>
>
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>
>

[-- Attachment #2: Type: text/html, Size: 2969 bytes --]

  reply	other threads:[~2017-05-08 23:47 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-08 22:42 [bitcoin-dev] Some real-world results about the current Segwit Discount Sergio Demian Lerner
2017-05-08 23:47 ` Alphonse Pace [this message]
2017-05-09 13:49   ` Sergio Demian Lerner
2017-05-09 14:33     ` James Hilliard
2017-05-09 15:45     ` Johnson Lau
2017-05-09 16:19       ` Sergio Demian Lerner
2017-05-09 16:27         ` Johnson Lau
2017-05-09 16:27         ` James Hilliard
2017-05-09 18:15     ` Matt Corallo
2017-05-09 18:58       ` Sergio Demian Lerner
2017-05-09 19:15         ` Sergio Demian Lerner
2017-05-09 19:30           ` Gregory Maxwell
2017-05-09 19:42             ` Matt Corallo
2017-05-09 20:13               ` Gregory Maxwell
2017-05-09 20:58                 ` Sergio Demian Lerner
2017-05-10  5:37                   ` Jorge Timón
2017-05-10 14:05                   ` Matt Corallo
2017-05-10 15:25                     ` Sergio Demian Lerner
2017-05-10 16:39                       ` Matt Corallo
2017-05-10 19:40                         ` Sergio Demian Lerner
2017-05-08 23:56 ` Gregory Maxwell

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAMBsKS_j7Lso6fHoMPkrQ7UFwKfxOERAAqL=aUF83O4CqL+iFg@mail.gmail.com' \
    --to=alp.bitcoin@gmail.com \
    --cc=bitcoin-dev@lists.linuxfoundation.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox