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Date: Fri, 30 Jan 2015 20:58:51 -0600
Message-ID: <CAJfRnm5H7gn6xmMFdikNFSy-geWrpW4dQDw8NsFqz_3YxH=ESg@mail.gmail.com>
From: Allen Piscitello <allen.piscitello@gmail.com>
To: Angel Leon <gubatron@gmail.com>
Content-Type: multipart/alternative; boundary=001a1134cd60aab83d050de9e6f4
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Is there a way to estimate the maximum
 number of transactions per minute Bitcoin can handle as it is today?
Precedence: list

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You are assuming that the only way to use Bitcoin is on-chain transactions
and that is the only way for it to scale.  This is a mistake.

On Fri, Jan 30, 2015 at 6:48 PM, Angel Leon <gubatron@gmail.com> wrote:

> On the Chinese "Single's Day" (sort of like the american Black Friday)
> according to MIT's Tech Review
> <http://www.technologyreview.com/news/534001/alipay-leads-a-digital-finance-revolution-in-china/>
> magazine
>
> "Alipay handled up to 2.85 million transactions per minute, and 54 percent
> of its transactions are made via mobile device."
>
> For a few weeks I've been reading the conversations about block sizes and
> the experiments being done on the subject with larger blocks.
>
> On the day with the most transactions, the Bitcoin block chain averages
> about 73 transactions per minute. I kept wondering what blocksize we'd need
> for handling 100,000 transactions per minute, and estimated that roughly
> we'd need a blocksize of about 1300x times larger than what we have now, so
> bigger than 1Gb block... but seeing the numbers Alipay gets to handle just
> in China make me wonder how scalable is Bitcoin if it were to truly compete
> with worldwide financial services.
>
> If you were to include double the number Alipay can handle, you'd be
> shooting about 6 million transactions per minute, or roughly 60 million
> transactions per block.
>
> If you average every transaction around 250 bytes, then you'd need ~15
> Gigabytes per block to be broadcast and hashed by all the full nodes every
> 10 minutes, eating good 2Tb of storage daily... do miners have enough
> bandwidth and CPU power to handle this?
>
> are my scalability concerns absurd?
>
> http://twitter.com/gubatron
>
>
> ------------------------------------------------------------------------------
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> your
> hub for all things parallel software development, from weekly thought
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">You are assuming that the only way to use Bitcoin is on-ch=
ain transactions and that is the only way for it to scale.=C2=A0 This is a =
mistake.</div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On =
Fri, Jan 30, 2015 at 6:48 PM, Angel Leon <span dir=3D"ltr">&lt;<a href=3D"m=
ailto:gubatron@gmail.com" target=3D"_blank">gubatron@gmail.com</a>&gt;</spa=
n> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;b=
order-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>On the Ch=
inese &quot;Single&#39;s Day&quot; (sort of like the american Black Friday)=
 according to <a href=3D"http://www.technologyreview.com/news/534001/alipay=
-leads-a-digital-finance-revolution-in-china/" target=3D"_blank">MIT&#39;s =
Tech Review</a> magazine</div><div><br></div><div><span style=3D"color:rgb(=
0,0,0);font-family:NHG,&#39;Helvetica Neue&#39;,Helvetica,Arial,sans-serif;=
font-size:14px;line-height:20px">&quot;Alipay handled up to 2.85 million tr=
ansactions per minute, and 54 percent of its transactions are made via mobi=
le device.&quot;</span><br></div><br>For a few weeks I&#39;ve been reading =
the conversations about block sizes and the experiments being done on the s=
ubject with larger blocks.<br><br>On the day with the most transactions, th=
e Bitcoin block chain averages about 73 transactions per minute. I kept won=
dering what blocksize we&#39;d need for handling 100,000 transactions per m=
inute, and estimated that roughly we&#39;d need a blocksize of about 1300x =
times larger than what we have now, so bigger than 1Gb block... but seeing =
the numbers Alipay gets to handle just in China make me wonder how scalable=
 is Bitcoin if it were to truly compete with worldwide financial services.<=
br><br>If you were to include double the number Alipay can handle, you&#39;=
d be shooting about 6 million transactions per minute, or roughly 60 millio=
n transactions per block.<br><br>If you average every transaction around 25=
0 bytes, then you&#39;d need ~15 Gigabytes per block to be broadcast and ha=
shed by all the full nodes every 10 minutes, eating good 2Tb of storage dai=
ly... do miners have enough bandwidth and CPU power to handle this?=C2=A0<b=
r><br>are my scalability concerns absurd?<br><br clear=3D"all"><div><div><a=
 href=3D"http://twitter.com/gubatron" target=3D"_blank">http://twitter.com/=
gubatron</a><br></div></div>
</div>
<br>-----------------------------------------------------------------------=
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Dive into the World of Parallel Programming. The Go Parallel Website,<br>
sponsored by Intel and developed in partnership with Slashdot Media, is you=
r<br>
hub for all things parallel software development, from weekly thought<br>
leadership blogs to news, videos, case studies, tutorials and more. Take a<=
br>
look and join the conversation now. <a href=3D"http://goparallel.sourceforg=
e.net/" target=3D"_blank">http://goparallel.sourceforge.net/</a><br>_______=
________________________________________<br>
Bitcoin-development mailing list<br>
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pment@lists.sourceforge.net</a><br>
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" target=3D"_blank">https://lists.sourceforge.net/lists/listinfo/bitcoin-de=
velopment</a><br>
<br></blockquote></div><br></div>

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