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From: Erik Aronesty <erik@q32.com>
Date: Mon, 8 May 2017 14:58:54 -0400
Message-ID: <CAJowKgJPZ=sQFXW631Czr7zYTX-ghg5ousjjkedJo-fXsefHvQ@mail.gmail.com>
To: Karl Johan Alm <karljohan-alm@garage.co.jp>
Content-Type: multipart/alternative; boundary=001a113e49b8a5a3e3054f07d4a1
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] BIP Proposal: Rate Limiting with server specified
 Proof of Work challenges
Precedence: list

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- It would be cool if any rate-limiting POW was specified as bytecode ...
so nodes can plug in as many "machine-captcha" things as they please, and
solvers can choose to solve... or just say "nope too hard".

- Alternately, it would be a lot nicer if you just required people to pay a
nanobit .... that could prevent DDOS even better, and generate a revenue
stream for nodes.


On Sun, May 7, 2017 at 10:48 PM, Karl Johan Alm via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Hello,
>
> I am proposing a new feature for rate limiting purposes where nodes
> can make and solve arbitrary PoW challenges in return for connection
> slots (to be expanded to cover e.g. bloom filters or other DoS risky
> services).
>
> The BIP currently includes two proofs of work (sha256 and
> cuckoo-cycle) which can be combined (e.g. sha256(cuckoo-cycle) or
> sha256(sha256(sha256)), etc).
>
> Link: https://github.com/kallewoof/bips/blob/pow-connection-
> slots/bip-rate-limiting-via-pow.mediawiki
>
> Feedback welcome.
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>

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<div dir=3D"ltr"><div>- It would be cool if any rate-limiting POW was speci=
fied as bytecode ... so nodes can plug in as many &quot;machine-captcha&quo=
t; things as they please, and solvers can choose to solve... or just say &q=
uot;nope too hard&quot;.<br><br></div>- Alternately, it would be a lot nice=
r if you just required people to pay a nanobit .... that could prevent DDOS=
 even better, and generate a revenue stream for nodes.<br><div><br></div></=
div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun, May 7=
, 2017 at 10:48 PM, Karl Johan Alm via bitcoin-dev <span dir=3D"ltr">&lt;<a=
 href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_blank">bi=
tcoin-dev@lists.linuxfoundation.org</a>&gt;</span> wrote:<br><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p=
adding-left:1ex">Hello,<br>
<br>
I am proposing a new feature for rate limiting purposes where nodes<br>
can make and solve arbitrary PoW challenges in return for connection<br>
slots (to be expanded to cover e.g. bloom filters or other DoS risky<br>
services).<br>
<br>
The BIP currently includes two proofs of work (sha256 and<br>
cuckoo-cycle) which can be combined (e.g. sha256(cuckoo-cycle) or<br>
sha256(sha256(sha256)), etc).<br>
<br>
Link: <a href=3D"https://github.com/kallewoof/bips/blob/pow-connection-slot=
s/bip-rate-limiting-via-pow.mediawiki" rel=3D"noreferrer" target=3D"_blank"=
>https://github.com/kallewoof/<wbr>bips/blob/pow-connection-<wbr>slots/bip-=
rate-limiting-via-<wbr>pow.mediawiki</a><br>
<br>
Feedback welcome.<br>
______________________________<wbr>_________________<br>
bitcoin-dev mailing list<br>
<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org">bitcoin-dev@lists.=
<wbr>linuxfoundation.org</a><br>
<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =
rel=3D"noreferrer" target=3D"_blank">https://lists.linuxfoundation.<wbr>org=
/mailman/listinfo/bitcoin-<wbr>dev</a><br>
</blockquote></div><br></div>

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