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Re: urn-5 vs hashes (was: Re: [Gzz] RE: [ba-ohs-talk] Fenfire,RDF (re "Towards a Standard Graph-Based..."))

on 2003/03/08 11:20 AM, Benja Fallenstein at b.fallenstein@gmx.de wrote:    (01)

> Hi Toni--
> Alatalo Toni wrote:
>> On Sat, 8 Mar 2003, Danny Ayers wrote:
>>> Hmm, I'm sure you have good reason to use something other than URIs for
> (replied to Danny by private mail)
>> afaik the cryptographic content hash forms the URI (urn-5)
> Nope, urn:urn-5 is for random numbers (when you create a new node and
> want to assign a random URI to it) and is not related to hashes. There's
> no URI scheme or URN namespace for hashed data, yet (AFAIK).
> (Sorry to send this thru the lists, but it would be bad if this
> misconception stood without refutation...)
> - Benja    (02)

Actually, there's at least three used with the various file sharing apps:    (03)

MAGNET, apparently supported by some Gnutella programs. Uses sha1. Example:
<magnet:?xt=urn:sha1:ZETNTXVNDO2DS32627BQNKIADS3RT3T5&dn=Shareaza1700.exe>    (04)

eDonkey ed2k URIs, which use MD4. Example:
<ed2k://|file|Shareaza1700.exe|1330539|b29e2440d84ed468a63971220667786f|/>    (05)

sig2dat URIs, used with Kazaa, Grokster, etc. Not sure what hash. Example:
Kevin Keck
keck@kecklabs.com    (06)