The authority part in a URI is optional.

blockchain:/tx/ca26cedeb9cbc94e030891578e0d2b688a28902114f6ad2f24ecd3918f76c17f

Notice the lack of a double-slash.

On Tuesday, 1 September 2015, at 11:38 pm, Marco Pontello wrote:
> I see your point. But I personally like that the chain part could be
> optional, given that the vast majority of the references in the end will be
> to Bitcoin main net.
>
> On Tue, Sep 1, 2015 at 11:16 PM, Matt Whitlock <bip@mattwhitlock.name>
> wrote:
>
> > Isn't this all backward? The "authority" component of the URL should
> > identify the chain, and the "path" component should identify the particular
> > block, tx, or address in that chain.
> >
> > So instead of:
> >
> >
> > blockchain://tx/ca26cedeb9cbc94e030891578e0d2b688a28902114f6ad2f24ecd3918f76c17f?chain=000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
> >
> > It should be:
> >
> >
> > blockchain://000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f/tx/ca26cedeb9cbc94e030891578e0d2b688a28902114f6ad2f24ecd3918f76c17f
> >
> > And I would agree with allowing well-known chains to register a name, to
> > be used as an alternative to the literal, hash syntax:
> >
> >
> > blockchain://bitcoin/tx/ca26cedeb9cbc94e030891578e0d2b688a28902114f6ad2f24ecd3918f76c17f
> >
> >
> > On Tuesday, 1 September 2015, at 4:49 pm, Marco Pontello wrote:
> > > On Sat, Aug 29, 2015 at 10:10 PM, Jorge Timón <
> > > bitcoin-dev@lists.linuxfoundation.org> wrote:
> > >
> > > >
> > > > I would really prefer chain=<chainID> over network=<chainPetnameStr>
> > > > By chainID I mean the hash of the genesis block, see
> > > >
> > > >
> > https://github.com/jtimon/bitcoin/commit/3191d5e8e75687a27cf466b7a4c70bdc04809d39
> > > > I'm completely fine with doing that using an optional parameter (for
> > > > backwards compatibility).
> > > >
> > >
> > > I see that using the genesis block hash would be the perfectly rigorous
> > way
> > > to do it, but what do you think about the possibility of letting also use
> > > the name constants, as a simple / more relaxed alternative? That would
> > > spare a source lookup just to write a correct reference to a tx, maybe
> > in a
> > > forum or a post.
> > >
> > > So a reference to a certain tx could be either:
> > >
> > >
> > blockchain://tx/ca26cedeb9cbc94e030891578e0d2b688a28902114f6ad2f24ecd3918f76c17f
> > >
> > >
> > blockchain://tx/ca26cedeb9cbc94e030891578e0d2b688a28902114f6ad2f24ecd3918f76c17f?chain=000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
> > >
> > >
> > blockchain://ca26cedeb9cbc94e030891578e0d2b688a28902114f6ad2f24ecd3918f76c17f?chain=main
> > >
> > > (or a different element name maybe)
> > >
> > > --
> > > Try the Online TrID File Identifier
> > > http://mark0.net/onlinetrid.aspx
> >
>
>
>
> --
> Try the Online TrID File Identifier
> http://mark0.net/onlinetrid.aspx