[Bitcoin-development] UUID to identify chains (payment protocol and elsewhere)

Mike Hearn mike at plan99.net
Tue May 21 03:30:00 UTC 2013

Bitcoinj already has such chain id's and we use standard Java style reverse
DNS names: org.bitcoin.main, etc. If we want a more global naming system
that seems like a good compromise between uniqueness and readability.
On 20 May 2013 19:45, "Jeff Garzik" <jgarzik at exmulti.com> wrote:

> On Mon, May 20, 2013 at 7:59 PM, Mark Friedenbach <mark at monetize.io>
> wrote:
> > So as to remain reasonably compliant with RFC 4122, I recommend that we
> > use Version 4 (random) UUIDs, with the random bits extracted from the
> > double-SHA256 hash of the genesis block of the chain. (For colored
> > coins, the colored coin definition transaction would be used instead,
> > but I will address that in a separate proposal and will say just one
> > thing about it: adopting this method for identifying chains/coins will
> > greatly assist in adopting the payment protocol to colored coins.)
> This proposal seems closer to Version 5 than Version 4, in spirit.
> But given that useful content may be deduced from UUID, it is not
> truly applicable to either.  A bitcoin-specific version 6, if you
> will.
> > And some example chain identifiers:
> >
> >      mainnet:  UUID('6fe28c0a-b6f1-4372-81a6-a246ae63f74f')
> >      testnet3: UUID('43497fd7-f826-4571-88f4-a30fd9cec3ae')
> >      namecoin: UUID('70c7a9f0-a2fb-4d48-a635-a70d5b157c80')
> Note that, as this example unintentionally implies, humans are going
> to want a side-by-side mapping /anyway/, just to make it readable and
> usable to humans.
> Almost all useful multi-chain software will require a readable
> shortname string anyway, the thing this proposal wishes to avoid.
> --
> Jeff Garzik
> exMULTI, Inc.
> jgarzik at exmulti.com
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