References: <CA+8xBpefOgtuECJqoAtbFfPnmkFEHTL=6Uqf=kb7NB=fnV863Q@mail.gmail.com>
	<CAMGNxUsZQMN+M4cR8nMhNmJAAnT2ZSPjrMHV0BetdiMmj453sA@mail.gmail.com>
	<CA+8xBpdbgkzwOvyUsJYEXNMTBwuvAbFsKx2xF1s0BMPiL9n1Qw@mail.gmail.com>
	<CACh7GpFb8Xxn9KmR34UNw6N=P96TJSgqec+eLdr5KneZAOj9Tw@mail.gmail.com>
Message-ID: <1341604960.84829.YahooMailNeo@web121006.mail.ne1.yahoo.com>
Date: Fri, 6 Jul 2012 13:02:40 -0700 (PDT)
From: Amir Taaki <zgenjix@yahoo.com>
To: "bitcoin-development@lists.sourceforge.net"
	<bitcoin-development@lists.sourceforge.net>
In-Reply-To: <CACh7GpFb8Xxn9KmR34UNw6N=P96TJSgqec+eLdr5KneZAOj9Tw@mail.gmail.com>
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Subject: Re: [Bitcoin-development] BIP 34: Block v2, Height in Coinbase
Precedence: list
Reply-To: Amir Taaki <zgenjix@yahoo.com>

It would be nice if Bitcoin was engineered this way from the start. The amount of workarounds, special cases and code bloat to deal with the fact that txs are non-unique was a massive headache for me.


________________________________
From: Mark Friedenbach <mark@monetize.io>
To: Jeff Garzik <jgarzik@exmulti.com> 
Cc: Bitcoin Development <bitcoin-development@lists.sourceforge.net> 
Sent: Friday, July 6, 2012 6:56 PM
Subject: Re: [Bitcoin-development] BIP 34: Block v2, Height in Coinbase


On Fri, Jul 6, 2012 at 9:49 AM, Jeff Garzik <jgarzik@exmulti.com> wrote:

On Fri, Jul 6, 2012 at 12:45 PM, Peter Vessenes <peter@coinlab.com> wrote:
>> The proposal is simple, and it's a small change for miners, I imagine.
>>
>> My question is: why?
>>
>> I worry about stuffing too many requirements on the coinbase. I suppose
>> the coinbase is easily extendible if we run out of bytes, but I think I'd
>> like to see some more discussion / good / bad type cases for making this
>> change. What do we get over just the prev_hash by doing this?
>
>With the existing setup (sans height in coinbase), you might not have
>unique transactions, with all that entails.
>

But those issues are solvable through other, non-backwards incompatible means. For example, mandate that a <transaction hash, output index> refers to the first such pair that is not already spent. No?

Mark
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