From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id E293990 for ; Thu, 22 Oct 2015 08:57:30 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-ig0-f179.google.com (mail-ig0-f179.google.com [209.85.213.179]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 88BDB63 for ; Thu, 22 Oct 2015 08:57:30 +0000 (UTC) Received: by igbhv6 with SMTP id hv6so55519022igb.0 for ; Thu, 22 Oct 2015 01:57:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=ZnmcIIBpmv0MQgT6jTsfzKg+ySZvBiZhTPK7C9JlI2k=; b=oTOT18B9FuFFZYwPiSc/ytcCBhg5NXnzP+Lxx6jbEMbGuqT5H4XTkRoENicZCD+JQH 4gMOR2tJo0pmk2ewjSo6IDMrSi1N9qk1xYqvQszJqftIxIY1FvBAz1pmfJkECSRyFO3x sdyrVwEtU/s2nxRW30Qq6QN29TVhiEg6TIE1nIpRHcjW3YvEqbRE5Y0cdRoYp2BSlUJ2 JhaB/bqUldqRDTlT/Y4snEEEX78Q2QrLzftmNO+cWxhY5H/qTH9Z1JU4NA+NTQehDSjy 3vIaxnMX32XuZDhMhB7oixru39T+5MZ8daZ7Ysfu7OoVwfypdxzFX7eQN2eC0AitpJZi JVmA== MIME-Version: 1.0 X-Received: by 10.50.56.71 with SMTP id y7mr2848766igp.48.1445504250000; Thu, 22 Oct 2015 01:57:30 -0700 (PDT) Received: by 10.107.23.197 with HTTP; Thu, 22 Oct 2015 01:57:29 -0700 (PDT) In-Reply-To: References: <201510210846.43988.luke@dashjr.org> <201510212320.31052.luke@dashjr.org> Date: Thu, 22 Oct 2015 08:57:29 +0000 Message-ID: From: Gregory Maxwell To: Christian Decker Content-Type: text/plain; charset=UTF-8 X-Spam-Status: No, score=-2.7 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org X-Mailman-Approved-At: Thu, 22 Oct 2015 11:27:51 +0000 Cc: Bitcoin Dev Subject: Re: [bitcoin-dev] [BIP] Normalized transaction IDs X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Development Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Oct 2015 08:57:31 -0000 On Thu, Oct 22, 2015 at 8:26 AM, Christian Decker via bitcoin-dev wrote: > Normalized transaction IDs do help in the case that the single signer wants > to immediately follow up its transaction with another transaction spending > the first one's change output, and it prevents any modification in the > multi-signer scenario. For ordinary transactions which are not performing interesting smart contracts that particular is better addressed via canonical encoding, which is immediately available and doesn't have the associated costs (new pubkey type adoption, 20%-30% UTXO size increase, need for nodes to fixup txid references, etc.). Please, as I said up-thread: this is good and importantstuff to work on, but it shouldn't be oversold.