Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 54BB6EEF for ; Sun, 18 Mar 2018 05:50:38 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-pg0-f54.google.com (mail-pg0-f54.google.com [74.125.83.54]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id D8D725D0 for ; Sun, 18 Mar 2018 05:50:37 +0000 (UTC) Received: by mail-pg0-f54.google.com with SMTP id d1so5676758pgv.2 for ; Sat, 17 Mar 2018 22:50:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=eklitzke-org.20150623.gappssmtp.com; s=20150623; h=references:user-agent:from:to:subject:in-reply-to:date:message-id :mime-version; bh=NAq7zK9FKGIYOLWFS1CxiRatOCm6CGnlsba6ivJpDJg=; b=IaBVuJ2ytVfrVpCQACQ79WJplPs8NSBQnI8uD0YUo0mdzBk+HYyMZHqhdE4qs4qG0I knRopsn9gjge76rwsTFSvFLEbbmcHeIdeDZsdqP3/2cABhlufeACVqi51d7v5c2HZgXW EuHfYEFClfBlrG7A9M0mkTdM2vQfJdGPYuY1i+uf1Nm72q0JXth0+SzWNcIjVD7hXD0y 458saO/Ar6DthUGyLkGj/WTrVlI15Z6bvV8YL20fvuubzchmbEkG1VZFkot4nD3JbzaX 9Iw97VVDAV22btUT0/Uv/H+xRG71oQHw8KIaTplMjeMnrdKqDVx7KMcYknnh6siFff9A DisA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:references:user-agent:from:to:subject :in-reply-to:date:message-id:mime-version; bh=NAq7zK9FKGIYOLWFS1CxiRatOCm6CGnlsba6ivJpDJg=; b=dc1DIjNZOWbT4VsSSmhatPAueR/KCT1YlVZ88rPEWhBV6z3wHexoepaYBGf7tN4FXj dmanIskfLOp2oSF0Qf8uW6s+49/pt05eYq5MYN85ShzichoFM4U7ueELvNKB1NiNQRU5 0GOJ+d2DxLbL7ntI7lsZ15xlD24PVM1LgaO63Hky9C92DpO/M49d4qjhTaMrIkmkXKxa xRjZliMMaoJyW35rQspOJTnHVFTSiGnENdCTLVFLEXWSfOQ5DYeCiUVs8E4G79HsfQoB yT3w1LcE1CzIxYdhAI4S8X/7CMpmBnFo1vzpV5nt0ucWz+AIl4OV6OkLQQx7mCD3ZBP7 ttyA== X-Gm-Message-State: AElRT7FXfaHuVu4r9OBtCmtNE6C1d6sCaX2npmhwGdzoLtkKmagqdnRz xU5tck8oRvIFtvomNbyME0q7ZqKzylk= X-Google-Smtp-Source: AG47ELv+LTnXTvCulQTJHyEG+qNuTBsGBdZWUb33yqggdlFnTROKDiN8hyX+QzXx4H5v80e1CroW5g== X-Received: by 10.99.121.73 with SMTP id u70mr6007352pgc.232.1521352236975; Sat, 17 Mar 2018 22:50:36 -0700 (PDT) Received: from t460s (hacker.monad.io. [75.101.96.6]) by smtp.gmail.com with ESMTPSA id a6sm20561299pfi.22.2018.03.17.22.50.35 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 17 Mar 2018 22:50:35 -0700 (PDT) References: User-agent: mu4e 1.0; emacs 25.3.1 From: Evan Klitzke To: Damian Williamson , Bitcoin Protocol Discussion In-reply-to: Date: Sat, 17 Mar 2018 22:50:34 -0700 Message-ID: <874lleexud.fsf@eklitzke.org> MIME-Version: 1.0 Content-Type: text/plain; format=flowed X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE 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: Sun, 18 Mar 2018 12:13:29 +0000 Subject: Re: [bitcoin-dev] feature: Enhance privacy by change obfuscation X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 18 Mar 2018 05:50:38 -0000 Damian Williamson via bitcoin-dev writes: > Operation: Provide a user selectable 'Enhanced privacy' option for > transaction creation, when true the transaction randomly distributes > change across up to twenty output addresses (minimum five?), provided > each output is not dust. This would be really expensive for the network due to the bloat in UTXO size, a cost everyone has to pay for. Not to mention the fact that it doesn't really seem that private, as the wallet is likely going to have to rejoin those inputs in future transactions (and the user will have to pay a high transaction fee as a result). -- Evan Klitzke https://eklitzke.org/