Return-Path: Received: from smtp3.osuosl.org (smtp3.osuosl.org [IPv6:2605:bc80:3010::136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 1BE49C002F for ; Tue, 25 Jan 2022 16:23:18 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 0AF8560E50 for ; Tue, 25 Jan 2022 16:23:18 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org X-Spam-Flag: NO X-Spam-Score: -2.216 X-Spam-Level: X-Spam-Status: No, score=-2.216 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, NICE_REPLY_A=-0.117, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: smtp3.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DlEhoL4cMRXq for ; Tue, 25 Jan 2022 16:23:17 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.8.0 Received: from mail-wr1-x429.google.com (mail-wr1-x429.google.com [IPv6:2a00:1450:4864:20::429]) by smtp3.osuosl.org (Postfix) with ESMTPS id 4FE1A60E39 for ; Tue, 25 Jan 2022 16:23:17 +0000 (UTC) Received: by mail-wr1-x429.google.com with SMTP id v13so20858516wrv.10 for ; Tue, 25 Jan 2022 08:23:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:message-id:date:mime-version:user-agent:content-language:to :references:subject:in-reply-to:content-transfer-encoding; bh=sJsC3xT+YGzygaBci+FXhFvgH9MeNf1x6Q+fXZBE/tw=; b=VuCU5ugmtyrzQJ1HepCzRhhJcdMTpuE+8sFez3YQDC/Zh/OduXmjheeuWjSNTt4JPt FMxcd6/GpTi39MioYrMHlnqx24o/RniaFiPi8OtHkXQXL0C9bY7ZFCiJiM176sFsIJDp SvgpNnBAP1rq+4zDBJUQT7EbP522mcw4bfajk8aF7Fkl5NpeBdkkUbaUuRZ69b9b7Yxc qURUazv8mHKGBj23qdZIElbm/lTqewzkIrgWlM59H5cd0w7oOHOuyeDcA1Gudb7vTSd1 1PJihTfea3JtfHPh5+vYfNMMx//X9OIyPQBIMwPvCOk+p+mLfZYEy+V4Be3zsQ3a89AW T1cA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:message-id:date:mime-version:user-agent :content-language:to:references:subject:in-reply-to :content-transfer-encoding; bh=sJsC3xT+YGzygaBci+FXhFvgH9MeNf1x6Q+fXZBE/tw=; b=bTUsWdBbfknUgF9mZSYf8zvL4ZkTDXVcbi76IteBFHBKwdOAEtPO2J3AzPfgC5g79y MVsnIZ0qCuUiY+y4BgD6TyXexWbuBRXlJyS4Z1D+lc0GADQvuyi0Ot7Sx9SAUuq2mFCf f76hXJYYdrvUqKGTTvUcLSE9ohVbCry4WsIuBsNkeFjCOrH9hS0lfSE6D0Tn7Kg9SFWp HM5ewBgzelHSBUAS2e1lHCuhBqHg73a/lB4uuZM92+5kzDTq1l9w834XtZjoKxvm9o86 MWHdY6FXV+rt7wP6cTPSZzkJruya1iowYGfN6rxWmcjsJCnUphx6Z7YS1Dn6XXe5lxoN HGVA== X-Gm-Message-State: AOAM533s2FCc5HUHMXnjqZBOJLIDeuBcrH4jzjGV0MdIDDzuBS+6tuXS DY0kXBprYPHsiZjclwdKCN4= X-Google-Smtp-Source: ABdhPJz2KUWbY16pfBZJCb4dCwNg068fdD3WpyQBomUtg3RxBHZfCOkz87zOhZRtHjai8xOXysfPhw== X-Received: by 2002:a05:6000:1884:: with SMTP id a4mr19222828wri.316.1643127795498; Tue, 25 Jan 2022 08:23:15 -0800 (PST) Received: from [10.12.10.3] (190-2-132-141.hosted-by-worldstream.net. [190.2.132.141]) by smtp.googlemail.com with ESMTPSA id f8sm1033239wmg.44.2022.01.25.08.23.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Jan 2022 08:23:14 -0800 (PST) From: Jonas Nick X-Google-Original-From: Jonas Nick Message-ID: <2b316504-f785-b1b3-9ff9-8d781d6c0d9b@gmail.com> Date: Tue, 25 Jan 2022 16:24:21 +0000 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Content-Language: en-US-large To: Lloyd Fournier , dlc-dev@mailmanlists.org, Bitcoin Protocol Discussion References: In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Tue, 25 Jan 2022 16:27:20 +0000 Subject: Re: [bitcoin-dev] [dlc-dev] CTV dramatically improves DLCs X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jan 2022 16:23:18 -0000 Thank you, that's an interesting application of OP_CTV. Perhaps worth pointing out that this does not require OP_CTV but could also be enabled by other covenant constructions. For example, it seems like ANYPREVOUT-based covenants provide similar benefits. The script of the Taproot leaves could be set to CHECKSIGVERIFY CHECKSIGVERIFY where is an ANYPREVOUTANYSCRIPT signature of the CET for public key P = G. When using nonce R = G, signature creation has negligible computational cost (s = 1 + H(R, P, m)). A downside compared to CTV is the additional overhead of 64 witness bytes ().