Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id EBDAF8D9 for ; Fri, 7 Apr 2017 19:42:23 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-ua0-f173.google.com (mail-ua0-f173.google.com [209.85.217.173]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 78E0218E for ; Fri, 7 Apr 2017 19:42:23 +0000 (UTC) Received: by mail-ua0-f173.google.com with SMTP id u103so825900uau.1 for ; Fri, 07 Apr 2017 12:42:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=pm+8U7elx94QDCUXkRcfexNlPJfegh+IPb5j0Af3kOE=; b=ohFj3i0nsNCtQYsHLi8dbL8L0zXzVrs0Krcu9Ad2NCF0W8+OOMCEZ4p9M168aNDRsk TVMLU1FxP0v9WsR/iqPN5z0XxGZWKR3BIf4fTTN5pnANmZU909Er+q5hjvjV0aeLr2hh WDjvqo0tAbqYvoqZ7HRD+qvpm3Rz2EOUL/252nlm/KiPE6268vVZuBHglcCjfVteAxCm mOnn/Er7Io3zw7BCiXTtPfZr09FvVa586cm4tHDzKqGNWSGw/qE2WoBRwOpFJq2JUoX2 625c5OjxcvU9KB2PXa8G8ealJL71E5hiHnqUOR9YLX1iMbVZEXoPtDw7iOH2UgtqOnIm T12Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=pm+8U7elx94QDCUXkRcfexNlPJfegh+IPb5j0Af3kOE=; b=bvwVK2LwRvU3Pns+rrq5WXzrnA4EvP6KeGbivZbT+4eiUBvrFe7wnHDD0fNf1qK/Z+ M4k+K12Psy9FaT/zRkkJWj4/MMAFrBhABjKAvLontPzQ/iggtKkV/Y46hCThmvH3ZTv1 Gn+5peomOR7PBaIn5kdiiYGi4uJHkzAFZhnqQk4ELSPiPi8JypMnQk13kHcFGNx8bONy CgjSZJYp+wilRjDxPhg8JBNmDp2vuGp2sEWk/XJQLpKWIC+keg1zEXLi6Jwighn4uD1Z 94FpkAES0jSCCSvLZPJysrxuEkEMfBm/xiirC/GqnbjiFlugCm5v5cp6RDWB24Q6f4bT SE1A== X-Gm-Message-State: AFeK/H2KgvR2sghSl2SO+HfsWZ2mz8/B5E5oxGz7NWEkVG5JYb3k+7Nll3ujMVoSwwBPXiynqCmb3r5RU3a/lg== X-Received: by 10.176.70.26 with SMTP id m26mr11534252uaa.167.1491594142551; Fri, 07 Apr 2017 12:42:22 -0700 (PDT) MIME-Version: 1.0 Sender: gmaxwell@gmail.com Received: by 10.103.152.203 with HTTP; Fri, 7 Apr 2017 12:42:22 -0700 (PDT) In-Reply-To: References: <1491516747.3791700.936828232.69F82904@webmail.messagingengine.com> <1491526132.723002.936945760.06A943C6@webmail.messagingengine.com> <1491528547.734012.936970328.62366FA5@webmail.messagingengine.com> From: Gregory Maxwell Date: Fri, 7 Apr 2017 19:42:22 +0000 X-Google-Sender-Auth: CLB5ShlPPULWlyEM71HoFyw2tNo Message-ID: To: Tom Harding , Bitcoin Protocol Discussion Content-Type: text/plain; charset=UTF-8 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, FREEMAIL_FROM, 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 Subject: Re: [bitcoin-dev] Using a storage engine without UTXO-index 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: Fri, 07 Apr 2017 19:42:24 -0000 On Fri, Apr 7, 2017 at 6:52 PM, Tom Harding via bitcoin-dev wrote: > A network in which many nodes maintain a transaction index also enables a > class of light node applications that ask peers to prove existence and > spentness of TXO's. Only with the additional commitment structure such as those proposed by Peter Todd in his stxo/txo commitment designs, e.g. https://petertodd.org/2016/delayed-txo-commitments