Return-Path: Received: from smtp2.osuosl.org (smtp2.osuosl.org [IPv6:2605:bc80:3010::133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 8CF18C0001 for ; Tue, 18 May 2021 12:22:20 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id 8178B401AD for ; Tue, 18 May 2021 12:22:20 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org X-Spam-Flag: NO X-Spam-Score: -2.299 X-Spam-Level: X-Spam-Status: No, score=-2.299 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, FROM_LOCAL_NOVOWEL=0.5, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: smtp2.osuosl.org (amavisd-new); dkim=pass (1024-bit key) header.d=protonmail.com Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KEE6x72ekUnE for ; Tue, 18 May 2021 12:22:19 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mail-40140.protonmail.ch (mail-40140.protonmail.ch [185.70.40.140]) by smtp2.osuosl.org (Postfix) with ESMTPS id 0D94E400EA for ; Tue, 18 May 2021 12:22:18 +0000 (UTC) Date: Tue, 18 May 2021 12:22:09 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonmail.com; s=protonmail; t=1621340536; bh=1h8+SXKycYqz3AoesCbFvHYzvHBn4c1X9NIO8Et3qC4=; h=Date:To:From:Cc:Reply-To:Subject:In-Reply-To:References:From; b=auTS5vc+U+et9sUjZIx7KhUZFIxguM2XY/k2uW5Syrzlvqxx5obN8Q60Rie1m+1Ch vtPNUfAOCbDRAPhrQN19sZvk5n1aGDKgkMBbrwXhWUlEG0+dgp/GzHE6xlmZqKBUZR xRzmder55pQXtAVcIn7wmLIF+H6JkPXJH3bPuhuA= To: "mike@powx.org" From: ZmnSCPxj Reply-To: ZmnSCPxj Message-ID: In-Reply-To: <864F983C-841D-4334-94F4-5A9F7D617B70@powx.org> References: <864F983C-841D-4334-94F4-5A9F7D617B70@powx.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Cc: Bitcoin Protocol Discussion , marshall ball Subject: Re: [bitcoin-dev] Proposal: Low Energy Bitcoin PoW 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, 18 May 2021 12:22:20 -0000 Good morning Michael, > Nothing in a dynamic system like PoW mining can be 100% anticipated, for = example there might be advanced in manufacturing of chips which are patente= d and so on.=C2=A0 > > It sounds like your take is that this means no improvements can ever be m= ade by any mechanism, however conservative. Not at all. Small-enough improvements over long-enough periods of time are expected and= anticipated --- that is why there exists a difficulty adjustment mechanism= . What is risky if a large-enough improvement over a short-enough time that o= verwhelms the difficulty adjustment mechanism. ASICBOOST was a massive enough improvement that it could be argued to poten= tially overwhelm this mechanism if it was not openly allowed for all miners= . > > We do go into a fair amount of detail about Minimum Effective Hardness in= our paper=C2=A0https://assets.pubpub.org/xi9h9rps/01581688887859.pdf=C2= =A0, which is actually a special case of hardness that we invented for the = context of adding an operation to a PoW, and how it applies to random matri= x mults. =C2=A0=C2=A0 This certainly helps as well. Regards, ZmnSCPxj