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 63C0C89E for ; Sun, 15 Nov 2015 03:17:19 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 6289611C for ; Sun, 15 Nov 2015 03:17:18 +0000 (UTC) Received: from [192.168.50.29] ([69.50.179.106]) by mail.gmx.com (mrgmx103) with ESMTPSA (Nemesis) id 0MVedf-1ZtYQS0y2J-00YzuY; Sun, 15 Nov 2015 04:17:11 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) From: Peter R In-Reply-To: <201511150304.41003.luke@dashjr.org> Date: Sat, 14 Nov 2015 19:17:08 -0800 Content-Transfer-Encoding: quoted-printable Message-Id: References: <5631C363.5060705@neomailbox.net> <571D9B7F-077D-4B80-B577-1C18FF2ECF31@gmx.com> <201511150304.41003.luke@dashjr.org> To: Luke Dashjr X-Mailer: Apple Mail (2.2104) X-Provags-ID: V03:K0:TuQFOSXxAHIy48qrbfbrYDa4qzKkFj94NhPVqJ1DAjD11IR5mNo fALDWiVeIh1/MU0oNP1v0rAIkB9pcNIQeZ4eIVFASL45ZLSlkpWwwdIdjnk33d1J0E+owtH Z1+KiiauT4BCHRt5Prpb0hb76zMAO5GNCIl8NPk6shsESipwYqUo3sUo+8vHPrDbjq2CYLP Cv3WgXjjOAyPm2rZRprKg== X-UI-Out-Filterresults: notjunk:1;V01:K0:Mnhvomf/0Tw=:CotC+ATnPo/CD+B/RMHJYB R82+DCoPv35mOHl+sRlSFXoGKTzoXxfNZ/yyXgsKkelGMeEWoUoco+eCdZWX7435fvcmjWMIl uNEUPIRFUzXNeJ8Z6orrgiWFfkelpU11LT9V2I2slSGvXD3pvIRg6K16mry0nqtz295Or5Ntq MFPyfUdTKGwuG6lLJcNuak+d5kZiKYpHNTMWroVp4LFm7O2icGPzujlWR+aik5t570CYI4BUn +lMYf7FvsbP1FR94nYOTKwh8awvdCiHaISTIKkPhAVGTgUcOV7swqlxpsN4OEDPKuDsGzZQhZ DGE2fhrKwrCC7HlnNbU/+CIpMbQeQHHJicVjNcXDWW0FOhWGul5K1zT63b0nn/klXOYtFV9CH 0+2Vt6t0arBil2VXcc3fCDd0B8OBPieXtZF7Nai1qdnkMC6vrnj9dpo0XrNK2Wk8uRlm3edlG zmaRFWGMhCzpFMM0tKI6Xof9WN+yrPWyBaWO+VxGuPIdJbYNG2KygnIucNnOPWsJmHKpNSZaI 0yv3WSXtuhXLQBLv5IWQp0CDogYb4NPOQy4zzSrueVoZRFmxALPnZsGbPiNQzD/Qy4rSZgPkH RTwlfzwSYCGsOOLBFk+kwB9fkmkXfRJFQrfmsp6kaPrRGnCl1qVmhT9aeyWCSqide4bkQoMJw n3phF0MDOyi1SMrEBjACZZgDKp7H3FoFF1+kJXCA1bnA6rCchiXrjIMMhKF8gJZPkjmLYSYd8 ilef+lF43tRlgPqZJx41jb4FJ7bBQeKIijtw/z2q0xWYmBapJjR9sIF9bmVck57sPKZw93erq U28Kvs8 X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,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 Cc: bitcoin-dev@lists.linuxfoundation.org, telemaco Subject: Re: [bitcoin-dev] [patch] Switching Bitcoin Core to sqlite db 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: Sun, 15 Nov 2015 03:17:19 -0000 > On Sunday, November 15, 2015 1:02:33 AM Peter R via bitcoin-dev wrote: >> A group of us have been exploring this =E2=80=9Cmeta-cognition=E2=80=9D= idea with Bitcoin >> Unlimited. For example, Bitcoin Unlimited can be (optionally) made = to >> automatically fork to the longest chain if it =E2=80=9Cgets stuck=E2=80= =9D and can neither >> prove that a block is valid nor that the block is invalid. >=20 > This situation isn't something that can be ignored and simply moved = past. If=20 > you can't determine the validity of a block, you also cannot process = its=20 > results correctly. Taking for example the BDB/LevelDB issue, the = result was=20 > that BDB failed to accept further changes to the UTXO set. Unless the = UTXO set=20 > could be updated correctly, there is no way to even attempt to = validate the=20 > next block or any new transactions. Great point, Luke!=20 Indeed, whether the program can or cannot continue after a Type 1 = consensus mismatch depends on the specifics of the situation and exactly = how the code was written. But I agree: there are cases where the = program *can=E2=80=99t* continue. In those cases it would halt. This = would require manual intervention to fix but avoids the problem of = potential double-spends during the fork event. This would be preferable = to knowingly causing a fork. =20 Peter=