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| author | Peter Todd <pete@petertodd.org> | 2019-04-13 15:09:25 -0400 |
|---|---|---|
| committer | bitcoindev <bitcoindev@gnusha.org> | 2019-04-13 19:09:33 +0000 |
| commit | 49f9fe878cad777dc0e08d635a64b179827f9c30 (patch) | |
| tree | 3bd62d6f6b20d91de42db0b136a6f90f1837b647 | |
| parent | d62c4d64c2975cc3742212e21cbdca026d92b429 (diff) | |
| download | pi-bitcoindev-49f9fe878cad777dc0e08d635a64b179827f9c30.tar.gz pi-bitcoindev-49f9fe878cad777dc0e08d635a64b179827f9c30.zip | |
Re: [bitcoin-dev] assumeutxo and UTXO snapshots
| -rw-r--r-- | 78/b4ff9f39640adb2845958f1c623eec783d4808 | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/78/b4ff9f39640adb2845958f1c623eec783d4808 b/78/b4ff9f39640adb2845958f1c623eec783d4808 new file mode 100644 index 000000000..271676da0 --- /dev/null +++ b/78/b4ff9f39640adb2845958f1c623eec783d4808 @@ -0,0 +1,123 @@ +Return-Path: <user@petertodd.org> +Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org + [172.17.192.35]) + by mail.linuxfoundation.org (Postfix) with ESMTPS id 1D616B09 + for <bitcoin-dev@lists.linuxfoundation.org>; + Sat, 13 Apr 2019 19:09:33 +0000 (UTC) +X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 +Received: from outmail148101.authsmtp.com (outmail148101.authsmtp.com + [62.13.148.101]) + by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 6CE076C5 + for <bitcoin-dev@lists.linuxfoundation.org>; + Sat, 13 Apr 2019 19:09:32 +0000 (UTC) +Received: from mail-c237.authsmtp.com (mail-c237.authsmtp.com [62.13.128.237]) + by punt16.authsmtp.com. (8.15.2/8.15.2) with ESMTP id x3DJ9TGw066630; + Sat, 13 Apr 2019 20:09:29 +0100 (BST) + (envelope-from user@petertodd.org) +Received: from petertodd.org (ec2-52-5-185-120.compute-1.amazonaws.com + [52.5.185.120]) (authenticated bits=0) + by mail.authsmtp.com (8.15.2/8.15.2) with ESMTPSA id x3DJ9RMB073703 + (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); + Sat, 13 Apr 2019 20:09:28 +0100 (BST) + (envelope-from user@petertodd.org) +Received: from [127.0.0.1] (localhost [127.0.0.1]) + by petertodd.org (Postfix) with ESMTPSA id D48FE401EF; + Sat, 13 Apr 2019 19:09:26 +0000 (UTC) +Received: by localhost (Postfix, from userid 1000) + id B33D122282; Sat, 13 Apr 2019 15:09:25 -0400 (EDT) +Date: Sat, 13 Apr 2019 15:09:25 -0400 +From: Peter Todd <pete@petertodd.org> +To: Dave Scotese <dscotese@litmocracy.com>, + Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org> +Message-ID: <20190413190925.peux7djbopy5xu3t@petertodd.org> +References: <CAPfvXf+JS6ZhXUieWVxiaNa4uhhWwafCk3odMKy5F_yi=XwngA@mail.gmail.com> + <816FFA03-B4D9-4ECE-AF15-85ACBFA4BA8F@jonasschnelli.ch> + <CACiOHGxxqm5Qn8J9u5oDE5Ek5smqB4E4iz4PJOZHpJO5kwP=-A@mail.gmail.com> + <CAGLBAhf1NZfT9TunhHAb==mFTfaAacjekQh6Pqn4yBS+90Zw6A@mail.gmail.com> +MIME-Version: 1.0 +Content-Type: multipart/signed; micalg=pgp-sha256; + protocol="application/pgp-signature"; boundary="lgrhmog5d2dszyhv" +Content-Disposition: inline +In-Reply-To: <CAGLBAhf1NZfT9TunhHAb==mFTfaAacjekQh6Pqn4yBS+90Zw6A@mail.gmail.com> +User-Agent: NeoMutt/20170113 (1.7.2) +X-Server-Quench: a961d8a7-5e1f-11e9-960e-8434971169dc +X-AuthReport-Spam: If SPAM / abuse - report it at: + http://www.authsmtp.com/abuse +X-AuthRoute: OCd2Yg0TA1ZIVwkA IjsJECJaVQIpKltL GxAVKBZePFsRUQkR + aQdMdwEUGUUGAgsB Am8bWVReUFR7W2o7 bghPaBtcak9QXgdq + T0pMXVMcXAYcexVj e2weVRp1dwYIcX1w bAgzV3ZaCEwrclt4 + F08CCGwHMG59YWYf BV1QcwBQeQRLfxlM PgMxNiYHcQ5VPz4z + GA41ejw8IwAXIT9O XwQAME4CRg4CGDJ0 eiwyOn00G0QdXCU0 MwdO +X-Authentic-SMTP: 61633532353630.1024:706 +X-AuthFastPath: 0 (Was 255) +X-AuthSMTP-Origin: 52.5.185.120/25 +X-AuthVirus-Status: No virus detected - but ensure you scan with your own + anti-virus system. +X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,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 +X-Mailman-Approved-At: Sun, 14 Apr 2019 12:58:51 +0000 +Subject: Re: [bitcoin-dev] assumeutxo and UTXO snapshots +X-BeenThere: bitcoin-dev@lists.linuxfoundation.org +X-Mailman-Version: 2.1.12 +Precedence: list +List-Id: Bitcoin Protocol Discussion <bitcoin-dev.lists.linuxfoundation.org> +List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/bitcoin-dev>, + <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=unsubscribe> +List-Archive: <http://lists.linuxfoundation.org/pipermail/bitcoin-dev/> +List-Post: <mailto:bitcoin-dev@lists.linuxfoundation.org> +List-Help: <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=help> +List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev>, + <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=subscribe> +X-List-Received-Date: Sat, 13 Apr 2019 19:09:33 -0000 + + +--lgrhmog5d2dszyhv +Content-Type: text/plain; charset=us-ascii +Content-Disposition: inline +Content-Transfer-Encoding: quoted-printable + +On Wed, Apr 03, 2019 at 02:39:32PM -0700, Dave Scotese via bitcoin-dev wrot= +e: +> Every block's hash is smaller than the difficulty at that time. Block +> 569927's hash was VERY small (started with 21 zeros). The ratio of block +> hash to difficulty requirement (0xffffffff - difficulty, I think) could be +> used to identify blocks as "special," thus providing the opportunity to +> popularize unimportant but memorable-and-therefore-useful details. How c= +an +> they be useful if they are unimportant? They are useful for sanity +> checking. For example, if the drunken bishop walk (or some other popular +> randomart) produced by block 569927's hash looked like a face, that would +> be memorable: "The block with the smallest hash in 2019 (maybe ever?) loo= +ks +> like a face after the drunken bishop walk." + +As hashest smaller than the target have no significance to the Bitcoin +consensus I'd suggest not basing any features on that property. It's just as +arbitrary as picking whole decimal number block heights, yet has the additi= +onal +downsides of being harder to compute, and being likely to confuse people as= + to +how the Bitcoin consensus works. + +--=20 +https://petertodd.org 'peter'[:-1]@petertodd.org + +--lgrhmog5d2dszyhv +Content-Type: application/pgp-signature; name="signature.asc" + +-----BEGIN PGP SIGNATURE----- + +iQEzBAEBCAAdFiEEFcyURjhyM68BBPYTJIFAPaXwkfsFAlyyM+AACgkQJIFAPaXw +kfusDgf+JS+zj8pRV0Nd5ryPQqisQdTGZn7RXrza/Fp+AH9yhxya62n5uvMc3Bgf +U3tnwGNjeJu+wexk0fQN8RVA7Yp4tvqpTVtGxxCjtY7h/RQ9piQObaQlP0YYv8pk +Lm7E6hM6hResz/LM2GDD/2mKL7iLQyPS9QkXJdk4sQSiR4H1EiQXeOqD34cqluLP +qWo5eNAuG4dWriKtAPxfly0MfPo9PISCjmhz6AVV3whdryQ2hQV11p/dBMloDJ+0 +APovks3qqQczc6/rgJURNRWnSP38Wp6z/pqBeH5iYObdFRa3heCYSZC99l/iuSNj +qxVPViLJ03kspZegnvkiNTVCxu4sdA== +=NKki +-----END PGP SIGNATURE----- + +--lgrhmog5d2dszyhv-- + |