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[2003:e3:8f2e:7304:9c12:9df0:e03:e475]) by smtp.gmail.com with ESMTPSA id k5-v6sm31375473wrd.13.2018.05.28.11.28.17 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 28 May 2018 11:28:17 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) From: Tamas Blummer In-Reply-To: <7E4FA664-BBAF-421F-8C37-D7CE3AA5310A@gmail.com> Date: Mon, 28 May 2018 20:28:16 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <22d375c7-a032-8691-98dc-0e6ee87a4b08@mattcorallo.com> <7E4FA664-BBAF-421F-8C37-D7CE3AA5310A@gmail.com> To: Jim Posen , Bitcoin Protocol Discussion X-Mailer: Apple Mail (2.3273) X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, 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 X-Mailman-Approved-At: Mon, 28 May 2018 18:53:39 +0000 Subject: Re: [bitcoin-dev] BIP 158 Flexibility and Filter Size 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: Mon, 28 May 2018 18:28:20 -0000 Forgot to mention: The link I sent is to a branch that is patched to = produce the filter stats.=20 This is the main project and the BIP158 implementation: = https://github.com/rust-bitcoin/rust-bitcoin-spv/blob/master/src/blockfilt= er.rs Tamas Blummer > On May 28, 2018, at 20:18, Tamas Blummer = wrote: >=20 > Hi Jim, >=20 > A =E2=80=9Cbasic=E2=80=9D combined filter would mean up to 0.5 GB = filter data per month (with 100% segwith use). Considering that 1 GB is = the usual data quota for an entry level mobile phone contract, this = could be a too high barrier for adoption. >=20 > I repeated your calculations and produced a slightly different graph = that shows the fraction of cummulative filter size to cummulative = blockchain size. This is less noisy but otherwise confirms your = measurement. >=20 > I think that the data supports separation of filters as a combined = filter does not seem to come with significant savings. (basic size ~=3D = txid + input points + output scripts sizes) > =20 > My calculations are repeatable with: >=20 > = https://github.com/tamasblummer/rust-bitcoin-spv/blob/blockfilterstats/src= /bin/blockfilterstats.rs >=20 > that is using a Rust implementation of an SPV client built on top of = other libraries we work on in the rust-bitcoin GitHub community = (https://github.com/rust-bitcoin). Yes, this is a shameles plug for the = project hoping to attract more developer. >=20 > Tamas Blummer >=20 >=20 > >=20 >> On May 24, 2018, at 05:48, Jim Posen via bitcoin-dev = wrote: >>=20 >> Greg, I've attached a graph including the input scripts. >>=20 >> In the top graph, we can see how the input script filter compares to = the input outpoint filter. It is definitely smaller as a result of = address reuse. The bottom graph shows the ratio over time of combining = the input prev script and output script filters vs keeping them = separate. In more recent blocks, it appears that there are decreasing = savings. >>=20 >=20