Forgot to mention: The link I sent is to a branch that is patched to produce the filter stats. This is the main project and the BIP158 implementation: https://github.com/rust-bitcoin/rust-bitcoin-spv/blob/master/src/blockfilter.rs
Tamas Blummer > On May 28, 2018, at 20:18, Tamas Blummer <tamas.blum...@gmail.com> wrote: > > Hi Jim, > > A “basic” 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. > > 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. > > I think that the data supports separation of filters as a combined filter > does not seem to come with significant savings. (basic size ~= txid + input > points + output scripts sizes) > > My calculations are repeatable with: > > https://github.com/tamasblummer/rust-bitcoin-spv/blob/blockfilterstats/src/bin/blockfilterstats.rs > > 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. > > Tamas Blummer > > > <filters.png> > >> On May 24, 2018, at 05:48, Jim Posen via bitcoin-dev >> <bitcoin-dev@lists.linuxfoundation.org> wrote: >> >> Greg, I've attached a graph including the input scripts. >> >> 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. >> > _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
