From: Jonas Schnelli <dev@jonasschnelli.ch>
Message-Id: <6AC0929C-5E59-4BC1-A209-8CDC9C639B82@jonasschnelli.ch>
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Date: Mon, 19 Jun 2017 18:10:13 +0200
In-Reply-To: <oi8red$vbn$1@blaine.gmane.org>
To: Andreas Schildbach <andreas@schildbach.de>
References: <CAO3Pvs8ccTkgrecJG6KFbBW+9moHF-FTU+4qNfayeE3hM9uRrg@mail.gmail.com>
	<oi8e8k$g56$1@blaine.gmane.org>
	<537fb7106e0387c77537f0b1279cbeca@cock.lu>
	<oi8red$vbn$1@blaine.gmane.org>
Cc: bitcoin-dev@lists.linuxfoundation.org
Subject: Re: [bitcoin-dev] BIP Proposal: Compact Client Side Filtering for
 Light Clients
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> Just to give you a number: based on the statistics of the Bitcoin =
Wallet
> app there are at least 2 million wallets depending on BIP37. Not all
> would need instant notification but based on the daily support =
enquiries
> instant notificaton is the most asked property of Bitcoin.

Yes. Users probably like this feature and client side filtering is not a =
drop-in replacement for BIP37.

We should also consider:
BIP37 works, because node-operators are willing to offer that service =
for free (which maybe change over time).
BIP37 consumes plenty of horsepower (disk/cpu) from nodes. Filtering a =
couple of days of blocks (assume 1000+) eats lots of resources for =
something, that has no direct long-term value for Bitcoin (the filters =
data is unique and will be "thrown away=E2=80=9C [can=E2=80=99t be used =
by other peers]). Same applies for mempool (filtering mempool of a =
couple of hundred of mb each time the HD gap limit has been exceeded or =
the app gets sent to the foreground again).

Purely relying on the availability of BIP37 seems fragile to me and =
start to explore other ways is very reasonable.

/jonas

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