From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1WY864-0008V8-51 for bitcoin-development@lists.sourceforge.net; Thu, 10 Apr 2014 06:04:24 +0000 X-ACL-Warn: Received: from wp059.webpack.hosteurope.de ([80.237.132.66]) by sog-mx-4.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1WY862-0003zu-7j for bitcoin-development@lists.sourceforge.net; Thu, 10 Apr 2014 06:04:24 +0000 Received: from [37.143.74.116] (helo=[192.168.2.2]); authenticated by wp059.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.0:RSA_AES_128_CBC_SHA1:16) id 1WY85v-0002He-SL; Thu, 10 Apr 2014 08:04:15 +0200 Content-Type: multipart/signed; boundary="Apple-Mail=_02F48C3C-CDBF-4468-97B7-A12E47A46B2C"; protocol="application/pgp-signature"; micalg=pgp-sha1 Mime-Version: 1.0 (Mac OS X Mail 7.2 \(1874\)) From: Tamas Blummer In-Reply-To: Date: Thu, 10 Apr 2014 08:04:28 +0200 Message-Id: <0B038624-8861-438E-B7B1-566B4A8E126B@bitsofproof.com> References: <534570A2.9090502@gmx.de> To: Wladimir X-Mailer: Apple Mail (2.1874) X-bounce-key: webpack.hosteurope.de; tamas@bitsofproof.com; 1397109862; 9ace44eb; X-Spam-Score: 1.0 (+) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. 1.0 HTML_MESSAGE BODY: HTML included in message X-Headers-End: 1WY862-0003zu-7j Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] Bitcoind-in-background mode for SPV wallets X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Apr 2014 06:04:24 -0000 --Apple-Mail=_02F48C3C-CDBF-4468-97B7-A12E47A46B2C Content-Type: multipart/alternative; boundary="Apple-Mail=_70F2039E-A332-409C-88EC-E601F065003B" --Apple-Mail=_70F2039E-A332-409C-88EC-E601F065003B Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Hi Wladimir, If the motivation of the SPV wallet is to radically extend = functionality, as in my case, then the index is specific to the added = features and the subset of the blockchain that is of interest for the = wallet. As you also point out, adding huge generic purpose indices to core would = rather discourage people using full nodes due to excess requirements.=20 I believe nothing would add more to the core=92s popularity as a trusted = background node to SPV than full validation at lowest possible memory, = disk and CPU footprint. Serving headers should be default but storing and serving full blocks = configurable to ranges, so people can tailor to their bandwith and space = available. Tamas Blummer Bits of Proof On 09.04.2014, at 21:25, Wladimir wrote: >=20 >=20 > Adding a RPC call for a "address -> utxo" query wouldn't be a big = deal. It has been requested before for other purposes as well, all the = better if it helps for interaction with Electrum. >=20 > Spent history would be involve a much larger index, and it's not = likely that will end up in bitcoin >=20 > Wladimir >=20 --Apple-Mail=_70F2039E-A332-409C-88EC-E601F065003B Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 Hi = Wladimir,

If the motivation of the SPV wallet is to = radically extend functionality, as in my case, then the index is = specific to the added features and the subset of the blockchain that is = of interest for the wallet.
As = you also point out, adding huge generic purpose indices to core would = rather discourage people using full nodes due to excess = requirements. 

I believe nothing would add more to the = core=92s popularity as a trusted background node to SPV than full = validation at lowest possible memory, disk and CPU footprint.
Serving headers should be default but = storing and serving full blocks configurable to ranges, so people can = tailor to their bandwith and space available.

Tamas Blummer
Bits of = Proof

On 09.04.2014, at 21:25, Wladimir <laanwj@gmail.com> = wrote:


Adding a RPC call for a "address -> utxo" query = wouldn't be a big deal. It has been requested before for other purposes = as well, all the better if it helps for interaction with Electrum.

Spent history would = be involve a much larger index, and it's not likely that will end up in = bitcoin

Wladimir


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