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From: Pieter Wuille <pieter.wuille@gmail.com>
To: Wladimir <laanwj@gmail.com>
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Bitcoind-in-background mode for SPV wallets
Date: Thu, 10 Apr 2014 13:32:44 +0200	[thread overview]
Message-ID: <CAPg+sBjWL_hKhWW-6i=WAHnx+Ue5JE=A9RrxnWuAYOXw19qiDw@mail.gmail.com> (raw)
In-Reply-To: <CA+s+GJCQSCUyq7Ajv0EgZ8Vbcv4Xt7G-y_8D12fsoKjyFjnhwg@mail.gmail.com>

There were earlier discussions.

The two ideas were either using one or a few service bits to indicate
availability of blocks, or to extend addr messages with some flags to
indicate this information.

I wonder whether we can't have a hybrid: bits to indicate general
degree of availability of blocks (none, only recent, everything), but
indicate actual availability only upon actually connecting (through a
"version" extension, or - preferably - a separate message). Reason is
that the actual blocks available are likely to change frequently (if
you keep the last week of blocks, a 3-day old addr entry will have
quite outdated information), and not that important to actual peer
selection - only to drive the decision which blocks to ask after
connection.

On Thu, Apr 10, 2014 at 1:09 PM, Wladimir <laanwj@gmail.com> wrote:
> On Thu, Apr 10, 2014 at 8:04 AM, Tamas Blummer <tamas@bitsofproof.com>
> wrote:
>>
>> Serving headers should be default but storing and serving full blocks
>> configurable to ranges, so people can tailor to their bandwith and space
>> available.
>
>
> I do agree that it is important.
>
> This does require changes to the P2P protocol, as currently there is no way
> for a node to signal that they store only part of the block chain. Also,
> clients will have to be modified to take this into account. Right now they
> are under the assumption that every full node can send them every (previous)
> block.
>
> What would this involve?
>
> Do you know of any previous work towards this?
>
> Wladimir
>
>
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  parent reply	other threads:[~2014-04-10 11:32 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-09 15:29 [Bitcoin-development] Bitcoind-in-background mode for SPV wallets Wladimir
2014-04-09 15:37 ` Tamas Blummer
2014-04-09 15:41 ` Natanael
2014-04-09 15:54   ` Gregory Maxwell
2014-04-09 16:09     ` Thomas Voegtlin
2014-04-09 19:25       ` Wladimir
2014-04-10  6:04         ` Tamas Blummer
2014-04-10 11:09           ` Wladimir
2014-04-10 11:29             ` Mike Hearn
2014-04-10 11:32             ` Pieter Wuille [this message]
2014-04-10 11:43               ` Peter Todd
2014-04-10 11:50               ` Gregory Maxwell
2014-04-10 11:54                 ` Peter Todd
2014-04-10 17:30                   ` Tier Nolan
2014-04-11 16:54                     ` Gregory Maxwell
2014-05-04 21:11                       ` Tier Nolan
2014-04-09 17:31   ` Wladimir
2014-04-09 15:42 ` Brian Hoffman
2014-04-09 15:57   ` Gregory Maxwell
2014-04-09 16:09     ` Tamas Blummer
2014-04-09 15:47       ` Mark Friedenbach
2014-04-09 16:27         ` Tamas Blummer
2014-04-09 17:46           ` Peter Todd
2014-04-09 17:50             ` Tamas Blummer
2014-04-09 18:00               ` Mike Hearn
2014-04-09 18:19                 ` Wladimir
2014-04-09 18:35                   ` Justus Ranvier
2014-04-09 18:46                     ` Wladimir
2014-04-09 18:50                     ` Gregory Maxwell
2014-04-09 18:58                       ` Justus Ranvier
2014-04-09 19:33                         ` Gregory Maxwell
2014-04-09 20:12                           ` slush
2014-04-09 20:31                             ` slush
2014-04-09 20:36                               ` Mark Friedenbach
2014-04-09 21:04                                 ` Gregory Maxwell
2014-04-09 20:37                               ` Wladimir
2014-04-09 20:35                             ` Wladimir
2014-04-09 20:50                               ` slush
2014-04-09 20:55                             ` Laszlo Hanyecz
2014-04-10  6:38                             ` Mike Hearn
2014-04-10  6:50                               ` Wladimir
2014-04-10  7:09                                 ` Mike Hearn
2014-04-10  9:33                                   ` Peter Todd
2014-04-10  7:10                                 ` Tamas Blummer
2014-04-10  9:17                                   ` Mike Hearn
2014-04-10  9:39                                     ` Tamas Blummer
2014-04-10 10:40                                       ` Mike Hearn
2014-04-10 10:44                                         ` Tamas Blummer
2014-04-10 11:36                                           ` Peter Todd
2014-04-10 11:45                                             ` Mike Hearn
2014-04-10 11:52                                               ` Peter Todd
2014-04-10  9:47                                     ` Peter Todd
2014-04-09 18:04               ` Peter Todd
     [not found]   ` <CA+s+GJBpvqqu=XEojyekx5su+JfYLwz+zsbo8L0=5t6s-_b33w@mail.gmail.com>
2014-04-09 17:35     ` [Bitcoin-development] Fwd: " Wladimir
2014-04-09 16:03 ` [Bitcoin-development] " Peter Todd
2014-04-09 17:33   ` Alex Mizrahi
2014-04-09 17:38     ` Wladimir
2014-04-09 17:38     ` Peter Todd
2014-04-09 18:35 ` Kevin

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