From: Amir Taaki <zgenjix@yahoo•com>
To: "bitcoin-development@lists•sourceforge.net"
<bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] New P2P commands for diagnostics, SPV clients
Date: Fri, 15 Jun 2012 11:42:32 -0700 (PDT) [thread overview]
Message-ID: <1339785752.91313.YahooMailNeo@web121004.mail.ne1.yahoo.com> (raw)
In-Reply-To: <CANEZrP39RHfCDX-x4ARo+oPphLv-70RxuMh3+AJzsNPxzOd=bA@mail.gmail.com>
Why though? The bottleneck is not network traffic but disk space usage/blockchain validation time.
----- Original Message -----
From: Mike Hearn <mike@plan99•net>
To: Jeff Garzik <jgarzik@exmulti•com>
Cc: Bitcoin Development <bitcoin-development@lists•sourceforge.net>
Sent: Friday, June 15, 2012 3:43 PM
Subject: Re: [Bitcoin-development] New P2P commands for diagnostics, SPV clients
> Yes, the format is something that must be hashed out (no pun
> intended). Need input from potential users about what information
> they might need.
Matts point that a branch-per-transaction may duplicate data is well
made, that said, I suspect a format that tries to fix this would be
much more complicated.
How about see this project as a three part change?
First step - add the mempool command and make nodes sync up their
mempools on startup.
Second step - if protocol version >= X, the "block" message consists
of a header + num transactions + vector<hash> instead of the full
transactions themselves.
On receiving such a block, we go look to see which transactions we're
missing from the mempool and request them with getdata. Each time we
receive a tx message we check to see if it was one we were missing
from a block. Once all transactions in the block message are in
memory, we go ahead and assemble the block, then verify as per normal.
This should speed up block propagation. Miners have an incentive to
upgrade because it should reduce wasted work.
Third step - new message, getmerkletx takes a vector<hash> and returns
a merkletx message: "merkle branch missing the root + transaction data
itself" for each requested transaction. The filtering commands are
added, so the block message now only lists transaction hashes that
match the filter which can then be requested with getmerkletx.
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next prev parent reply other threads:[~2012-06-15 18:42 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-13 20:46 Jeff Garzik
2012-06-14 11:52 ` Mike Hearn
2012-06-15 11:52 ` Mike Hearn
2012-06-15 13:19 ` Matt Corallo
2012-06-15 13:23 ` Mike Hearn
2012-06-15 14:39 ` Matt Corallo
2012-06-16 8:27 ` Mike Hearn
2012-06-19 19:09 ` Matt Corallo
2012-07-21 11:45 ` Mike Hearn
2012-07-23 7:54 ` Andreas Petersson
2012-07-23 16:40 ` Matt Corallo
2012-07-24 8:16 ` Mike Hearn
2012-06-15 13:26 ` Jeff Garzik
2012-06-15 13:43 ` Mike Hearn
2012-06-15 14:56 ` Matt Corallo
2012-06-15 15:32 ` Jeff Garzik
2012-06-15 16:20 ` Matt Corallo
2012-06-15 18:42 ` Amir Taaki [this message]
2012-06-16 8:25 ` Mike Hearn
2012-06-15 15:43 ` Simon Barber
2012-06-15 16:40 ` Jeff Garzik
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