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From: Tamas Blummer <tamas@bitsofproof.com>
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Date: Wed, 9 Apr 2014 19:50:03 +0200
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To: Peter Todd <pete@petertodd.org>
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Cc: bitcoin-development@lists.sourceforge.net
Subject: Re: [Bitcoin-development] Bitcoind-in-background mode for
SPV wallets
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Block header has to be available in SPV and also in an UTXO only storing =
core node, so why not serve it if bandwith allows.
Serving any additional information like known peer adresses or known =
full blocks is certainly beneficial and should be offered if at hand.
Regards,
Tamas Blummer
http://bitsofproof.com
On 09.04.2014, at 19:46, Peter Todd <pete@petertodd.org> wrote:
> Signed PGP part
>=20
>=20
> On 9 April 2014 12:27:13 GMT-04:00, Tamas Blummer =
<tamas@bitsofproof.com> wrote:
> >A border router that is not able to serve blocks is still protecting
> >consensus rules, that SPVs do not.
> >If the network would only consist of SPV nodes only then e.g. a
> >majority coalition of miner could increase their reward at will.
> >
> >Archives need a different solution.
>=20
> Any collective group that has a majority of hashing power will have no =
major issues running enough nodes that follow their rules to make SPV =
insecure anyway.
>=20
> There's no good reason not to have SPV security nodes distribute block =
chain data, particularly block headers. It helps provide redundancy in =
the network topology and helps provide more resources for full nodes to =
sync up faster. For instance in a network with a large number of partial =
UTXO set nodes if those nodes are forwarding block data to each other =
they can get enough data to become fully fledged full nodes without =
putting all the load on the existing full nodes. This is a good thing.
>=20
>=20
>=20
--Apple-Mail=_3904231C-30E5-4CED-858C-47877849F81A
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Block =
header has to be available in SPV and also in an UTXO only storing core =
node, so why not serve it if bandwith allows.<br><div =
apple-content-edited=3D"true"><br></div><div =
apple-content-edited=3D"true">Serving any additional information like =
known peer adresses or known full blocks is certainly beneficial and =
should be offered if at hand.</div><div apple-content-edited=3D"true"><br =
style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; text-align: -webkit-auto; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; widows: =
2;"><span style=3D"color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; text-align: =
-webkit-auto; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; =
widows: 2; float: none; display: inline !important;">Regards,</span><br =
style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; text-align: -webkit-auto; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; widows: =
2;"><br style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; text-align: -webkit-auto; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; widows: =
2;"><span style=3D"color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; text-align: =
-webkit-auto; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; =
widows: 2; float: none; display: inline !important;">Tamas =
Blummer</span><br style=3D"color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; text-align: =
-webkit-auto; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; =
widows: 2;"><span style=3D"color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: =
0px;"><span style=3D"color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant: normal; font-weight: =
normal; letter-spacing: normal; line-height: normal; text-align: =
-webkit-auto; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; =
widows: 2; float: none; display: inline !important;"><a =
href=3D"http://bitsofproof.com">http://bitsofproof.com</a></span>
</span></div>
<br><div><div>On 09.04.2014, at 19:46, Peter Todd <<a =
href=3D"mailto:pete@petertodd.org">pete@petertodd.org</a>> =
wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite"><fieldset style=3D"padding-top:10px; border:0px; border: =
3px solid #CCC; padding-left: 20px;"><legend =
style=3D"font-weight:bold">Signed PGP part</legend><div =
style=3D"padding-left:3px;"><br><br>On 9 April 2014 12:27:13 GMT-04:00, =
Tamas Blummer <<a =
href=3D"mailto:tamas@bitsofproof.com">tamas@bitsofproof.com</a>> =
wrote:<br>>A border router that is not able to serve blocks is still =
protecting<br>>consensus rules, that SPVs do not.<br>>If the =
network would only consist of SPV nodes only then e.g. a<br>>majority =
coalition of miner could increase their reward at =
will.<br>><br>>Archives need a different solution.<br><br>Any =
collective group that has a majority of hashing power will have no major =
issues running enough nodes that follow their rules to make SPV insecure =
anyway.<br><br>There's no good reason not to have SPV security nodes =
distribute block chain data, particularly block headers. It helps =
provide redundancy in the network topology and helps provide more =
resources for full nodes to sync up faster. For instance in a network =
with a large number of partial UTXO set nodes if those nodes are =
forwarding block data to each other they can get enough data to become =
fully fledged full nodes without putting all the load on the existing =
full nodes.<span class=3D"Apple-converted-space"> </span> This is a =
good =
thing.</div></fieldset><br><br><br></blockquote></div><br></body></html>=
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