Matt Corallo [ARCHIVE] on Nostr: 📅 Original date posted:2013-11-06 📝 Original message:No, the transactions ...
📅 Original date posted:2013-11-06
📝 Original message:No, the transactions relayed are piped through a bitcoind first (ie
fully verified by a bitcoind). For blocks, for which the timing needs to
be tighter, bitcoinj does SPV-validation. Though it is possible to
create a block which passes SPV validation but causes a DoS score, doing
so would cost a miner a full block's worth of profits, which they are
fairly unlikely to do. In any case, if it every becomes a problem, its
not hard to adapt addnode to allow higher DoS scores for individual nodes.
Matt
On 11/06/13 07:25, Tier Nolan wrote:
>
>
>
> On Wed, Nov 6, 2013 at 5:50 AM, Matt Corallo <bitcoin-list at bluematt.me
> <mailto:bitcoin-list at bluematt.me>> wrote:
>
> Relay node details:
> * The relay nodes do some data verification to prevent DoS, but in
> order to keep relay fast, they do not fully verify the data they are
> relaying, thus YOU SHOULD NEVER mine a block building on top of a
> relayed block without fully checking it with your own bitcoin validator
> (as you would any other block relayed from the P2P network).
>
>
> Wouldn't this cause disconnects due to misbehavior?
>
> A standard node connecting to a relay node would receive
> blocks/transactions that are not valid in some way and then disconnect.
>
> Have you looked though the official client to find what things are
> considered signs that a peer is hostile? I assume things like double
> spending checks count as misbehavior and can't be quickly checked by a
> relay node.
>
> Maybe another bit could be assigned in the services field as "relay".
> This means that the node doesn't do any checking.
>
> Connects to relay nodes could be command line/config file only. Peers
> wouldn't connect to them.
📝 Original message:No, the transactions relayed are piped through a bitcoind first (ie
fully verified by a bitcoind). For blocks, for which the timing needs to
be tighter, bitcoinj does SPV-validation. Though it is possible to
create a block which passes SPV validation but causes a DoS score, doing
so would cost a miner a full block's worth of profits, which they are
fairly unlikely to do. In any case, if it every becomes a problem, its
not hard to adapt addnode to allow higher DoS scores for individual nodes.
Matt
On 11/06/13 07:25, Tier Nolan wrote:
>
>
>
> On Wed, Nov 6, 2013 at 5:50 AM, Matt Corallo <bitcoin-list at bluematt.me
> <mailto:bitcoin-list at bluematt.me>> wrote:
>
> Relay node details:
> * The relay nodes do some data verification to prevent DoS, but in
> order to keep relay fast, they do not fully verify the data they are
> relaying, thus YOU SHOULD NEVER mine a block building on top of a
> relayed block without fully checking it with your own bitcoin validator
> (as you would any other block relayed from the P2P network).
>
>
> Wouldn't this cause disconnects due to misbehavior?
>
> A standard node connecting to a relay node would receive
> blocks/transactions that are not valid in some way and then disconnect.
>
> Have you looked though the official client to find what things are
> considered signs that a peer is hostile? I assume things like double
> spending checks count as misbehavior and can't be quickly checked by a
> relay node.
>
> Maybe another bit could be assigned in the services field as "relay".
> This means that the node doesn't do any checking.
>
> Connects to relay nodes could be command line/config file only. Peers
> wouldn't connect to them.