Re: [Bitcoin-development] Bitcoin difficulty sanity check suggestion

2013-12-24 Thread Matt Corallo
An attacker with some small hashpower isolates you (as an individual) from the network by MITMing your network. You just switch the the attackers chain as if nothing happened because of the network rule that defines it as OK. Today, you will see that you're behind and warn the user. Was it really

[Bitcoin-development] Peer Discovery and Overlay

2013-12-24 Thread Jeremy Spilman
Some really nice efforts out there to map and analyze the bitcoin P2P network. The current protocol apparently recommends returning up to 2500 addresses from 'getaddr'. I'm not sure how much clients are expected to probe the address space in order to select 'far-apart' peers, or how much

Re: [Bitcoin-development] Peer Discovery and Overlay

2013-12-24 Thread Tier Nolan
On Tue, Dec 24, 2013 at 8:52 AM, Jeremy Spilman jer...@taplink.co wrote: Are there any past instances of applications hijacking or interfacing with the exiting p2p messages, or abusing 'getaddr' functionality? Are there any guidelines on this, or should there be? There was a BIP by Stefan

Re: [Bitcoin-development] Peer Discovery and Overlay

2013-12-24 Thread Peter Todd
On Tue, Dec 24, 2013 at 12:52:46AM -0800, Jeremy Spilman wrote: Some really nice efforts out there to map and analyze the bitcoin P2P network. The current protocol apparently recommends returning up to 2500 addresses from 'getaddr'. I'm not sure how much clients are expected to probe

Re: [Bitcoin-development] Peer Discovery and Overlay

2013-12-24 Thread Warren Togami Jr.
I was concerned about this issue so we sponsored BlueMatt to implement an address database for bitcoinj. In the future it won't be entirely reliant on what DNS tells it. Warren On Tue, Dec 24, 2013 at 6:02 AM, Peter Todd p...@petertodd.org wrote: As for node addresses being a service, that's

Re: [Bitcoin-development] Peer Discovery and Overlay

2013-12-24 Thread Mike Hearn
Thanks Warren! That's great. It's also a prerequisite for chain pruning, so it's not only about decentralisation but also scalability. Looking forward to reviewing and merging that. On Tue, Dec 24, 2013 at 6:11 PM, Warren Togami Jr. wtog...@gmail.comwrote: I was concerned about this issue so

Re: [Bitcoin-development] Bitcoin-development Digest, Vol 31, Issue 41

2013-12-24 Thread Ryan Carboni
You just completely ignored my point. I'm not sure who's trying to insult whom, or if you're attempting an argumentum ad hominem. My idea is completely valid. The only way to man in the middle to have such a large percentage of hash power is to either a) attack a pool (which people would notice