Re: [Bitcoin-development] Defeating the block withholding attack

2012-06-04 Thread Luke-Jr
On Tuesday, June 05, 2012 12:00:25 AM Mike Koss wrote: > I don't understand how your proposal will work for decentralized pools - > can you explain it more concretely? > > What would the new block header look like? For example (just a draft; in reality, merged mining would probably be

Re: [Bitcoin-development] Defeating the block withholding attack

2012-06-04 Thread Mike Koss
I don't understand how your proposal will work for decentralized pools - can you explain it more concretely? What would the new block header look like? What is required for a share to to be earned? What is required for a block to be valid (added to Block Chain)? I don't think I understand what

Re: [Bitcoin-development] Defeating the block withholding attack

2012-06-04 Thread Mike Koss
As I understand the attack, the attacker gets compensated for the shares they earn, but the pool will be denied any valid blocks found. The attacker DOES NOT have access to the Bitcoins earned in the unreported block (only the mining pool has access to the Coinbase address and transactions in the

Re: [Bitcoin-development] Defeating the block withholding attack

2012-06-04 Thread Luke-Jr
On Monday, June 04, 2012 8:49:48 PM Mike Koss wrote: > As I understand the attack, the attacker gets compensated for the shares > they earn, but the pool will be denied any valid blocks found. The > attacker DOES NOT have access to the Bitcoins earned in the unreported > block (only the mining poo

Re: [Bitcoin-development] Defeating the block withholding attack

2012-06-03 Thread Luke-Jr
On Monday, June 04, 2012 1:43:42 AM Peter Vessenes wrote: > Does it have asymmetric payoff for an attacker, that is, over time does it > pay them more to spend their hashes attacking than just mining? That depends on the pool's reward scheme. Some complicated forms are capable of getting "bonus"

Re: [Bitcoin-development] Defeating the block withholding attack

2012-06-03 Thread Peter Vessenes
On Sat, Jun 2, 2012 at 8:52 PM, Luke-Jr wrote: > Analysis, comments, constructive criticism, etc welcome for the following: > > ==Background== > At present, an attacker can harm a pool by intentionally NOT submitting > shares > that are also valid blocks. All pools are vulnerable to this attack,

[Bitcoin-development] Defeating the block withholding attack

2012-06-02 Thread Luke-Jr
Analysis, comments, constructive criticism, etc welcome for the following: ==Background== At present, an attacker can harm a pool by intentionally NOT submitting shares that are also valid blocks. All pools are vulnerable to this attack, whether centralized or decentralized and regardless of rew