Quote from: deepceleron on October 23, 2014, 06:46:49 AM

The hash that comes out of a strong hashing algorithm has a random distribution. Although it is less likely, it doesn't take any more work to find a 000000000000000001.. hash than it does a 0000ffff.. hash, only luck.

The blockchain requires each block to meet the proof of work. To replace ten past blocks, you would have to generate ten blocks of your own. This is a much higher bar than a single lucky hash being able to replace ten blocks.

With a more-difficult-hash chain instantly winning like proposed, it would be an orphan free-for-all, you could get one lucky hash attempting to build on blocks from a week ago and replace tons of transactions. As described, a miner could attack for free by

1. constantly be transferring a large balance between new addresses in every block they mine,
2. find a "lucky" hash much smaller than the average and withhold it, and
3. make all sorts of purchases that will be wiped when they publish the chain-erasing block find that sends the money back to the miner.

OP already annoyed everyone with his great ideas based on a poor understanding of mining here: https://bitcointalk.org/index.php?topic=823544.msg9204175#msg9204175

I am a honest miner and lets say i mine on level n.
I receive a new valid block (A) at level n+1 so i switch mining on top of this new block.
Due to network delay few seconds later i receive another valid block (B) for lever n+1.
At that particular moment part of the network is mining on top of (A) and the rest on top of (B)

So if our decision (which block to mine on?) is based solely on block's arrival time part of the network would be mining on the 'wrong' block.

Is there a way to make nodes agree an what is the most appropriate block to mine on top of it?
For example the hash of each block could be used to make all nodes of the network agree and choose either (A) or (B)

Do we want a solution in this idiomatic case or we leave it just in luck?

PS. How reference Bitcoin Core client behaves in the above case?