Quote from: Spacy on November 10, 2011, 10:25:41 PM

Quote from: DeathAndTaxes on November 10, 2011, 05:23:56 AM

A seller accepting 0-confirm sales is vulnerable to a Finney attack but given the staggering amount of hashing power required to even attempt that nobody is going to spend $80,000 to build a hashing farm to double spend a 1BTC copy of angry birds.

No, but they will transfer hundreds of thousands of LTC into exchanges, sell it and withdraw, then rewrite the chain. But true, it's not worth for small business amounts to wait hours for lot of confirmations.

Right which is why no exchange allows you to withdraw until you have 1 (possibly more) confirmations.

Really the only transactions which are vulnerable to Finney attack are
a) very large in value
b) irrevocable and instantaneous.
c) doesn't require 1 confirmation.

I don't know of any transaction like that which exists. A business just need to evaluate their risks.