# Gavin Andresen
# 2012-01-16 21:20:32
# https://bitcointalk.org/index.php?topic=58450.msg695618#msg695618

@s{quotedtext}
@s{quotedtext}
 @p{brk}
No, that's not a realistic attack. @p{par}

For an attacker to feed you a malicious block chain, they would have to be able to produce malicious blocks that have CORRECT proof-of-work. I don't think it is realistic to think that any attacker would throw lots of hash power onto a malicious block chain just so they can feed a bad block chain to somebody who connects to them. @p{par}

Especially since that somebody would discover that their version of the block chain was incorrect within about 10 minutes, as soon as they got a new block message. @p{par}

The bugfix was a "belt and suspenders" change to limit the potential damage from somebody who already had more than 50% of hashing power. @p{brk}