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[–] KurtB 0 points 3 points (+3|-0) ago 

Substantially.

the size of the city is the Blockchain and the height of its walls is the network's hashrate. "As such, the larger the Blockchain, the more hashpower is required to maintain the same level of security,"

http://www.econotimes.com/Nick-Szabo-Rapid-block-size-increase-a-Huge-Security-Risk-77728