Ethereum's in-progress status arguably occurred earlier this month, when the world's second largest blockchain by investment saw record-high transaction activity thanks in part to a single popular initial coin offering (ICO). The sale, which saw users compete to purchase a new token for an application called Status, ended up affecting the entire network, now valued at more than $28bn, causing it to run more slowly for all users.
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http://www.coindesk.com/28-billion-challenge-can-ethereum-scale-meet-demand/