In a blog post on Sept. 15, Coinbase said it increased the number of network confirmations required for processing deposits and moved our ZEC trading markets into a limit-only mode to reduce the impact of any volatility.
Block distribution in Zcash | Source: MiningPoolStats
According to data from MiningPoolStats, ViaBTC is now controlling 53% of the Zcash hashing power, while unknown entities control 18.3% and AntPool — 12.2%. Coinbase says it has reached out to Electric Coin Company (ECC), the team behind Zcash, and ViaBTC to reduce the risks of an attack against the network.
It is viewed as a mortal threat to the concept of decentralization. To launch a 51% attack, a person must control most of a network’s mining power and use that power to alter recorded transactions. However, large cryptocurrencies like Bitcoin (BTC) are incredibly difficult to attack because of the resources and hardware it would take.
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