Coinbase will undergo maintenance on August 19th BlockBeats news, on August 14th, according to official sources, Coinbase will undergo maintenance at 8am Beijing time on August 19th. During the maintenance period, there will be delays in the sending and receiving of BTC, LTC, BCH, ZEC, and DASH. All ERC20 tokens, as well as the sending and receiving of Ethereum (ETH) and Ethereum Classic (ETC) networks, will also experience delays, and transactions will not be affected.