The QuarkChain mainnet will be upgraded on September 27th at 12:00:00 AM GMT-07:00 DST. This upgrade aims to support smart contract and PoSW mining on the root chain. Please be sure to upgrade your cluster to avoid wasting mining power. For the corresponding docker info, please refer to: github.com/QuarkChain/pyquarkchain/releases/tag/mainnet1.3.0. Due to the upgrade of the mainnet, all the exchanges may suspend the deposit service during this period. The specific information is subject to the announcement of each exchange. Please be cautious to large amount of transactions during the upgrade time.