Hello,
How could see total network hashrate for a coin? Presume there is no pool and just exist a qt-wallet with some nodes.
getnetworkhashps ( blocks height )
Returns the estimated network hashes per second based on the last n blocks.
Pass in [blocks] to override # of blocks, -1 specifies since last difficulty change.
Pass in [height] to estimate the network speed at the time when a certain block was found.