I know how to handle events using personalised blockchain using ganache, can anyone tell me how to handle events in Kovan,rinkeby testnets?
fromBlock: 'latest', toBlock: 'latest'
On your Ganache private network, you are the only one who sends transactions.
So the events of your latest transaction will obviously be available to you on the latest block.
On the Kovan public network, there are others who send transactions as well.
So new blocks are added to the chain even when you are not sending anything, and by the time you try to fetch your events, the block which stores them is no longer the latest one in the chain.