Pool wallet
I don't know why, but I am not able to setup pool wallet and / rewardRecipients.
Money are sent every time to random wallet without any sense. 

            // Address to where block rewards are given (pool wallet)
            "address": "1GTkfNkkg9dg5rUGgevSjy6t9BaAxxxxxxx",
            // Block rewards go to the configured pool wallet address to later be paid out
            // to miners, except for a percentage that can go to, for examples,
            // pool operator(s) as pool fees or or to donations address. Addresses or hashed
            // public keys can be used. Here is an example of rewards going to the main pool
            // "op"
            "rewardRecipients": [
                {
                    // Pool wallet
                    "address": "1NphKu9PUGnyyM3ax9pu9LwgGTTpxxxxxxx",
                    "percentage": 0.5
                }
            ],