Nicehash isn't a multipool. They don't mine anything. They sell hashpower which in turn is pointed to any pool of your choosing.
If you're selling
They provide a market to sell your hashing power to others who in turn mine at whichever pool they desire.
no i'm mining with my rigs there they have a multipool that mine alts and pays you in bitcoin ....
Nicehash don't mine any coin here.
They just list all the miner and someone buy x Mh and redirect this hashrate to a pool of theyr choice.
You as a miner, you provide your hashrate and tell i have xx Mh/s available, Use it to the best paying algo / buyer and the btc used by the buyer is shared to the miner.
so i'm actually not mining ? but renting my rigs ? but i thought i was actually mining alts there and nicehash is exchanging the alts i mined for btc and paying it to my wallet like wafflepool for example ...