With AirDrop camp. Can i use Btc after sign ?
Of course you can, like in any fork of BTC, snapshot - delivery of new forked coins - use as you wish
There's no fork dude. The snapshot and the btc address signature is a way of proving you had a btc balance at height #480000 so you can get SEM. It's a form of distribution of Semux which is a brand new crypto currency.