These are completely fraudulent, or counterfeit, Blockshares. And not very convincing counterfeits at that. They contain none of the properties of Blockshares except that they have the label "BKS". You can't mint with them. You can't vote with them. They are not even remotely connected to the B&C Exchange network. And you can't sell them at any exchange trading Blockshares. So don't buy them.

This is a scam.