What is the mark of the beast (Antichrist)?

when the antichrist takes control of the world during the tribulation, he will enforce everyone to take his mark(mark of the beast) , it will be put on people's hands or foreheads, once taken, you have no chance at heaven anymore, you have sealed your fate to hell. if you don't take it, you will be forced to live in hiding, because you will be beheaded if you refuse, and without it you will not be able to buy or sell, that means you can't buy food or the things needed to survive on. i would rather just lose my head than take the mark and suffer an eternity, lose your head and go straight to heaven is much better, but i wont have to worry about it, because i'm saved by the blood of jesus christ and he will take me out of this world before any of this takes place. the bible warns to know how to count because the mark will equal 666. no one knows for sure what it will be exactly, but it will have something to do with these numbers, and it's most likely a chip implanted into your skin, that way they can keep track of everything you do. that is already possible today, people are using microchips more and more. praise god for his grace!!!! god bless.