The exact mechanics of the mark are uncertain but the result is certain. It could be as simple as a pin #, an ATM card or an RFID but I am certain a cashless society will soon become prevalent in much of the world and it will try and over rule the worship of God and replace it with the worship of money which is the root of all evil. Most of the pieces exist now except that Christians are in the devil's way. Many believe that God is actively in control of the world. I do not. I believe God is actively in control of Christian's that have decided to ask him into our lives and the Devil is more in control of the worldly events Our choices are simple. Trust God or perish.
While I am not saying that its seems like we are not heading towards a cashless society. We have survived them before. The bible does not say that or hint. I am saying the mark (not a sign as a wonder ) represents natural unconverted man using Cain as a teaching tool. This is in respect to the buying and selling as it relates to the gospel, spiritual truth .
The mark is more like as mark my word; I will perform that which is appointed to the creation or as said in Philippians 2. It is the Spirit of Christ who works in us, with us to both will and do his good pleasure. Again, Mark my word if I say he will not be murdered as he murdered his brother Abel I will finish, end of mark.
And Cain said unto the Lord,
My punishment is greater than I can bear. Behold, thou hast driven me out this day from the face of the earth; and from thy face shall I be hid; and I shall be a fugitive and a vagabond in the earth; and it shall come to pass,
that every one that findeth me shall slay me. And the Lord said unto him,
Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold. And the Lord set a mark upon Cain, lest any finding him should kill him.Genesis 4:13-15
And the Lord set the mark or authority of His word upon Cain, That He would kill them that tried to interfere .Perhaps he did? Its the principle.
666 the mark of a restless wanderer (no sabbath rest) no softening of the heart. The Stony restless heart of natural man remains dead as granite.
Job 23: 9-16 gives us a companion to Philippians 2 :12-13 defining our imputed righteousness hid in Christ One of my favorite parables that hide the work of the gospel. .
On the left hand, where he doth work, but I cannot
behold him: he
hideth himself on the right hand, that I
cannot see him: But he knoweth the way that I take: when he hath tried me, I shall come forth as gold. My foot hath held his steps, his way have I kept, and not declined. Neither have I gone back from the commandment of his lips; I have esteemed the
words of his mouth more than my necessary food. But he is in
one mind, and
who can turn him? and what
his soul desireth, even that he doeth. For
he performeth the thing that is appointed for me: and many such things are with him. Therefore am I troubled at his presence: when I consider, I am afraid of him.
For God maketh my heart soft, and the Almighty troubleth me:Job 23: 9-16