Escrow
A man sat on his office desk. He is wearing a blue blazer and a plaid shirt. There is a cup of coffee, a pen, a calculator, a binder notebook, and a tablet on his desk. He is tapping on the tablet that displays four charts in the blue color. 
An escrow agreement contract printed on paper that contains written terms and a place to sign. A black pen appears on the paper.
Two people face each other, one holds a tablet and the other one holds a smartphone. Both display a Blockchain application, simulating a financial transaction.