The odds of you being able to double spend cash, and then create sufficient blocks afterward to make a sequence long sufficient to be acknowledged as reliable aren’t great. And, when you have sufficient computing power to tilt those odds in your favor, it’d probably be extra profitable to just mine legitimate blocks as a substitute. How the block is mined depends on the mannequin that the blockchain operates on, which we’ll get into in a bit. After a mining node has created a block, it’ll broadcast it out to the world. The other nodes will check to ensure it’s a legitimate block, then add it to their own ledgers.