Creating a coin splash but facing problem with collisions

Firstly, can you edit your original post so it’s formatted nicely like NeilB133 suggested: Using code tags properly

What do you mean by it destroys the original? In your coin script, you have the line Destroy(this.gameObject). That line will destroy the object the script is attached to. If you’re instantiating coins in the game, each coin instance will destroy itself with that line.