This glitch works just about any server and any mode on it. Please read carefully. My brother first discovered this glitch and we were like amazed. So pretty much it's a good way to harvest at least 2~3 Platinum Coins depending on how much room you got in your inventory.

1. Place two Active Blocks on any surface.
2. Place any kind of Chest (Chest, Golden or Shadow) on the Active Blocks,
3. Put an item in the Chest (recommended to deposit useless item, like a Dirt Block)
4. Place a switch or button beside the Active Blocks.
5. Wire the switch/button to the Active Blocks.
6. Trigger the switch/button and you'll get 3~5 chests everytime you right-click it.

You can get about an entire inventory full stack of these. One stack is worth 9 Gold 90 Silver, and that is a lot! You can have about 30 Stacks of these if you emptied out your entire inventory, or 40 if you emptied everything (which isn't really recommended as there are Wraiths at night). I hope you find this method is useful to you if you give it a try at least. :3