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So basically I want to do what observers do but with command blocks and from anywhere in the world.
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To test if a specific block has changed, you could clone the block and surrounding area to a fixed location, then use "/execute if blocks" the next tick to compare the saved version to the location's current state. (You put the test BEFORE the clone in the chain). The reason why you clone all the blocks around it (3x3 cube) is so any connections like fences it has will stay the same.
For this to work, the block being tested and the command block both need to be loaded. You might need to force-load one or the other.
For this to work, the block being tested and the command block both need to be loaded. You might need to force-load one or the other.
I simply want to check if a bell is rung, is it possible to do this?
Do you want to check weither any bell is rung, or a specific bell? If it is any bell, a simple scoreboard should work (minecraft.custom:minecraft.bell_ring). If it is a specific bell then you would probably need to do raycasting to check the direction that the player is looking, which could miss etc, and I would personally not advice.
I'm pretty sure it is possible, I've seen it before on bedrock, but I don't know how to do it.
