Local script affecting other players?

I have a script that is supposed to make certain bricks appear for the player when they touch a brick, it works fine except for the fact that other players can also see it when they're not supposed to.

This is my code:

local CrashBlocks = game.Workspace.crash:GetChildren()

local function onTouch(hit)
    for i, v in pairs(CrashBlocks)do
        v.Transparency = 0
        v.CanCollide = true
    end
    end
game.Workspace.speed1.Touched:Connect(onTouch)


local debounce = false

local sound = game.Workspace.soundeffects.Explosion

game.Workspace.speed1.Touched:Connect(function(hit)

    if not debounce then

        debounce = true

        sound:Play()

        wait(3)

        debounce = false
    end
end)

My understanding of local scripts is that they will only appear on the players client, apologies if I'm missing something super obvious here, I'm really new.