How to make the coin collect only once even if the player rejoins the game?

So I am making an obby, I have a coin after every 2-3 stages. Once I collect that specific coin, it adds to my leader board. If I try to collect the coin again, I can't collect it again.

But if I rejoin the game, I can still collect the coins which I collected before. I don't want that to happen. No matter if the player again joins the game or what. It should not be able to collect it twice.

I have this script inside the coin which does not allow the player to collect it twice, but if the player rejoin the game, he can collect it twice.

Script inside the coin:

local db = true
script.Parent.Touched:connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") ~= nil then
        if db == true then
            db = false
            script.Parent.Transparency = 1
            local player = game.Players:GetPlayerFromCharacter(hit.Parent)
            player.leaderstats.Coins.Value = player.leaderstats.Coins.Value + 1
            script.Sound:Play()
            wait(1)
            script.Parent.Transparency = 1
            wait(1)
            script.Parent.Transparency = 0

        end
    end 
end)

Please help me.

Thanks