In Dark Souls Remastered what do gold,silver,copper coins do?

[BucketBoiAce]

So I am doing my 10th playthrough of Dark Souls Remastered and I would like to know what  gold,silver,copper coins do because I do not what they do. 

[5x5]

Boost luck (item drop rate)

[BucketBoiAce]

2 minutes ago, 5x5 said:

Boost luck (item drop rate)

Ahhh, thank you very much. 

[5x5]

Just now, BucketBoiAce said:

Ahhh, thank you very much. 

[BucketBoiAce]

Just now, 5x5 said: