Donated 46 coins to purchase a character, they are "locked"

Hello, I have donated yesterday to purchase a character from a friend of mine in the guild. But they are "locked" as far as I know, I didn't "trade" for the coins or sold gold for them, they are donated coins but they got locked. Can anyone explain me this reason?

72 hours safety lock. All you need to do is wait. IIRC the coins are locked from trade section and gifting use, while regular store use should be unhindered.