I donate to multiple charities through Givewell, and I allow them to release my contact info, which means the charities know who I am. But I believe they have a

I donate to multiple charities through Givewell, and I allow them to release my contact info, which means the charities know who I am. But I believe they have an option to hide your contact info so that you're donating anonymously to the charities. So in that case, only Givewell will have your contact info.