A hash (or the tx ID) is a unique address of your transaction in a blockchain. Mostly, the hash is a combination of digits and lower case (upper in Ripple) letters that represents a proof that money is sent. Whenever you make a payment, you receive a hash displayed in your wallet. It looks like this: Hash should be located in a blockchain. Our support team may ask you to provide a hash. Sometimes it’s required to find your payment and resolve your issues, if any.