Each block in the blockchain contains its hash, along with the hash of the block before it, as well as the time stamp.
For a cryptocurrency transfer processed out successfully, it carries its number of transactions, which serves as proof of the transfer so that your wallet is credited with the corresponding amount.
As long as there is an existing transfer on the blockchain, it is referred to as a unique id number of transactions called hash - this code is a long sequence composed of numbers and digits. This hash contributes to validating and finding any transaction on the blockchain network.