Blockchain Public Key & Private Key
Major cryptocurrencies like Bitcoin, Ethereum, and Bitcoin Cash function using three fundamental pieces of information: the address, associated with a balance and used for sending and receiving funds, and the address’ corresponding public and private keys.
When someone sends you cryptocoins over the Blockchain, they are actually sending them to a hashed version of what’s known as the “Public Key”.
There is another key which is hidden from them, that is known as the “Private Key.” The private key is what grants a cryptocurrency user ownership of the funds on a given address and should not be shared with outsiders (that is, unless you want your cryptocurrencies to be stolen!).