A blockchain is an electronic ledger (database), which operates independently of a central authority, and is controlled by a network of computers around the world. When a transaction is submitted to the network, it is first verified, and then recorded onto the ledger.
As soon as anything is recorded in this ledger, it is permanently recorded and cannot be altered or modified. The records are shared across all the computers on the network, making it difficult to hack or tamper with.
The first cryptocurrency blockchain to be invented and pave the way was Bitcoin, which followed in the footsteps of the cypherpunk movement, drawing inspiration from crypto projects such as “hashcash” and “b-money”, and Surety. Bitcoin was followed by many others including Litecoin, Dogecoin, and Ethereum, which is the primary blockchain for the GameStop Wallet.