Governments either. Definition of a Blockchain: A blockchain is a decentralized digital ledger which records transactions across many computers. No matter who they are. Or cell phones and Satellite TV for that matter. Buying cryptocurrencies like Bitcoin, Etherium, Altcoin, Dodgecoin, etc. In real terms, it means that no one can ever gain access to your financial assets, money or personal data — or have any way of controlling it.