Transaction within digital banking or in credit card is controlled by a central authority like bank. They play role as validator, and confirm transactions. This role is analogous to consensus mechanism used in blockchain technology where there is no central authority. Transactions are validated and confirmed by using consensus algorithms. First consensus algorithm (Proof of Work) was established by Satoshi Nakamoto.
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Consensus Mechanism - Proof of Work and Proof of Stake
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Consensus Mechanism - Proof of Work and Proof of Stake

Consensus Mechanism is an algorithm used to achieve agreement, trust and security. Proof of Work and Proof of Stake is widely used in blockchain.