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. The concept of mining is used in this type of consensus mechanism.
https://www.writofinance.com/c....onsensus-mechanism-p
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