A requirement to define an expensive computer calculation, also called mining, that needs to be performed in order to create a new group of trustless transactions (blocks) on the distributed ledger or blockchain is referred to as proof of work (PoS).
A blockchain can be defined as a digital and dynamic financial system framework that is designed and developed for recording and maintaining transactions that are associated with or made through the use of a bitcoin, usually as a database.
In Computer technology, proof of work (PoS) can be defined as a requirement that ensures that expensive computer calculation (mining) which are to be performed are well defined, so as to help end users create a new set of trustless transactions on a blockchain or distributed ledger.
In conclusion, proof of work (PoS) helps to enforce transparency and data integrity on a blockchain or distributed ledger.
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