C. Proof of Work …
Proof of work (PoW) is a form of cryptographic zero-knowledge proof in which one party (the prover) proves to others (the verifiers) that a certain amount of computational effort has been expended for some purpose….
There are two classes of proof-of-work protocols :
- Challenge–response...
- Solution–verification...
In Proof of Work, other nodes verify the validity of the block by checking that the hash of the data of the block is less than a preset number….