Algorithm 2 Proof-of-Work (PoW) consensus

Input: Candidate block $B$ with transactions Output: Valid block with valid nonce 1: procedure PROOF_OF_WORK($B$) 2:   Nonce ← 0 3:   while TRUE do 4:     HashVal ← H($B$, Nonce) 5:     if HashVal < DifficultyTarget then 6:       return ($B$, Nonce, HashVal)//Valid block found 7:     else 8:       Nonce ← Nonce + 1 9:     end if 10:   end while 11: end procedure