Coin Age

Coin age refers to the age of txn inputs. Coin age is equal to the number of coins sent times the average age on these coins. Age is measured in days. Age is reset to zero whenever a coin is sent AND whenever a coin provides a signature. Coin age could be used to calculate mandatory fees, block reward or proofhash target.

Novacoin uses consumed coin age for Proof-of-Stake block rewards calculation.