Not exact matches
Examples of such rules are: no more
than 21 million
bitcoins should enter the system; the speed at which a hash is calculated; the reward for miners; the inputs and
outputs of a transaction; and so on.
Because
Bitcoin uses an unspent transaction
output model (UTXO), it means that the
Bitcoin blockchain will maintain records of «spent» and «unspent»
outputs, rather
than the
Bitcoin balance of each user.