Validators and miners can be considered to be similar. If a block was changed, it will be evident to version of the process. Abstract Bitcoin, introduced inby which Bitcoin addressed the double spend problem.
It is similar to Proof of Elapsed Time PoET , which encodes the passage of time itself cryptographically to achieve consensus without expending many resources. While pinpointing an exact date is impossible, it is estimated that all 21 million bitcoins will be mined by the year Currently, around 19 million bitcoins have been mined and are in circulation, leaving approximately 2 million left to be mined. This can cause some miners to stop mining, especially those with outdated equipment that is not efficient enough to mine profitably. The reward will continue to be halved until it eventually reaches zero, at which point no more new bitcoins can be created.
