Proof-of-activity (PoA) represents a blockchain consensus methodology encompassing elements from both proof-of-work (PoW) and proof-of-stake (PoS). The primary objective of this mechanism is to counteract potential vulnerabilities that may arise within the Bitcoin blockchain once the final bitcoin is mined and the compensation for block creation ceases. At this juncture, the incentive for maintaining the blockchain will rest solely on user-provided transaction fees. Should the allure of cryptocurrency mining wane, participation levels and hash rates would also diminish, leaving the system open to potential exploitation.