What is the Proof of Activity (POA) consensus protocol?

Proof of Activity (PoA) is a hybrid mechanism that combines proof of work (PoW) and proof of stake (PoS). The mining process in POA begins as standard with the participation of all miners who try to get ahead of each other when finding a new block. The miner with the higher computing power wins. When a new block is found, the system switches to PoS. The found block contains only the address of the miner to receive the reward and the header.