Proof of Staked Authority (PoSA) is a combination of Delegated Proof-of-Stake (DPoS) and Proof-of-Authority (PoA) consensus mechanisms.
Binance Smart Chain (BSC) relies on Proof-of-Staked Authority.
DPoS is a staking model where interested parties put up a stake, or some amount of the network’s native token, in hopes of becoming a “validator”, who validate transactions and create blocks.
The number of validators in a DPoS network is voted on by all token holders.
P0A refers to the picking of validators by a central authority.
In the case of Binance Smart Chain (BSC), that central authority is Binance.
The exchange does the work of making sure the interested validators are worthy of the position before any token holders are able to vote.
The combination of DPoS and PoA helps to create a network with ultra-fast network throughput.
BSC has a block time of 3 seconds, compared to Ethereum’s 10-19 seconds block time and Bitcoin’s 10 minutes block time.