> For the complete documentation index, see [llms.txt](https://tokens-economy.gitbook.io/consensus/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tokens-economy.gitbook.io/consensus/chain-based-pbft-and-bft-based-proof-of-stake.md).

# Chain-based PBFT and BFT-based Proof of Stake

Byzantine Fault Tolerance (BFT) consensus

### Pros

* BFT provide strong finality guarantees in that either all honest nodes will adopt a block or none will (thus eliminating the possibility of forks and rollbacks found in Bitcoin) 

### Cons

* Existing BFT algorithms normally do not scale well.