What is AptosBFT?

Key Features

• Byzantine Fault Tolerance: AptosBFT can safely continue operation even if up to one-third of validator nodes are malicious or faulty. This is a core property of BFT systems, which provide strong safety and liveness guarantees in distributed environments2.
• Based on Jolteon: AptosBFT is based on the "Jolteon" protocol, which itself is an improvement upon the widely used HotStuff BFT protocol. The latest version, AptosBFTv4, reduces commit and confirmation latency by 33%, enhancing transaction throughput and efficiency34.
• Pipelined and Parallelized: AptosBFT uses a pipelined approach, where different stages of the consensus process (choosing transactions, execution, storage, certification) are executed in parallel or independently, optimizing resource usage and increasing throughput35.
• Optimistically Responsive: The protocol adjusts to network conditions, allowing it to maintain low latency for transaction confirmation and high throughput, taking maximum advantage of network capabilities35.
• Leader Selection by Reputation: Leader (block proposer) selection is weighted not only by the size of their stake, but also by their performance (i.e., how reliably and efficiently they propose and vote on blocks). This helps mitigate latency that could be caused by underperforming leaders4.
• Continuous Evolution: AptosBFT has gone through several iterations and upgrades, each improving its speed, safety, and decentralization. The current protocol is AptosBFTv4, and the team is exploring future upgrades to even more advanced consensus models such as DAG-based protocols46.

Role in the Network

• Achieve high transaction throughput and low confirmation times.
• Resist attempts by malicious actors to corrupt or fork the blockchain, as long as less than a third of validators are compromised.
• Support rapid development and upgrades by cleanly separating critical functions and enabling effective auditing35.

Summary Table