Two-round finality refers to a property of certain consensus protocols where transactions are confirmed and become irreversible after only two communication rounds among network participants. This rapid finality significantly reduces the time it takes for transactions to be considered settled and secure. It offers a strong guarantee of transaction permanence with minimal latency. This characteristic is highly desirable for payment systems and applications requiring swift confirmation.
Context
Achieving fast transaction finality is a key objective for many modern blockchain designs, especially those targeting high-throughput payment systems and decentralized exchanges. Protocols aiming for two-round finality often utilize variations of Byzantine Fault Tolerant (BFT) consensus algorithms. Discussions involve the trade-offs between achieving such rapid finality and maintaining decentralization and censorship resistance. Future advancements in consensus research are expected to further optimize protocols to deliver fast, secure, and reliable transaction finality across various blockchain networks.
This leaderless, asynchronous BFT protocol uses concurrent transaction processing and a novel threshold signature to achieve optimal two-round finality and linear communication.
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