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arXiv · 2410.14876

Slipstream: Ebb-and-Flow Consensus on a DAG with Fast Confirmation for UTXO Transactions

Nikita Polyanskii·Sebastian Muller·Mayank Raikwar
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Abstract

This paper introduces Slipstream, a Byzantine Fault Tolerance (BFT) protocol where nodes concurrently propose blocks to be added to a Directed Acyclic Graph (DAG) and aim to agree on block ordering. Slipstream offers two types of block orderings: an optimistic ordering, which is live and secure in a sleepy model under up to 50% Byzantine nodes, and a final ordering, which is a prefix of the optimistic ordering and ensures safety and liveness in an eventual lock-step synchronous model under up to 33% Byzantine nodes. Additionally, Slipstream integrates a payment system that allows for fast UTXO transaction confirmation independently of block ordering. Transactions are confirmed in three rounds during synchrony, and unconfirmed double spends are resolved in a novel way using the DAG structure.

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Nikita Polyanskii, Sebastian Muller, Mayank Raikwar. 2024-10-18. Slipstream: Ebb-and-Flow Consensus on a DAG with Fast Confirmation for UTXO Transactions. https://arxiv.org/abs/2410.14876

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