arXiv:1805.03870cs.DC
Scaling Nakamoto Consensus to Thousands of Transactions per Second
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Abstract
This paper presents Conflux, a fast, scalable and decentralized blockchain system that optimistically process concurrent blocks without discarding any as forks. The Conflux consensus protocol represents relationships between blocks as a direct acyclic graph and achieves consensus on a total order of the blocks. Conflux then, from the block order, deterministically derives a transaction total order as the blockchain ledger. We evaluated Conflux on Amazon EC2 clusters with up to 20k full nodes. Conflux achieves a transaction throughput of 5.76GB/h while confirming transactions in 4.5-7.4 minutes. The throughput is equivalent to 6400 transactions per second for typical Bitcoin transactions. Our results also indicate that when running Conflux, the consensus protocol is no longer the throughput bottleneck. The bottleneck is instead at the processing capability of individual nodes.
That's still 2 orders of magnitude off: to reach something akin to Visa/Mastercard (tens of thousand tx/s) with a single-chain and a 10-min block target spacing, you'd need a block-size of tens of GB! Good luck finding people willing to run a full-node for zero compensation in…
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