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How to Securely Prune Bitcoin's Blockchain

: Matzutt, R.; Kalde, B.; Pennekamp, J.; Drichel, A.; Henze, M.; Wehrle, K.

International Federation for Information Processing -IFIP-; Institute of Electrical and Electronics Engineers -IEEE-:
IFIP Networking Conference and Workshops, Networking 2020 : June 22-25, 2020 - Paris, France
Piscataway, NJ: IEEE, 2020
ISBN: 978-3-903176-28-7
ISBN: 978-1-7281-6710-7 (Print on Demand (Curran))
Networking Conference <2020, Online>
Conference Paper
Fraunhofer FKIE ()

Bitcoin was the first successful decentralized cryptocurrency and remains the most popular of its kind to this day. Despite the benefits of its blockchain, Bitcoin still faces serious scalability issues, most importantly its ever-increasing blockchain size. While alternative designs introduced schemes to periodically create snapshots and thereafter prune older blocks, already-deployed systems such as Bitcoin are often considered incapable of adopting corresponding approaches. In this work, we revise this popular belief and present CoinPrune, a snapshot-based pruning scheme that is fully compatible with Bitcoin. CoinPrune can be deployed through an opt-in velvet fork, i.e., without impeding the established Bitcoin network. By requiring miners to publicly announce and jointly reaffirm recent snapshots on the blockchain, CoinPrune establishes trust into the snapshots' correctness even in the presence of powerful adversaries. Our evaluation shows that CoinPrune reduces the storage requirements of Bitcoin already by two orders of magnitude today, with further relative savings as the blockchain grows. In our experiments, nodes only have to fetch and process 5GiB instead of 230GiB of data when joining the network, reducing the synchronization time on powerful devices from currently 5h to 46min, with even more savings for less powerful devices.