- Conference Paper
In the context of second layer payments in Bitcoin, andspecifically the Lightning Network, we propose a design fora lightweight watchtower that does not need to store signedjustice transactions. We alter the structure of the openingand commitment transactions in Lightning channels toencode justice transactions as part of the commitmenttransactions. With that, a watchtower just needs to watchfor specific cheating commitment transaction IDs on theblockchain and can extract signed justice transactionsdirectly from these commitment transactions that appear onthe blockchain. Our construction saves an order ofmagnitude in storage over existing watchtower designs. Inaddition, we let the watchtower prove to each channel thatit has access to all the data required to do its job, and cantherefore be paid-per-update. Show more
Book titleAFT '19: Proceedings of the 1st ACM Conference on Advances in Financial Technologies
Pages / Article No.
Subjectbitcoin; payment channels; lightning network; watchtower
Organisational unit03604 - Wattenhofer, Roger / Wattenhofer, Roger
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