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Incentive Strategies for Transaction-Fee Regime of Proof-of-Work Blockchains
Budinský, Rastislav ; Perešíni, Martin (oponent) ; Homoliak, Ivan (vedoucí práce)
In this thesis, we review the undercutting attacks in the transaction-fee-based regime of Proof-of-Work (PoW) blockchains with the longest chain fork-choice rule. Next, we focus on the problem of fluctuations in mining revenue and the mining gap -- i.e., a situation, in which the immediate reward from transaction fees does not cover miners' expenditures. To mitigate these issues, we propose a solution that splits transaction fees from a mined block into two parts -- (1) an instant reward for the miner of a block and (2) a deposit sent to one or more Fee-Redistribution Contracts ($\mathcal{FRC}$s) that are part of the consensus protocol. At the same time, these redistribution contracts reward the miner of a block with a certain fraction of the accumulated funds of the incoming fees over a predefined time. This setting enables us to achieve several interesting properties that are beneficial for the incentive stability and security of the protocol. With our solution, the fraction of \textsc{Default-Compliant} miners who strictly do not execute undercutting attack is lowered from the state-of-the-art result of 66\% to 30\%.

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