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The Superlinearity Problem in Post-Quantum Blockchains
Oct. 24, 2022, 3:06 p.m. |
IACR News www.iacr.org
ePrint Report: The Superlinearity Problem in Post-Quantum Blockchains
Sunoo Park, Nicholas Spooner
The proof of work mechanism by which many blockchain-based protocols achieve consensus may be undermined by the use of quantum computing in mining—even when all cryptographic primitives are replaced with post-quantum secure alternatives. First, we offer an impossibility result: we prove that quantum (Grover) speedups in solving a large, natural class of proof-of-work puzzles cause an inevitable incentive incompatibility in mining, by distorting the reward structure of mining …
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