5 ms·
I imagine we'll have digital cash eventually, but the only sound non-blockchain solution I know of requires local quantum computation: https://eprint.iacr.org/2
by Laaas 4y ago
I imagine we'll have digital cash eventually, but the only sound non-blockchain solution I know of requires local quantum computation: https://eprint.iacr.org/2020/107 https://eprint.iacr.org/2020/107
- tzs 4y agoWhat do you mean by “sound”? Why doesn’t David Chaum’s eCash from 1982 [1] qualify? That’s an on-line system. In 1990 he, Fiat, and Nairobi proposed an off-line system [2]. [1] http://www.hit.bme.hu/~buttyan/courses/BMEVIHIM219/2009/Chaum.BlindSigForPayment.1982.PDF http://www.hit.bme.hu/~buttyan/courses/BMEVIHIM219/2009/Chau... [2] http://blog.koehntopp.de/uploads/chaum_fiat_naor_ecash.pdf http://blog.koehntopp.de/uploads/chaum_fiat_naor_ecash.pdf
- Laaas 4y agoThe latter works fine if you're OK with completely trusting the banks. Local quantum computation gives you provably sound, decentralised, unprintable digital cash. Nice paper though, I wonder if you can make it quantum resistant.