#bitcoin-wizards on 2021-02-11 — irc logs at freenode.irclog.whitequark.org

2021-01-19 16:49 andytoshi changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | This channel is logged. | For logs and more information, visit https://bitcoin.ninja

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20:30 <nkohen> I am trying to devise a special kind of Discreet Log Contract oracle which can attest to an index being below (or above) a certain threshold at a given time. My idea was to have a chain of scalars x_1 -> x_2 -> x_3 -> ... computed from x_1 using a one-way function where x_i will correspond to the event "index is below i*100" or something like this so that if x_i is broadcast by the oracle, x_j can be derived for any j >= i. The tricky

20:30 <nkohen> part is that the one-way function must have the property that there is some other function which allows me to compute all points x_1*G, x_2*G, ... from just a single point (x_1*G) (the points must be known to correspond to the scalars in order to construct DLCs using this oracle). Originally I thought I might be able to use BIP 32 but then I saw that hardened derivation doesn't work for deriving child public keys and non-hardened is

20:30 <nkohen> not one-way (seeing as the parent public keys are known publicly). Does anyone have any suggestions or reasons why this idea will not be practical?

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