[dlc-dev] Selling oracle signature via bitcoin on-chain payment

[桑原一郎]

Hey Nadav,

Thank you for your comment.

>I think what you've laid out is generally right and was essentially what
we implemented on the April 2020 hackday here (though we weren't using
signature points, but this would only have been a couple extra steps to
compute them): https://youtu.be/w9o4v7Idjno
Yes, what I mentioned is mostly the content of this video! (I missed it!)

>it is strictly much much worse for privacy on-chain as you must reveal a
UTXO you own whereas in LN no such thing must happen, and all other
communication in both cases can happen over TOR or twitter or any other way
in which the oracle does not learn anything about the user.
I agree, revealing UTXO is much much worse, and again on-chain fees are too
high, especially when using for numerical decomposition DLC.

>Furthermore, as such I think I would personally prefer using HTLCs on the
lightning network as is today to sell these signatures, using something
like LSAT or PAID APIs. I generally don't think the truthfulness is a real
issue because you already trust the oracle but if users do want to mitigate
this trust, simply ask the oracle to publish the hash of the signature
along with a relatively simple ZKP (such as a bulletproof) showing that the
hash corresponds to the signature (or more likely the signature point).
>This amount of work to standardize this simple ZKP is likely equivalent in
magnitude to building a client and bootstrapping networking for on-chain
PTLC clients, and it has all the advantages with essentially no
disadvantages as far as I can tell.
Seems to be interesting, I would like to know more about the idea of using
this simple ZKP. Do you post about it somewhere? Or do you know good
reference to learn it?

Best,
Ichiro


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