Good morning darosior, Subject of the email looks interesting and I have few comments on the things shared:
> The part of Revault we are interested in for this study is the delegation > process, and more specifically the application of spending policies by > network monitors (watchtowers). Participants regularly exchange the Cancel > transaction signatures for each deposit, sharing the signatures with the > watchtowers they operate.Watchtowers can enforce spending policies (say, > can't Unvault outside of business hours) by having the Cancel transaction be > confirmed before the expiration of the timelock. What are the privacy issues associated with such watchtowers? > ## 4. We are still betting on future feerate The problem is still missing one more constraint. "Ensuring confirmation at any time" involves ensuring confirmation at *any* feerate, which you *cannot* do. Agree > historical feerate: We currently use the maximum of the 95th percentiles over > 90-days windows over historical block chain feerates. Disagree that fee rates used in past should matter. > Apart from judging that 500sat/vb is probably more reasonable than > 10sat/vbyte, this unfortunately sounds pretty much crystal-ball-driven. Agree > ## 7. Bumping and re-bumping First of all, when to fee-bump? At fixed time intervals? At each block connection? It sounds like, given a large enough timelock, you could try to greed by "trying your luck" at a lower feerate and only re-bumping every N blocks. You would then start aggressively bumping at every block after M blocks have passed. Agree > You probably want to base your estimates on `estimatesmartfee` Disagree. `estimatesmartfee` RPC has few issues: https://github.com/bitcoin/bitcoin/pull/22722#issuecomment-901907447 > ## 9. Insurances there is definitely room for an insurance market. Agree. I think its possible using discreet log contracts with some trust assumptions and use of multi oracles. I had one idea about creating insurance project for LGBTQ community in India as they don't have enough options like others. Have shared the details here: https://gist.github.com/prayank23/f30ab1ab68bffe6bcb2ceacec599cd36 As final point, I guess you already know about this presentation by Jack Mallers in which he has described how we could create derivatives for users to hedge fees: https://youtu.be/rBCG0btUlTw -- Prayank A3B1 E430 2298 178F
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