Re: [bitcoin-dev] Bulletin boards without selective censorability for bitcoin fungibility markets

[yanmaani@cock.li]

On 2020-11-23 12:24, AdamISZ via bitcoin-dev wrote:
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Monday, 23 November 2020 00:40, AdamISZ via bitcoin-dev
> <bitcoin-dev@lists.linuxfoundation.org> wrote:
> 
>> Canvassing opinions/critiques from those working on bitcoin and 
>> related protocols.
>> 
>> See the attached gist for a write-up of an outline of an idea, which 
>> is conceived for joinmarket but can apply in other scenarios where 
>> there is market for liquidity and in which privacy is a very high 
>> priority (hence 'bitcoin fungibility markets' can certainly include 
>> coinswap along with coinjoin, but possibly other things):
>> 
>> https://gist.github.com/AdamISZ/b52704905cdd914ec9dac9fc52b621d6
> 
> Greg Maxwell pointed out to me on IRC that this idea doesn't work:
> there is only a receipt on the commitment to the offer (message) from
> the maker, not on the plaintext version, hence there is nothing
> stopping the maker from falsely claiming censorship after not sending
> the plaintext.
> 
> Reflecting on this a bit more, my intuition is that this problem is
> much more difficult than I had hoped; if there is a solution I suspect
> it involves much more sophisticated ideas. Many solutions just end up
> begging the question by presuming the existence of an uncensorable BB
> in order to create a new one; and/or use the blockchain for that
> function, but that is too slow and expensive, usually. I'd be happy to
> be proved wrong, though :)
> 
> waxwing
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Blockchains are bad for this, because you don't want for it to cost 
money to use your bulletin board. However, the problem was solved more 
than a decade ago. Look into FMS, which combines Usenet/mailing lists 
with a web of trust for spam resistance.