[bisq-network/bisq] Investigations for a new trade protocol (#5430)

[Cointastical]

> micro payent channels is mentioned in my overview and Coinffeine was a project implementing it, 

My apologies for skimming that part.  I think I saw the word DEX and I think my eyes glossed over.

Looks like my innovative idea is about 8 years too late to be considered novel. :-)

> not many payment providers which offer API access so that the app can do automated transfers and which are very cheap/free. 

Ya, I am probably over-optimistic presuming there would be open access to the API for a CBDC (versus closed API access, just for authorized third parties).

> the problem was that the payment provider would spot those micro transactions and the users lose their privacy and the payment provider could easily disallow that type of usage. 

If there was API access (and thus ability for automation), then the $100 trade could occur instantly, with 10 different counterparties (as sellers could have bots/apps/nodes (?) running, just waiting for a trade), or to otherwise disguise, the buyer's bot/app could add randomness in both the timing and amounts, to do chunks of various amounts and spread those out over a period of time (e.g., within 48 hours).  I think of fiat wallets being candidates for this.  Such as Chipper Cash app, a popular payments app in over a half dozen + countries in Africa plus the UK, which offers an [API (for business accounts)](https://chippercash.com/api) and generally has been bitcoin-friendly (though who knows if that will change now that Bezos owns a good chunk of it).

Then again, these fiat wallet / payment apps like Venmo, Chipper Cash seem to be all adding bitcoin natively anyway, so this may be a short-lived use case anyway. 

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