[bisq-network/bisq] Add "Cash by mail" as a payment option (#1101)

[chimp1984]

@dave2014btc 
Thanks for your inputs!
As others mentioned already Bisq does not has a centralized reputation system as that would not work with protection of privacy. As the main security tool on other platfroms is that reputation and as you stated thats a main motivation to not scam as you want to be in the game for longer time we need other protection.
Do you think that a high security deposit (15% is min. anyway for all methods) will be accepted by your trade peers? Discussed amounts are 50-100% deposit for both sides which gets refunded once trade is completed. The deposit is in the 2of2 multisig, no trusted third party. So full control by the 2 traders. But that opens also a new risk of blackmail. There is always one trader who has more to lose at a certain point in the protocol. The one who has less to lose could then blackmail the other. For smaller amounts and for high deposits that risk become lower but it cannot be eliminated.

Regarding privacy/physical security:
Are most users using their home address? If so a market maker would collect a lot of sensible and security relevant data. E.g. if you have collected 100s or 1000s of addresses of BTC holders and you get hacked your computer the hacker know where BTC holders life. Just imagine BTC goes to 100k - that will be a very real risk exposure to those traders to get robbed at their home.
Are people on other platforms not concerned about that? Or do they use mailboxes instead of home addresses? 
Another risk is that regulators (market makers acting as high volume pro traders might easily become a target of regulatory requirements) capture such a market maker and confiscate that data and know immediately a large chunk of the BTC holders. Atm of course its not illegal to hold/trade BTC but times can change and some ugly tendencies are on the way to become law in the EU (enforcement to register all your btc addresses). Or just unclear tax situation where the citizen is guilty by default and need to proof that he is innocent (as it is the default tax authority attitute in Spain or Italy). That could be used very easily for criminalisation of BTC holders at any time and having honeypots where they get a large chunk of user data is a serious risk.

Regarding video/proof:
My main concern is not fake video which is indeed hard to do. But the process of puting in the money until handing over to the delivery company would need to be filmed without any cut and that is not feasible. Same for receiver, to get a real proof it would require a video showing the point of receipt from delivery company until unpacking and counting.
And then there is the case with fake money. If high quality fake it is likely hard to detect for non professionals with more advanced equipment. And its basically impossible to proof on video. So buyer could always claim he got problems later when using the cash at a bank and there is no possible proof for that.
All that ends up that the mediators cannot make a judegement in real disputes as they lack of a solid proof. They still can help with smaller problems not related to scam attempts, but the security of all other payment methods in Bisq (excl. F2F) is based on the fact that there are ways to get a solid proof so scammers will not even try is as they know they would lose.


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