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

MwithM notifications at github.com
Thu Nov 12 11:39:37 CET 2020


@crocket 
> If the record says it was delivered, the arbitrator may just send bitcoin to the bitcoin buyer. Also, people use cash-by-mail deals because they want privacy.

People could use CBM because they have found a way to scam other people.

@dscotese 
> The main problem with scammers and CBM is that the scammer gets his victim to send a legitimate seller good money for a sale the scammer will never honor. I make this difficult by requiring the mailpiece to include a note stating the username, platform, and reason for the cash. LBC has no control over whether or not a seller does this, and no way to verify whether or not they do it, and I believe their reputation was suffering because of it, which is why they disallow it now. I believe it has gotten harder to do as most people don't like such scamming and therefore share information about it so that awareness is ever more pervasive, making the scam more difficult.

Just as with Face to Face trades, I find it impossible for moderators and arbitrators to get tamper evidence of what happened during a trade. For example, a dishonest BTC seller could say that real money is counterfeit using a false bill verifier machine or a fake pen: video proof can't verify bills.
I don't think it's bad reputation what stopped Localbitcoins from using these payment methods, very similar platforms appeared the day after Localbitcoins ceased to do so. Reputation works well enough for this, people is used to it, although 100% security is impossible. They stopped this payment methods because of KYC/AML laws.

@chimp1984 
> Another option would be to user 100% security deposit or even higher and make clear that there is no dispute resolution like with F2F tades. But I guess if it gets that expensive nobody will use it anyway.

I think that the only way this payment methods  (face to face, gift cards, cash by mail) can work at Bisq is by [Mutual Assured Destruction](https://bisq.community/t/no-arbitrator-f2f-trades-with-multisig-2of2/7880), which would be really decentralized as there is no arbitration needed. 
The currrent max 50% security deposit can be enough for this, but it should be something that users choose and 100% might be an option. Very little changes, even not at all, need to be done to allow Bisq arbitrationless trades. We just need to acknowledge this possibility and let clear that traders should be willing to donate the security deposit and trading funds if something goes wrong, as that's the only way to protect from scammers.

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