[bisq-network/bisq] Add option to make trade 'reason' less obvious (#2869)

[Jul3k]

Okay. So lets plot this further and sorry for my criminal intent. When I look at the EUR/BTC SEPA offer book, I see plenty of people that have multiple offers (I know from the same onion address) with the same price (often 0.01 BTC) online over multiple days/weeks/months. I could choose possible victims and perform a trade with them once. I would use the correct name but wrong account number to find out if they complain and thus check if they can see my account number. Or I lookup the bank and check if they show the account number to customers which is even more secure. I would not even have to complete the trade. I could tell that my bank does not allow me to send money to their bank. Mediators will likely recommend to cancel the trade. So a scammer could do all that without much risk to loose his security deposit. A single seller with multiple offers could be used simultaneously, making a revenue >0.05 BTC per scam possible and the whole thing quite profitable.

I would personally fall into that category of seller matching those criteria. Of course I could change my bank, but to be honest they are crypto friendly. Before I felt/was more secure with the trade ID specified. If the trade ID leads to people being banned because their banks see a violation of their terms and can match transactions to the Bisq protocol then maybe the trade ID should be more random in its nature to prevent that. Variable length, sometimes numerical/alphanum, containing dashes, dots, spaces, hashs ... could be used. My 2 cent.

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