
Everyone about to buy bitcoin directly from a stranger for the first time asks the same thing: what if something goes wrong?
On an exchange it's clear enough - there's support, there's a company, there's someone to complain to. In P2P there's no company at all. So who decides?
Let's look at how Bisq handles it. It has been running since 2016, so there's plenty of experience to draw on.
Why It Rarely Comes to a Dispute
Before a trade, both people put up a deposit. Buyer and seller alike. That money sits in an account that opens only with two keys at once - nobody takes it out alone.
After that it's just arithmetic. Drop a trade halfway through or start playing games, and you lose your own money. Not a rating, not a reputation, but a real sum. That's usually enough: finishing honestly works out cheaper.
So disputes are rare. But they happen.
What Happens If You Do End Up in One
Either of the two can open a dispute. A mediator shows up - an ordinary participant in the network, a real person, not a support manager. They have a messenger contact, you write to them directly, and they answer within a set time.
From there they do what anyone in their position would. Ask both sides for explanations and receipts. Hear one out, go to the other, cross-check.
The story is usually a dull one. The seller posted an offer, the buyer took it, the payment didn't go through. The seller says the problem is at your bank, not mine - and immediately runs another trade with a third person, which goes through fine. The buyer says the name on the account didn't match what you gave me, and I wasn't taking the risk.
Both sound plausible. The mediator has to sort it out.
The Key Part: The Mediator Decides Nothing
This is the whole point.
They don't move the money and they don't take it. They propose: this much to one, that much to the other - factoring in who broke the rules. Sometimes with a deduction in favour of the second party. Two percent, say, if the account details really didn't match.
And then both of them sign that proposal. Disagree, and you reject it and say why. Until both signatures are in, the money stays put.
Which means that even in the middle of a dispute, only the two people who made the trade control the funds. Neither the mediator nor the network holds a key.
If they still can't agree, the case goes to arbitration. The limits there are tight too: only the trade amount and one deposit can be split. How the deposits, the two-key account and both stages of the process are built is laid out at https://bisq.info/pro-tools/">https://bisq.info/pro-tools/

What's Inconvenient About It
It isn't fast. A dispute gets up to two weeks, you have to answer on time, and dragging it out costs you.
And you'll need to read the rules beforehand. That seller in the story was sure he'd done everything right - and took a deduction anyway. Because he had formally broken the requirement about the name on the account. The rules there aren't for show, and "I didn't know" won't save you.
In return you get something no exchange offers: nobody can take your money on their own. Not the other participant, not the mediator, not the platform itself.
In Short
No company doesn't mean no rules. It means the rules rest not on somebody's decision, but on how the thing is built. On a deposit you'd hate to lose. And on signatures without which the money doesn't budge.
Slower than exchange support. But it doesn't depend on whether anyone answers you.
The project's documentation is entirely open, dispute procedure included - https://bisq.info/