Ok here we go …
[1.] User A have X amount of Crypto in wallet and wants to sell
[2.] User B wants to buy, so User clicks on Buy and trade gets locked for a certain period say 30 mins or 1 hr window
[3.] User B deposits funds to User A’s account and marks paid for trade
[4.] User A marks payment accepted and crypto funds get released to User B
if
either of the party does not mark the payment accepted or paid crypto funds stays locked till it’s reconciled by the site
Even while sleeping i have been thinking best way outs 😀