[z9znz]

1 - I ran a bitcoin node, and I had a script which would poll the node every few seconds to get the status of the addresses which I knew had open orders. Any that had received a payment would get marked accordingly so I could show on the order status page. But I didn't mark the order as paid until there were 2 confs.

2 - I pre-funded each Stellar address before providing it to the buyer. Periodically later if orders never got completed I would sweep the old addresses. But it wasn't much as Stellar was only about $0.2 USD at the time.