Are you sure that Sri Lanka's Bank of Ceylon banned bitcoin? I'm looking for an article that has this news but the results are poor.
This is one of their latest statement: April 16,2018.
Public Awareness on Virtual Currencies in Sri LankaThey are giving warning to their people but there's no ban.
So there's no ban and about this topic, the statement was it was banned but it's not. This topic should be dumped. And look at the date the news was posted, April 16, 2018. All I think it's just a regulation in bitcoin.