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If there is this kind of problem for instance where the owner of the property decides to claim that they did not receive any money in bitcoin, and the case is taken to a law court, what do you think the outcome of the case will be? If proofs of payment are provided but in cryptocurrency, do you think the court will consider it even though transactions are tagged illegal with it? or will the case be thrown out and the owner of the property with the false claim of not receiving the money be allowed to go freely?
This is why it's good to obey the law of the land so that the law can fight injustice for you when you need it.
But first, Bitcoin transactions are always transparent and can be checked by anyone anywhere if the access to the website/app is not blocked. However, this case is different and technical at the same time and could end up in two ways.
Way 1, the judge might entirely disregard the case since it's a cryptocurrency transaction and it's already banned in the land. Way 2, the judge might decide to get justice for the victim and treat cryptocurrency as property if the victim could pay for all the needed verification means and claims he did use it in the country.
This is allowed and judges act on the case and not its extension but can only recommend additional investigation of the victim. The court may then hire a forensic verification outside the country to know the truth about the matter. The report is what the court would act upon, this will not flout the law of the land but treat the case.