In countries where cryptocurrency transactions are banned using bitcoins is risky. If problem arises court decision is unclear. Proving payment with cryptocurrency does not guarantee success as court might reject it due to its illegality. Courts aim for fairness considering individual circumstances and local laws. Outcome could go other way  favoring buyer or dismissing case or requiring further investigation. Court must balance law and justice making predictions difficult. Additionally property owner false claims may still result in consequences.

You should never enter into a Bitcoin transaction agreement with any party in a country that does not accept Bitcoin, i.e. where it would be considered a criminal offence.
If you want to do a business deal with a party, you must do the transaction in the local currency of that country, otherwise, if the transaction is done through Bitcoin, and if a party denies the transaction, then both parties will be punished in the legal trouble.

I expect that the outcome of the trial will vary from country to country depending on the laws and the judge's legal view of the issue. This is a difficult legal controversy.

For me, I expect that if the country bans cryptocurrencies, proof of payment in cryptocurrency will not be accepted because first, it is not recognized and second, because he violated the law by using cryptocurrencies.

Or there may be another option that the judge will accept proof of payment in cryptocurrency but punish the buyer because he violated the law by using cryptocurrencies.

You should never enter into a Bitcoin transaction agreement with any party in a country that does not accept Bitcoin, i.e. where it would be considered a criminal offence.
If you want to do a business deal with a party, you must do the transaction in the local currency of that country, otherwise, if the transaction is done through Bitcoin, and if a party denies the transaction, then both parties will be punished in the legal trouble.

Yes, that's right. Indeed, as good citizens we must obey the rules in the country where we are or the country we visit. Although bitcoin transactions are carried out with the consent of both parties, if the country prohibits transactions with bitcoin, it is better not to do it. because this is the same as a drug transaction, both parties agree but the country prohibits it, then it will be a criminal act and can be arrested. It would be wiser for us to use legal local currency for transactions.

In my country there was an incident of a transaction using crypto and both parties were eventually arrested. sometimes there are people like this who make the crypto world bad, as if crypto is a crime so that it is hated by the country that has banned it as a means of transaction. So it is wise to use crypto properly.

This is a case that happened in my country.
https://www.cnnindonesia.com/nasional/20230530135954-12-955787/polda-bali-tangkap-pengelola-rental-mobil-layani-transaksi-kripto

The answer to this question will depend on how the law prohibiting bitcoin is written. But in general, in cases where the government declares bitcoin illegal, they will punish the person who used bitcoin to buy the house and they will also punish the person who accepted bitcoin as a means of payment for the house they were selling. And the government will seize the bitcoin and the house will also be seized if the person who received the bitcoins used the bitcoin. For example, if each house cost 9 bitcoins and the person did not use the 9 bitcoins, then the government will only seize the 9 bitcoins and will not seize the house.

Here we were talking about the issue of purchase-sale documents. but I want to add here that when people are getting involved in shady transactions, they don't use this method, they accept to be transferred the bitcoin and then make a document in which they are donating the house, in this case the person who paid in bitcoin appears to be just a beneficiary of the donation of the house and the government doesn't know that the house was paid for in bitcoin

In countries where cryptocurrency transactions are banned using bitcoins is risky. If problem arises court decision is unclear. Proving payment with cryptocurrency does not guarantee success as court might reject it due to its illegality. Courts aim for fairness considering individual circumstances and local laws. Outcome could go other way  favoring buyer or dismissing case or requiring further investigation. Court must balance law and justice making predictions difficult. Additionally property owner false claims may still result in consequences.