Today is a sad day for those of us who use bitcoin and value our privacy. Just today, a law came into force in Spain that obliges entities that provide crypto-related services in the country to report absolutely all transactions carried out during the year.
This is a direct attack not only on our privacy but also on cryptocurrency users, as no other tax legislation has gone this far.
This is why it is advised not to use a centralized system to purchase or sell Bitcoin; instead, a P2P system is greatly encouraged. Since the law has ordered all crypto transaction data to be submitted, except for people who have used a centralized system to carry out their Bitcoin transactions, those who used a P2P system cannot be tracked. You can only see the transaction taking place in their Bitcoin wallet and also see the Bitcoin in the owner's wallet, but you cannot trace the user. So I feel sorry for those who used a centralized platform to purchase Bitcoin; they can be easily identified through their KYC details or log-in IP if the Spanish government wants to know the identity of individuals through the corporation of those entities that provide crypto related service.
KYC is an attached to Bitcoin; it's always said in this forum.