Name Gender Date of birth Nationality Home address How you look Email address Phone number Device ID Transactions and related data Most exchanges worldwide ask for KYC data. The points mentioned above are just some of the personal details that get revealed when exchanges get hacked. You may have bought bitcoin from KYCd exchanges. But each of your bitcoin transaction need not be a threat to your personal data being revealed. Putting your bitcoin through a coinjoin ensures that your bitcoin don’t reaveal your personal information.