Under the DAC8 framework and the CARF, crypto platforms collect and transmit more data to tax authorities, making crypto tax assistants almost indispensable for calculating capital gains. However, centralizing this information creates a detailed map of users’ wealth, which can facilitate targeted phishing, kidnappings and the targeting of victims after a data breach. CoinTracking, developed in Germany since 2012 and used by more than 2.2 million active users, offers registration without an email address or phone number, read-only and encrypted API keys, exclusive hosting in Germany under the GDPR, and company-level ISO/IEC 27001 certification. It also provides native two-factor authentication, data exports and immediate, permanent deletion, and applies the method set out in Article 150 VH bis of the French General Tax Code while automatically generating Form 2086. Users should reinforce these protections with a unique password, application-based authentication, dedicated API keys, a separate email address and vigilance against phishing attempts.
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