'Combating VAT Fraud in Digital Supplied Services in B2C Cross-Border Situations with Blockchain Technology': VAT evasion has received little attention in digital supplied services in B2C cross-border situations so far. To date, tax authorities have not been able to provide suitable investigation methods for checking declared transactions and uncovering unknown taxable circumstances. The ultima ratio to be discussed is payment blocking via the Blockchain Technology. In a digitalized world and in the face of cross-border transactions, it is important to ensure successful enforcement of the law.