Deutsche Post - Speicherstadt Hamburg. The fourth edition of the crypto stamp beautifully complements the digital collecting world and expands the series with an additional highlight of “historical buildings in Germany”. The new crypto stamp features an AI-generated depiction of the ‘water castle’, the most famous landmark of the "Speicherstadt Hamburg," which is regarded as the largest contiguous, uniformly designed warehouse complex in the world. Construction began in 1885 on the Elbe islands of Kehrwieder and Wandrahm and was completed in 1927. In 2015, the ensemble "Speicherstadt and Kontorhausviertel with Chilehaus" was added to the UNESCO World Heritage List and is under monument protection. The crypto stamp innovatively combines the ever-motivating physical stamp with its digital twin (NFT). The NFT is available in five colors and different rarity levels: Pink 2%, Blue 10%, Purple 25%, and Yellow 63%.