Slovenia claims world's first blockchain monumentThe first monument to the blockchain technology that underpins crypto-currencies took center stage on Tuesday on a roundabout in Slovenia, authorities in the country's fourth largest city said. Weighing three tonnes and with a diameter of about seven meters the circular metal sculpture was unveiled next to the courthouse in Kranj, about 30 kilometers (20 miles) north of the capital Ljubljana. The design, featuring the 'B' symbol crossed by two vertical lines that represents both blockchain and the bitcoin currency, was chosen by popular demand.