In 19th-century German orthography, "Thaler" became standard, changed to "Taler" in the 1902 spelling reform. The coins were called "joachimsthaler", which became shortened in common usage to "thaler" or "taler". It is named after the medieval currency of thaler (taler). A Pfund (500 g) of silver was equivalent to 52.5 guilder or 30 taler. In April 1681 it was sold for 60.000 Taler to the Elector Frederick of Brandenburg. In March 1599 Emperor Rudolph II bought books from Carl Widemann for 500 Taler. Taler (TLR) is a cryptocurrency launched in Belarus in September 2018. He became a composition student of Tania Taler at age 9. From the German Confederation he received a one-time payment of 2,500 "Taler". An implementation is provided by Taler Systems SA. He bought No. 70 Wilhelmstrasse for 122,500 Taler in 1867. His salary as an assistant was only 120 taler. She was sold to the English firm Dorset and Blythe for 56,000 taler. In 2017 a cryptocurrency named Taler was launched in Belarus as a legal payment instrument. The 3 Mark coin, at 15 g silver, was colloquially called "Taler".