World currency, the English name is worldcoin, referred to as WDC, it was officially released by foreign engineers on May 14, 2013. The coin was first published on the Bitcoin forum, based on the scrypt algorithm, with a total of 265,420,800 coins. WDC is a fast-confirmed electronic currency that generates a block every 30 seconds, and only needs 2 confirmations to be fully credited. The output of WDC early blocks is 64 (each block contains 64 WDC), but this number will decrease by 1% every week or so. Currently, the output of each block of WDC has decreased until April 2021 To about 3.8 or so WDC per block.