# CKB Simple UDT ## Metadata **RFC Number**:: 25 **Status**:: #x **Zettel**:: #zettel/fleeting **Source**:: #from/browser **URL**:: [github.com](https://github.com/nervosnetwork/rfcs/blob/master/rfcs/0025-simple-udt/0025-simple-udt.md) **Host**:: [[github.com]] **Created**:: [[2022-10-14]] ## Synopsis This RFC defines the Simple User Defined Tokens(Simple UDT or SUDT) specification. Simple UDT provides a way for dapp developers to issue custom tokens on Nervos CKB. The simple part in Simple UDT means we are defining a minimal standard that contains whats absolutely needed, more sophisticated actions are left to CKBs flexibility to achieve.