How To Add Mobile Number in Blockchain Account | Blockchain Wallet | Crypto Ustaad. Blockchain is an online cryptocurrency wallet in which user can send, receive and trade different type of digital currencies. The online application allows its users to create or edit account information, buy bitcoin using the different payment method, send or receive bitcoin and ether and exchange your cryptocurrency with money. We have recently received some requests from our website readers that they would like to delete their account from the Blockchain Application. After doing some research on this topic that why users are deleting their account from blockchain application we came to the conclusion that some users are not using the application for quite a long time which is why they would like to delete their account.