Blockchain, a wallet app that allows users to send and receive the digital currency Bitcoin, has been removed from the App Store, according to Bloomberg.
Blockchain.info, the developer of the software, received an e-mail from Apple saying that the app was withdrawn "due to an unresolved issue," Nicolas Cary, chief executive officer of the London-based company, said.
Cary told Bloomberg that he didn't understand the timing of the removal of the app, as it has been in the App Store for two years.
Late last year, Apple removed Bitcoin buying and trading platform Coinbase from the App Store and, more recently, Apple required the developers behind Gliph, a secure messaging platform that allowed Bitcoin transfers, to remove the transfer feature in order to keep its app on the App Store.
Blockchain's removal is another chapter in Apple's tumultuous relationship with Bitcoin apps. The company has told developers behind Bitcoin-related apps that they may not include content that "enables, facilitates or encourages an activity" that some countries deem illegal. App Store Review Guidelines require that apps be legal in all locations in which the app is available.