Effective date: April 07, 2019
Grin is a cryptocurrency which puts privacy of the user at the first place, transaction amounts, senders and recipients are all cryptographically obscured. However at the moment in order to make the technology work on a mobile phone compromises have to be made. So in Grin Vault all of the personal data resides on your mobile device, but you need to connect to an external service in order to query the blockchain for information about a transaction, or to propagate transactions to the network.
The app connects to our servers in order to provide such functions, but it does not require any registration and only discloses to the server the minimum amout of data necessary.