Thank you :D
I use Blockstack to allow users to create an identity which is handled on the Bitcoin blockchain.
Essentially when Blockstack IDs are created for users during registration, they are saved to the Bitcoin blockchain immutably so that the user him or herself is the only one who can control their ID using their private key. This is the way in which user independence is secured so that neither app developers or Blockstack controls their identities.
Take a look to the whitepaper [1] to go deeply in the details.
I use Gaia storage [2] to store data.