title: Adding additional data fields to account information in Substrate
body: <p>Very new to Substrate and Rust. My understanding of the ChainState is that it acts sort of like a database which holds account numbers (in this case public keys) and their associated balances. When making a transaction, Substrate basically checks to see that you have a sufficient balance, and if so, the transaction succeeds. (This is different from the UTXO method used in Bitcoin.)</p>
  <p>First of all, if I am wrong on the above, please correct me.</p>
  <p>If I am correct (or at least close) I would like to find a method for associating other data with each account. I've noticed that in the demos, accounts are also associated with names, like Alice, Bob, etc. Is this kept in the ChainState, or is this something which would only be stored on one's own node?</p>
  <p>I am trying to determine a way to associate additional data with accounts in the ChainState. For example, how could I store a name (like Alice, Bob, etc.) in the ChainState (assuming that they are only stored locally) or even other information, such as the birthday of the account owner, or their favorite author, or whatever arbitrary information?</p>