add note to diagram.
/// | [invalid record]
/// [data record]
///
+/// ** note: The Invalid Record is invalid because it is not a direct descendant of the Init Tx.
+///
/// Data can be added to the chain via a `DataTransaction`. The `DataTransaction` is associated to the chain
/// through the owner's ID and it contains its own randomly generated ID. As with every other record, a
/// `DataTransaction` contains a Counter which allows the Vault to identify which record is the latest in the
/// associated record for deletion. The record is deleted when the chain preforms a garbage collection and the
/// `RevocationTransaction` is deleted along with it.
///
-///
use thiserror::Error as DeriveError;
mod base64;
