The encoded addresses of the accounts which should be used to sign message (base-64 for
mobile applications and base-58 for desktop browsers - use the adapter's encodeAccount
method to encode Accounts for the current platform). These
should be a subset of the addresses returned by authorize or reauthorize for the current
session’s authorization.
The encoded messages to sign (base-64 URL for mobile applications and utf-8 for desktop
browsers - use the adapter's encodeMessage method to encode messages for the current
platform).