Registration
A little changes on registration process …
URL
join/username-or-userhash/auth-id
returns
{address: privateness-address-to-send-coin-hours} or ERROR
URL
joined/username-or-userhash/auth-id
returns
{joined: true-or-false} or ERROR
The user is “joined” (registered) if there are at least one transaction on user’s address “privateness-address-to-send-coin-hours”.
Userhash is also more secure than username.