Soulmarks are for the account but unless they've changed in the past few years, they are tied to a specific server (and there is a web-based database which notes the server but lets you search for them all). Since the web database is more comprehensive and doesn't require a GM to log into the game to access, it's preferred by Sony. Also, the (in-game) soulmarks are limited to 10 per account per server, the 11th bumps the 1st away. Their web interface doesn't have that limitation.
The in-client code to view and set soulmarks is there but it requires the server to cooperate, and the server requires you to have a GM flag with an avatar level of at least Guide. Guides and Senior Guides don't have a special client (though it was rumored that Elder Guides, who have no avatar level of their own so are given the lowest GM level -- GM-Staff?) were given a special client. I'm dubious about that being true because of Sony's security requirements. If it is true, in recent years there were no more than 5 or 6 Elder Guides, so who knows.
Again - two year old info for me, I don't know how much of it is still accurate today. More info than ya wanted, I'm sure
