Not knowing anything at all about what you're doing I'm sure my suggestions are extremely good :) But at 10 characters I'd use local storage and instead of havi

Not knowing anything at all about what you're doing I'm sure my suggestions are extremely good :) But at 10 characters I'd use local storage and instead of having any sort of account system or such, if it needs to be shared you could just use a link with the string as a query parameter.