Referral system at the chain level

original idea: https://peakd.com/hive-173737/@ash/do-you-think-this-referral-program-idea-could-work-for-hive#@howo/re-ash-qa4d55

problem: it's hard to enforce such a system across all front ends solution: at account creation, set a new field "referral" and this will auto set benefs whenever the account creates content.

Details to be discussed, buyout, expiration date, sum etc, lots of ideas to play around on.