Is it possible for the issuer to control the maximum balance of (individual) trustors?


Haven't tried by myself, but it looks like you will be able to control the maximum amount with AUTHORIZATION REQUIRED flag. If you set this flag on the issuing account, each trustline requires your approval with ALLOW TRUST operation. You can approve only those trustlines that match the specific criteria (check the limit parameter in your case).

It should work in theory, however, I'm not sure if a user can change the trust limit on the already authorized trustline.

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  • Yes we tried that and it seems that the user can change the trust limit afterwards.. – bonen Mar 6 '18 at 16:50
  • Pity, I can't think of any other way to implement your case. – Orbit Lens Mar 6 '18 at 16:54
  • That's a pity indeed, maybe we'll proceed then by monitoring trustlines for 'limit raising events' and freeze accounts that hit the upper limit – bonen Mar 6 '18 at 16:59

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