how does  nostr:npub1uq70uqgas9pyhds2zt57kr9se8rg3s68ztphjnq82ts8rzeknmeql7u0c2 impose a wallet size limit? is this a limit on the wallet client that it does not accept more ecash?  nostr:npub1nc0ynppqh37rtulr57xjqpzmfjp58xrd4ey8896ehn9j5flg33fszrz5pa