Might i ask why you wish to remain anonymous? For a regulated broker im afraid that is the norm, id and proof of address will be part of a KYC (know your customer). Id assume its for the prevention of money laundering or similar, and is something iv never questioned really as the origin of my funding is and will allways be obtained in a legit and legal fashion (expendable cash from a salary (taxes paid etc etc). If its of such importance to you then you may have to look towards offshore or unregulated brokers. And needless to say this should exercise caution from your behalf, I have used several and still use a couple to this day that iv never had any issues with, but my needs to use are not to the grounds of anonymity, I wanted higher leverage,and particularly for crypto, and overall trading conditions that are of greater benefit to me, be that lower spreads, lower trading fees, or more freedom to move larger balances at speed ( a necessity for me when cryptocurrency is as it is). My only advice when it comes to any broker, regulated or unregulated, don't rush into anything. Do your research, plenty of reviews on this forum, and you'll find if any issues have arisen and been published here, more often than not you'll see the broker can be invited to address the complaint and work through it transparently. Some don't respond which will brings the simple fact of, Reputation goes a long way!