Skip to main content
Version: develop

Custodial wallet

Operate your on-chain business without putting your book on display. Run a treasury wallet, an escrow service in a payment flow, or a CEX-style service — and keep your balances and your internal flows private from competitors and on-chain observers.

The problem​

A custodian operating on-chain today leaks the entire business:

  • On a public chain, every deposit, every withdrawal, every rebalance, every customer settlement is on the ledger. Competitors track your AUM and your volume.
  • Existing private on-chain protocols would hide the activity, but at the cost of slow settlement, isolation from the rest of the ecosystem, and integration of infrastructure outside the regulatory perimeter — which pushes legal and compliance risk back onto you.

You should be able to run on-chain without your book being public, and without stepping outside regulation to get there.

What you protect​

Business data that's normally a free read for competitors and counterparties becomes private:

  • Total holdings. Your AUM is not on display.
  • Balances of wallets under your control. Whether you keep custodial accounts for your customers, or keep multiple accounts for different purposes, no one can see their balances.
  • Internal flows. Hot/cold rebalances, intra-treasury movement, cross-customer transfers — encrypted.
  • Daily volume. An important signal of growth and business trajectory.

Fireblocks and Safe compatibility​

The system uses a dual-key design that maps onto how custodians already operate:

  • Signing key controls funds. It can be any standard EVM signer — a Safe multisig, a Fireblocks-managed MPC key, an institutional policy engine, your in-house custody infrastructure. Whatever moves funds today moves them here too, with the same approval workflow and the same controls.
  • Encryption and viewing key controls visibility. It's independent of the signing key, so dashboards, reporting systems, reconciliation pipelines, and internal analytics can read account state without touching signing authority.

You keep the security architecture you already trust for fund control, and grant the rest of the organization the read access it needs to actually operate.

Direct issuance and redemption​

As a business partner of the issuer, you get a direct rail: fiat to ZK stables and back, at 1:1 rate, no fees, directly to your encrypted account.

We are required by MiCA to offer issuance and redemption of our tokens with no exchange rate and no additional fees. Every ZK token issued is backed 1:1 on a safeguarded bank account.

This gives you the ability to on-ramp and off-ramp large amounts of assets, without going through a CEX, without leaking size of your operation, and at no cost.

Compliance posture​

ZK Stables are regulated stablecoins, operated under a MiCA e-money issuer licence. We work with vetted on/off ramp partners with appropriate licences to offer additional features.

You retain the ability to grant view-keys to:

  • Auditors for periodic review.
  • Regulators under whatever supervisory regime applies to you.
  • Customers for their own account — statements, balance proofs, history.