<!--
Sitemap:
- [Welcome to Kakushi 隠し](/index): Kakushi is a private execution layer for institutions building on stablecoin rails.
- [What is Kakushi](/introduction/what-is-kakushi): Money is private.
- [Using Kakushi with AI](/introduction/using-kakushi-with-ai): Every page in these docs is available as plain markdown for use with language models.
- [Quickstart](/quickstart): This is the ten minute path.
- [Zones and the trust model](/concepts/zones-and-trust): A zone is a private blockchain only you can see inside, with a public chain's proofs underneath.
- [The portal](/concepts/the-portal): Money walks in as public USDC and becomes private the moment it crosses.
- [Accounts and custody](/concepts/accounts-and-custody): Your existing wallet address is already a Kakushi account. Nothing to deploy, nothing to enroll.
- [Bring your own address](/concepts/bring-your-own-address): A zone account is just an address, the one an auth key recovers to, with nothing deployed.
- [Virtual addresses](/concepts/virtual-addresses): Hand every customer their own address, the way a bank hands out virtual account numbers.
- [Private transfers](/concepts/private-transfers): Pay fifty thousand people and publish zero salaries.
- [Settlement and composability](/concepts/settlement-and-composability): Two institutions settle in real time without sharing a ledger or seeing each other's books.
- [Private deposits and withdrawals](/concepts/private-deposits-and-withdrawals): Soon, even the edges go dark.
- [Proofs and the verifier](/concepts/proofs-and-the-verifier): You cannot fake a balance, and you can prove you are solvent without showing a single customer.
- [Fees and gas](/concepts/fees-and-gas): Your users never hold ETH and never see gas. They pay in the dollars they are already sending.
- [Privacy and disclosure](/concepts/privacy-and-disclosure): The public sees nothing, you see everything, the regulator sees what the law entitles them to.
- [Zone policies](/concepts/zone-policies): Compliance is built into the zone. You configure your program; the substrate enforces it on every transfer.
- [Onboard a customer](/guides/onboard-a-customer): Two calls and a webhook, and your customer has a private on-chain account.
- [Accept deposits](/guides/accept-deposits): Anyone with funds on the host chain can pay into your zone, and it lands as a private balance for your user.
- [Make private transfers](/guides/private-transfers): One call moves money privately. One call pays a whole payroll.
- [Process withdrawals](/guides/withdrawals): Burn inside, release canonical USDC outside, in one call.
- [Settle between zones](/guides/settle-between-zones): Send money to another institution's zone like it is a withdrawal. It is interbank settlement.
- [Handle webhooks](/guides/webhooks): React to money moving. Do not poll for it.
- [Reconcile](/guides/reconcile): Two numbers that must always match. Assert it on a schedule.
- [Non-custodial integration](/guides/non-custodial-integration): The user signs on their device. You never hold the key, and you still cannot move their money.
- [Compliance and disclosure](/guides/compliance): You hold the whole record. Disclosure is an export, not a negotiation with the protocol.
- [SDK reference](/sdk-reference): The look-it-up layer.
- [Connect and EVM reference](/connect-and-evm-reference): The chain-level integration detail.
- [Run a zone](/run-a-zone): Most operators never run any infrastructure.
- [Protocol spec](/protocol-spec): The deep technical layer, for auditors and engineers integrating below the SDK.
- [Resources](/resources): See Key concepts for the working vocabulary, expanded throughout Core concepts.
-->

# Settle between zones

Sending money to another institution's zone uses the primitive you already know: a withdrawal. The only difference is the destination is a virtual address in their zone. The host chain does the settling in the middle, and neither side sees the other's books.

![Bank A withdraws to a virtual address in Bank B's zone, settled through the host chain](/images/guides/settle-between-zones.svg)

```ts
import { privateKeyToAccount } from "viem/accounts";

// load the key from your own secret store / env; the SDK never sees the raw key
const customerAccount = privateKeyToAccount(process.env.BANK_A_CUSTOMER_PRIVATE_KEY as `0x${string}`);

await kakushi.withdrawals.create({
  to: "0xBankBVirtualAddress",   // a virtual address Bank B issued for its customer
  amount: "10000.00",
  token: "USDC",
  account: customerAccount,      // source is customerAccount.address (the account Bank A holds for this customer)
  idempotencyKey: "interbank_55",
});
```

The recipient is credited inside Bank B's zone with a representation backed by the same canonical asset that just moved on the host chain. Two institutions that compete and trust each other minimally settle in real time, because they settle through neutral public rails instead of a shared ledger.

:::tip
This is the answer to the "cash island" problem that interbank tokenized-deposit efforts run into. You connect the islands through the public chain, with no consortium chain and no shared view of each other's flows.
:::