> For the complete documentation index, see [llms.txt](https://gabriel-j-shapiro.gitbook.io/metalex-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gabriel-j-shapiro.gitbook.io/metalex-docs/protocol-how-to-guides/restrict-transfers.md).

# Restrict cyberSCRIP transfers

cyberSCRIP is an ERC-20. You can restrict it with transfer-restriction hooks, and a cyberCORP can hold (and later renounce) compliance powers.

## Transfer-restriction hooks

Hooks implement `ITransferRestrictionHook`; CyberScrip runs every installed hook on each transfer. See [Hooks](/metalex-docs/protocol-reference/hooks.md).

Hooks are set initially when the scrip is deployed (`typeRestrictionHooks` argument of `deployCyberScrip`) and can be changed afterward through the IssuanceManager:

```solidity
// at deploy time
address cyberScrip = IIssuanceManager(issuanceManager).deployCyberScrip(
    certAddress,
    typeRestrictionHooks,   // ITransferRestrictionHook[]
    /* ...remaining args... */
);
```

On the `CyberCertPrinter` itself, the IssuanceManager can also set hooks for cyberCERT transfers: `setRestrictionHook(certAddress, id, hook)` and `setGlobalRestrictionHook(certAddress, hook)`.

Implementations in [`src/hooks/transfer/`](https://github.com/MetaLex-Tech/cybercorps-contracts/tree/develop/src/hooks/transfer): `WhitelistTransferHook` (allow only whitelisted addresses) and `ToggleTransferHook` (per-token on/off). Consult each contract's source for its admin functions.

## Compliance powers

A CyberScrip is deployed with three optional powers — the last three booleans of `deployCyberScrip`:

```solidity
    /* ... */ true /*enableForceTransfer*/, true /*enableForceBurn*/, true /*enableFreeze*/
```

There is **no blocklist** — only force transfer, force burn, and freeze.

| Power          | Exercised via (on CyberScrip)     |
| -------------- | --------------------------------- |
| Force transfer | `forceTransfer(from, to, amount)` |
| Force burn     | `forceBurn(account, amount)`      |
| Freeze         | `setFrozen(account, isFrozen)`    |

These functions are `onlyIssuanceManager`, so they are driven through the cyberCORP's IssuanceManager.

## Permanently disabling a power

Each power has a one-way disable on CyberScrip — `disableForceTransfer()`, `disableForceBurn()`, `disableFreeze()`. Once disabled, a power cannot be re-enabled; exercising it afterward reverts `ComplianceFeatureDisabled`. Like the exercise functions, the disables are `onlyIssuanceManager`.

## Holder cap

`CyberScrip.setMaxHolderCount(n)` caps the holder count (`0` = unlimited); transfers that would exceed it revert `HolderLimitExceeded`.

## Related

* [CyberScrip](/metalex-docs/protocol-reference/contracts/cyberscrip.md), [Hooks](/metalex-docs/protocol-reference/hooks.md).


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