> For the complete documentation index, see [llms.txt](https://docs.lighter.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lighter.xyz/developers/integration-guides/multi-signature-wallets.md).

# Multi-signature and smart wallets

Smart-contract wallets and multisigs (e.g. Safe) can't produce ECDSA `personal_sign` signatures, so any step that needs your Ethereum private key works differently. Most features are still available:

| Action                    | EOA wallet      | Smart wallet / multisig                            |
| ------------------------- | --------------- | -------------------------------------------------- |
| Deposit                   | ✅               | ✅ (contract call)                                  |
| Register API key          | `personal_sign` | On-chain `changePubKey` (priority transaction)     |
| Trade with API key        | ✅               | ✅                                                  |
| Secure withdrawal         | ✅               | ✅ – the **only** way to withdraw funds off Lighter |
| Transfer to another owner | ✅               | ❌                                                  |
| Fast withdrawal           | ✅               | ❌                                                  |

## Registering an API key

In the front-end, you can still sign in by registering your API key with a priority transaction (i.e. using Ethereum's priority transactions). To do this, make sure to tick the box shown in the authentication modal. Under the hood, you're calling `changePubKey()` via Lighter's mainnet contract.

![](https://1252326453-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FDEieHYipGNMWymYUQkvO%2Fuploads%2Fgit-blob-bb20bdcc9dbaa4b73fe112361c31197c88154f60%2Fimage-c79ea895.png?alt=media)

Through the API:

1. Generate a keypair (`GenerateAPIKey` in the [WASM signer](/developers/reference/wasm-signer.md), or the SDKs).
2. From the multisig, call `changePubKey` on the Lighter contract with the account index, API key index and public key. You can also use the [Ethereum gateway](https://app.lighter.xyz/ethereum-gateway/).
3. Once the priority transaction is processed, the key works like any other.

While you can change public key via priority transactions, you cannot perform a transfer that way. See [Priority Transactions](/developers/reference/priority-transactions.md) for everything you can do directly through the contract.


---

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