> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pinata.cloud/llms.txt
> Use this file to discover all available pages before exploring further.

# add

> `org:files:write`

Add an EIP-712 signature to a CID

<Note>
  For more information about adding signatures to CIDs on IPFS please read the [Signatures Guide](/files/signatures).
</Note>

## Usage

```typescript theme={null}
import { PinataSDK } from "pinata-web3";

const pinata = new PinataSDK({
  pinataJwt: process.env.PINATA_JWT!,
  pinataGateway: "example-gateway.mypinata.cloud",
});

const signature = await pinata.signatures.private.add({
  cid: "QmXGeVy9dVwfuFJmvbzz8y4dYK1TdxXbDGzwbNuyZ5xXSU",
  signature: "0x1b...911b",
  address: "0xB3899AA8E13172E48D44CE411b0c4c2f08730Dc6"
});
```

## Returns

```typescript theme={null}
type SignatureResponse = {
  cid: string;
  signature: string;
};
```

## Parameters

### cid

* Type: `string`

Target CID that you want to add a signature to.

```typescript {2} theme={null}
const signature = await pinata.signatures.private.add({
  cid: "QmXGeVy9dVwfuFJmvbzz8y4dYK1TdxXbDGzwbNuyZ5xXSU",
  signature: "0x1b...911b",
  address: "0xB3899AA8E13172E48D44CE411b0c4c2f08730Dc6"
});
```

### signature

* Type: `0x${string}`

EIP-712 Signature to be assigned to target CID.

```typescript {3} theme={null}
const signature = await pinata.signatures.private.add({
  cid: "QmXGeVy9dVwfuFJmvbzz8y4dYK1TdxXbDGzwbNuyZ5xXSU",
  signature: "0x1b...911b",
  address: "0xB3899AA8E13172E48D44CE411b0c4c2f08730Dc6"
});
```

### address

* Type: `0x${string}`

Wallet address that made the signature

```typescript {4} theme={null}
const signature = await pinata.signatures.private.add({
  cid: "QmXGeVy9dVwfuFJmvbzz8y4dYK1TdxXbDGzwbNuyZ5xXSU",
  signature: "0x1b...911b",
  address: "0xB3899AA8E13172E48D44CE411b0c4c2f08730Dc6"
});
```