# Sign function & QR Codes

### What Is QR-Code Signing?

ELLIPAL Titan uses **air-gapped QR-code signing** to keep your private keys offline.

When you send a transaction:

* The **ELLIPAL App** creates the transaction
* The **Titan** reviews and signs it offline
* QR codes are used to transfer transaction data between the App and the Titan
* Your private key always stays on the cold wallet

### How the Signing Process Works

<figure><img src="/files/asPYzy1LnTJ9zy7dGZQu" alt=""><figcaption></figcaption></figure>

Follow the steps below to complete a normal signing process:

1. On the **ELLIPAL App**, review the transaction details and tap **I Understand**
2. On the **ELLIPAL App**, the **Unsigned Data QR Code** will appear
3. On the **Titan**, select the correct network and tap **Sign**
4. On the **Titan**, enter your password and tap **Confirm**
5. On the **Titan**, scan the **Unsigned Data QR Code** shown on the **ELLIPAL App**
6. On the **Titan**, review the transaction details and tap **OK**
7. On the **Titan**, the **Signed Data QR Code** will appear
8. On the **ELLIPAL App**, tap **Scan "Signed Data QR Code"**
9. On the **ELLIPAL App**, scan the **Signed Data QR Code** shown on the **Titan**

After the scan is completed, the **ELLIPAL App** will submit the transaction to the blockchain.

### How to Identify Different QR Codes

#### 1. Connection / Sync QR Code

<figure><img src="/files/2oJqC6X7h2LWhPSHuDR9" alt=""><figcaption></figcaption></figure>

This QR code is used to connect the Titan to the ELLIPAL App or sync account information.

* Used during wallet connection or re-connection
* Not used for transaction signing

#### 2. Unsigned Data QR Code

<figure><img src="/files/ZYDxBkub18obruZ9UWQP" alt=""><figcaption></figcaption></figure>

This QR code contains the transaction data that still needs to be signed.

* Displayed in the **ELLIPAL App**
* Scanned by the **Titan**
* Appears before signing

#### 3. Signed Data QR Code

<figure><img src="/files/AGtpRSEMRQ0WFNesD4MG" alt=""><figcaption></figcaption></figure>

This QR code contains the signed transaction data.

* Displayed on the **Titan**
* Scanned by the **ELLIPAL App**
* Appears after you confirm the transaction on Titan

#### 4. Receiving Address QR Code

<figure><img src="/files/mIaR1babhmKHKY2lbJb2" alt=""><figcaption></figcaption></figure>

This QR code is used to receive funds.

* Shared with the sender
* Represents your wallet address
* Not part of the signing process

{% hint style="warning" %}

### Notes

* During sending, the **Titan scans the Unsigned Data QR Code**
* During sending, the **App scans the Signed Data QR Code**
* A **receiving QR code** is only for receiving funds
* A **connection QR code** is only for wallet connection or sync
* Always verify the transaction details on Titan before confirming
  {% endhint %}

### FAQ

<details>

<summary><strong>Why do I need to scan twice when sending crypto?</strong></summary>

Because the transaction data must go in two directions:

* From the App to the Titan for signing
* From the Titan back to the App for broadcasting

</details>

<details>

<summary><strong>Which QR code should Titan scan?</strong></summary>

Titan should scan the **Unsigned Data QR Code** shown in the App.

</details>

<details>

<summary><strong>Which QR code should the App scan?</strong></summary>

The App should scan the **Signed Data QR Code** shown on Titan.

</details>

<details>

<summary><strong>Is the receiving QR code the same as the signing QR code?</strong></summary>

No. A receiving QR code is only used to receive funds. It is not used for signing.

</details>

<details>

<summary><strong>Is the connection QR code the same as the transaction QR code?</strong></summary>

No. A connection QR code is used to connect or sync the wallet. It is different from the QR codes used during transaction signing.

</details>


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