# Specter 2/2 PSBT Multi-Sig Keystone firmware versions V1.1.1 (BTC-Only) or newer support PSBT Multi-signature functions. Detailed instructions below will explain how to create a 2-out-of-2 PSBT Multi-signature wallet with the Keystone Wallet and Coldcard as 2 participant co-signers. We will use here Specter V1.4.6 as the watch-only coordinator. 2/2 PSBT Multi-sig is not a good quorum. This tutorial is just for the purpose of showing how to use Keystone and Coldcard to set up your multi-sig wallet with Specter. Learn more about picking a good quorum: ## I. **Preparation** 1\. [Firmware](https://keyst.one/firmware?locale=en) version V1.1.1(BTC-Only) or newer running on Keystone Essential or Pro. Create recovery phrase A. (Please read[ How to upgrade firmware](https://support.keyst.one/getting-started/firmware-upgrading) for more details.) 2\. Coldcard upgraded to firmware version V2.1.0 or later. Create recovery phrase B. 3\. Specter (V1.4.6 or later) installed and running on PC/Mac. 4\. MicroSD card (≤512GB; Default FAT32 format). {% content-ref url="../../../getting-started/firmware-upgrading/how-to-format-a-microsd-card-to-fat32" %} [how-to-format-a-microsd-card-to-fat32](https://support.keyst.one/getting-started/firmware-upgrading/how-to-format-a-microsd-card-to-fat32) {% endcontent-ref %} ## **II. Add device on Specter** {% hint style="info" %} **Tip**: If you want to switch to \[Test Net], please go to Keystone > \[Settings] > \[Blockchain] > \[Test Net]. Then continue with the following steps. {% endhint %} ### 1. Add Keystone on Specter 1\) Click \[+ Add new device] > Select your device type \[Keystone] and enter the name.

2\) You can add Keystone on Specter by QR code or microSD card. #### - By QR code 1\) Keystone > \[Menu] > \[Multisig Wallet] > press \[•••] icon on the top right > \[Show/ Export XPUB].

2\) Specter > click \[Scan QR Code], then scan the QR code show on Keystone.

#### - By microSD card 1\) Insert the microSD card into Keystone > \[Menu] > \[Multisig Wallet] > \[Show/ Export XPUB] > \[Export All] > \[Export].

2\) Take out the microSD card from Keystone and insert it into a PC/Mac. 3\) On Specter: Click on \[Upload from SD Card], then select and open the .json file exported from Keystone.

3\. Click \[Continue], then add Keystone successfully.

### 2. Add Coldcard on Specter 1\) Click \[+ Add new device] on specter. Select your device type \[ColdCard] and enter the name.

2\) Insert microSD card into ColdCard > \[Settings] > \[Multisig Wallets] > \[Export XPUB] > Get xpubs from Coldcard.

3\) Take out the microSD card from Coldcard and insert it into a PC/Mac. 4\) On Specter: Click on \[Upload from SD Card] > Select and open the .json file exported from Coldcard.

5\) Click \[Continue], then add Coldcard successfully.

## **III. Create watch-only wallet for 2/2 PSBT multisig wallet on Specter** 1\. On Specter: Click \[Create Multisignature wallet]. Pick the devices \[ColdCard], \[Keystone] and click \[Continue].

2\. Set the name, Type the number of needed signatures. Click \[Create wallet].

3\. Create a watch-only wallet for 2/2 PSBT multisig wallet successfully.

## **IV. Create a 2/2 PSBT multisig wallet on Coldcard** 1\. Insert the microSD card into Coldcard with a .json file exported from Keystone in the card. 2\. \[Settings] > \[Multisig Wallets] > \[Create Airgapped].

3\. Set address type (Default-P2WSH) and the number of cosigners (2 of 2).

4\. Confirm (√) and complete creating a 2/2 multisig wallet.

5\. You will get a file named “export-CC-2-of-2.txt” on your microSD card after the previous step. You will need it to import multisig wallet to Keystone.

**Tips：**If you didn’t get the file, please export manually by following instructions: 1\. Insert the microSD card into Coldcard. 2\. \[Settings]> \[Multisig Wallets] > \[2/2: CC-2-of-2] > \[Coldcard Export] > \[Coldcard Export] > Export-CC-2-of-2.txt.

## **V. Import 2/2 PSBT multisig wallet to** Keystone 1\. Insert the microSD card into Keystone with the “export-CC-2-of-2.txt” file exported from Coldcard in the card. 2\. \[Menu] > \[Multisig Wallet] > \[Import Multisig Wallet].

3\. Select file “export-CC-2-of-2.txt” > \[Understood] > Check the wallet Info and touch \[Confirm].

## **VI. Receiving bitcoin to the 2/2 multisig address** 1\. On Keystone: Touch \[Addresses] to display the receiving addresses.

2\. On Specter: Select your Multisig Wallet > Click on \[Receive] to display the receiving address.

## **VII. Sending a 2/2 PSBT multisig transaction** ### 1. Create an unsigned transaction on Specter 1\) On Specter: Select your Multisig Wallet > Click on \[Send] > Input the recipient address and amount > \[Create unsigned transaction].

### 2. Sign with Keystone {% hint style="info" %} **Tips:** You can choose to sign the transaction on Keystone via QR code or File. {% endhint %} #### - Option 1: Via QR code 1\) On Specter: Click on \[Keystone] > \[Sign with QR codes] > Specter displays the unsigned transaction data in a QR code format.

2\) On Keystone: Press the \[Scan] icon > Scan the QR code shown on Specter interface > \[Sign] > Password verification. The device will then show the signed transaction data in QR code format.

3\) On Specter: Click on \[Scan signed transaction] > scan the QR code shown on Keystone > Keystone signed successfully

{% hint style="info" %} **Tips:** If you have difficulty on QR code scanning, please tap the QR code to adjust the density of the QR code and retry. {% endhint %}

#### - By File 1\) On Specter: Click on \[Keystone] > \[Sign with SD Card file] > \[save transaction to file] > \[Save] (save the unsigned transaction file to microSD card).

2\) Take out the microSD card from PC/Mac and insert it into your Keystone. 3\) On Keystone: Press the \[microSD card] icon > Select and open the unsigned transaction file > \[Sign] > Password verification > Press \[touch here...] to export partially signed transaction file to microSD card.

4\) Take out the microSD card from your Keystone and insert it into PC/Mac. 5\) On Specter: Click on \[Upload signed transaction] > Select and open the partially signed transaction file exported from Keystone > Keystone signed successfully.

### 3. Sign with Coldcard 1\) Insert the microSD card into PC/Mac. 2\) On Specter: Click on \[ColdCard] > \[Sign with SD card file] > \[save transaction to file] > \[Save] (save the unsigned transaction file to microSD card).

2\) Pull out the microSD card from PC/Mac and insert it into your Coldcard. 3\) On Coldcard: \[Ready To Sign] > \[OK] > export partially signed transaction file to microSD card.

4\) Pull out the microSD card from your Coldcard and insert it into PC/Mac. 5\) On Specter: Click on \[Load signed transaction] > Select and open the partially signed transaction file exported from Coldcard > Coldcard signed successfully.

### 4. Broadcast transaction on Specter 1\) You can choose to broadcast the multisig transaction immediately or later.

Instructions recommended: {% content-ref url="specter-2-3-multi-sig" %} [specter-2-3-multi-sig](https://support.keyst.one/3rd-party-wallets/bitcoin-wallets/specter/specter-2-3-multi-sig) {% endcontent-ref %} {% content-ref url="../../../advanced-features/multi-signature/delete-multisig-wallet" %} [delete-multisig-wallet](https://support.keyst.one/advanced-features/multi-signature/delete-multisig-wallet) {% endcontent-ref %}