MicroSD Card Related
Background#
On the left side of the COLDCARD® is a MicroSD card slot. When needed, the COLDCARD will access the files on that card as a means to interact with the rest of the world without using the USB port.
Many features requiring a MicroSD card are listed in the MicroSD Card
menu, under the Advanced Menu:
MicroSD Functions#
Detailed information and instructions are linked in the function description.
Verify Backup
- Performs a CRC32 check on your backup file.
Backup System
- Encrypts everything you need to regain access to your funds (wallet seed and settings) as a 7z archive and saves it to your MicroSD card.
Dump Summary
- Saves a text file containing a summary of the public details of your wallet. Includes the extended public key (XPUB) for importing to a software wallet.
Export Wallet
- Use this option to create data files for various wallets. Allows you to import data while keeping your COLDCARD offline.
Options include:
Bitcoin Core
Electrum Wallet
- Read Using COLDCARD Offline (with Electrum 4.0.3).Wasabi Wallet
Unchained
Lily Wallet
Samourai Postmix
Samourai Premix
Descriptor
Generic JSON
Export XPUB
Dump Summary
Sign Text File
- Add a Bitcoin signature to a file already on your MicroSD card.
Upgrade from SD
- Upgrade the COLDCARD's firmware from a .dfu
file saved to a MicroSD card.
Clone Coldcard
- Use this feature to turn an extra, blank COLDCARD into a copy of another COLDCARD.
List Files
- Lists the files saved to the MicroSD card. Selecting a file shows the SHA-256 hash.
Format Card
- Formats the inserted MicroSD card and builds a new file system. Please note, formatting does not create a secure erase of the contents.