Website/_docs/coldcard.md

title	subtitle	tags
Coldcard with Bluewallet	Using a Lightning SD card	hww usage featured

In this video you will see the usage of PSBT, watch-only wallets. And how to send transactions offline with your Coldcard and Bluewallet.

Using a Lightning to SD adaptor

• Start the Coldcard device, go to Advanced ➤ MicroSD Card ➤ Export Wallet ➤ Electrum Wallet. Put the SD card into Coldcard. Choose Native Segwit. It should create the wallet skeleton file on SD card.
• Put the SD card into the adaptor, go to the import wallets screen and choose your file.
• Create a transaction from this watch-only wallet, when prompted - export it to a file and save it in your folder.
• Put the SD card into the Coldcard, go to "Ready To Sign" and proceed with signing the transaction.
• Put the SD card into the adaptor. There should be 2 new files:
  • a file with the transaction hex that is ready to broadcast (*-final.txn)
  • a signed transaction file (*-signed.psbt)
  • Choose the signed transaction file ('*-signed.psbt)
• Tap send! You are done :)