Coldcard
Bitcoin Accounting

Coldcard + Clams

xPub Descriptor

Coldcard is an air-gapped, Bitcoin-only hardware wallet built for maximum security. Clams tracks your Coldcard using an xPub or descriptor exported via microSD. Your signing keys never leave the device. Full accounting visibility without compromising security.

What Clams tracks

  • All addresses from your wallet derivation paths
  • Incoming and outgoing transactions
  • Individual UTXOs with cost basis
  • Transaction fees paid
  • Capital gains on each spend

How it works

01

Export xPub or descriptor via microSD

On your Coldcard, export an xPub (single sig) or descriptor (single sig or multisig) to microSD. Your signing keys stay air-gapped.

02

Add connection in Clams

In Clams, add a new connection and select xPub or Descriptor. Paste the exported value from your microSD file.

03

Sync transaction history

Clams discovers all addresses and imports your full transaction history.

Resources

Coldcard xPub export guide

Official Coldcard docs for exporting xPub

Video walkthrough: xPub wallet setup

Coldcard descriptor export guide

Official Coldcard docs for exporting descriptors

Video walkthrough: Descriptor wallet setup

Frequently asked questions

What data does Clams import from Coldcard?

Clams imports all addresses derived from your xPub or descriptor, incoming and outgoing transactions, UTXOs, and calculates cost basis per UTXO. Your signing keys never leave the Coldcard.

Does Clams access my private keys?

No. Clams uses watch-only access via xPub or descriptor. Your signing keys stay air-gapped on your Coldcard. These only allow Clams to view addresses and transactions, not spend funds.

Can I track multiple Coldcard wallets?

Yes. Add each Coldcard wallet separately in Clams using its xPub or descriptor. Each wallet gets independent tracking and reporting.

Which Coldcard models are supported?

All Coldcard models are supported including Mk3, Mk4, and Q. Any device that can export an xPub or descriptor to microSD works with Clams.

How do I get capital gains reports from my Coldcard transactions?

Export your xPub or descriptor from Coldcard via microSD and add it to Clams. Clams calculates cost basis for every UTXO and tracks capital gains when you spend. Export reports from the Exports widget.

Do I need my Coldcard connected to sync new transactions?

No. Once you've added the xPub or descriptor to Clams, you can sync at anytime. Your Coldcard stays safely air-gapped.

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