COLDCARD Security Advisory A seed-generation defect affected releases beginning with firmware 4.0.1. Fixed firmware is available. Existing affected seeds still require migration. Check status
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Wallet Software for COLDCARD

Written by Coinkite Team

Applies to: COLDCARD Q, Mk5, and Mk4

Verified on: July 17, 2026

Coordinator software builds transactions, tracks wallet history, and broadcasts signed transactions. COLDCARD keeps the private keys and performs signing. The available transport and wallet features depend on the coordinator, operating system, COLDCARD model, and software version.

Software routes

Compatible wallets and tools

Review the current official overview of desktop, mobile, node, and financial tools used with COLDCARD.

Open Compatible Software Wallets

Sparrow Wallet setup

Export a watch-only wallet, import it into Sparrow, and verify the receive address on COLDCARD before funding.

Open the Sparrow setup guide

Community guides

Find additional software-specific instructions. Treat third-party pages as external guidance and verify security-sensitive steps against current COLDCARD Docs.

Open Community Guides

Build and sign a PSBT

Use the signing reference after the watch-only wallet or coordinator has been configured.

Open Ready To Sign

Never import COLDCARD seed words into coordinator software. A watch-only wallet needs public wallet data, not the seed, PIN, or passphrase.