# Coldcard

> Bitcoin-only hardware wallet by Coinkite. Air-gapped via PSBT-on-SD. Reference signer for Bitcoin maxis.

**Canonical URL:** https://www.xmr.club/wallets/coldcard
**Category:** wallets / Hardware
**Grade (xmr.club rubric):** A
**KYC posture:** light_kyc
**Features:** non_custodial, open_source, multisig_supported, audited
**Highlights:** HARDWARE, BTC-ONLY, PSBT
**Fees:** $120 hardware · Bitcoin-only · PSBT-via-SD
**Website:** https://coldcard.com
**Last verified:** 2026-05-13
**Uptime probe:** up (HTTP 200, 294ms) · checked 2026-05-13T10:07:28.616Z

## Editorial review

Bitcoin-only hardware wallet that signs PSBTs via SD card — never plugs into a network-connected machine. Open-source firmware, secure element (Microchip ATECC608A). 'Mk4' model is current; supports BIP39/BIP85, taproot, multisig. The signer pattern of choice when paired with Sparrow/Specter for multi-vendor multisig setups.

## Citation

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