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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Get Started with COLDCARD

Written by Coinkite Team

Applies to: COLDCARD Q, Mk5, and Mk4

Verified on: July 17, 2026

Start with the instructions for the model in your hands. Do not enter a seed phrase from another wallet until you have checked the numbered tamper-evident bag, device, and first-boot security indicators.

Choose your setup

COLDCARD Q

Use the Q setup guide for the keyboard, QR scanner, battery power, and Q-specific controls.

Set up COLDCARD Q

COLDCARD Mk5

Use the Mk5 setup guide for the compact keypad, MicroSD, NFC, and USB-C workflow.

Set up COLDCARD Mk5

COLDCARD Mk4

The official Quickstart covers bag inspection, power, PIN creation, and seed setup for the Mk series.

Open the Mk Quickstart

First-session checklist

Use the short checklist to verify a receive address, receive a small amount, sign once, and test recovery before relying on the wallet.

Start your first session

Before this wallet holds more than spending money, complete the savings security checklist. It covers current firmware, separate spending and savings seeds, optional dice, passphrases, durable backups, and a full recovery test.

Your seed words, PIN, passphrase, backup password, and private keys are secrets. Coinkite support does not need them. Never paste them into a website, support ticket, chat, phone, or computer.

Open the current official setup documentation