How does Coldcard stay secure if it’s not connected to a PC?

Coldcard uses air-gapped signing via microSD cards and PSBT files, keeping private keys offline.

Customer also Asked?

Sweety tank’s Query

Unable to withdraw usdt tron for last 12 hours! When this issue get resolved?

Reply: We have registered your request regarding the issue you are facing. A callback from the support team has been scheduled, and you will be contacted shortly on your registered contact details. Please ensure that your registered phone number or email remains accessible so the team can reach you without delay.

FAJAR SUTRISNO’s Query

Why you rejected my kyc, i have sumsub account i m Indonesian people, let's check firt oh my god

Reply: We have flagged your case to the verification team for a recheck. Kindly ensure your Indonesian ID/passport is valid, details exactly match your account, and the liveness check is completed in good lighting. Our team will contact you shortly with an update.

Massimo Contrucci’s Query

Is the affiliate program active? How can I sign up as affiliate?

Reply: Upbit does have a referral system, that offers a commission on referred users’ trading fees—potentially up to 50%. However, it does not operate like a full affiliate marketing program. Upbit maintains a referral or promotional code page for inviting new users..

Wayne Holland’s Query

I want to add $2000 to my account can you ring me on a secure line to complete the Thanks Wayne Holland *******

Reply: Your callback has been confirmed as requested.

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How does Coldcard stay secure if it’s not connected to a PC?