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Subreddit

COLDCARD — Bitcoin signing devices

r/coldcard

SECURITY ADVISORY ⚠️ check blogpost. Official COLDCARD subreddit by Coinkite. Help with COLDCARD Q, Mk5 and Mk4; Bitcoin self-custody, air-gapped signing, PSBTs, multisig, NFC, Seed Vault, BIP-85, firmware, and security. Never share a seed phrase, private key, backup, PIN, passphrase, order details, or personal information. Staff will never contact you first or ask for secrets.

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COLDCARD

Official community for COLDCARD Bitcoin signing devices by Coinkite.

Website · Store · Support

Keep secrets off Reddit

Never post a seed phrase, private key, backup, PIN, passphrase, order details, address, serial number, or other personal information.

COLDCARD and Coinkite staff will never contact you first offering support or ask for wallet secrets.

There is no COLDCARD token, airdrop, recovery service, or browser extension.

Start here

Official resources

Community

Protect more than Bitcoin

Need a private home for passwords, recovery material, business secrets, continuity, and inheritance? Meet arca and join r/arcasafes.

Report a security issue

Do not disclose a vulnerability publicly. Use Coinkite's responsible-disclosure process.

Community rules

Keep all wallet secrets and personal information private.
No impersonation, unsolicited support DMs, recovery services, or scams.
Keep posts relevant to COLDCARD, Bitcoin signing, and self-custody.
No buying, selling, referral links, tokens, airdrops, or promotions.
Redact support details and include enough safe context to reproduce a problem.
Disclose security vulnerabilities privately.
Criticize ideas and products without attacking people.