No official phone numbers are published by Coinkite. All communications are through email and social channels.
Coinkite is a Canada (CA)–based company recognized as one of the most security-focused hardware wallet makers in the Bitcoin industry. Founded in 2012, Coinkite is best known for its COLDCARD hardware wallet, a Bitcoin-only device that prioritizes maximum security, privacy, and sovereignty. Coinkite’s product range also includes the Opendime (Bitcoin bearer bond USB stick), Seedplate backup solutions, and other Bitcoin tools. With a commitment to Bitcoin maximalism, open-source firmware, and air-gapped security, Coinkite has become a trusted name for Bitcoiners seeking long-term, robust self-custody solutions.
COLDCARD Hardware Wallet: Bitcoin-only wallet with advanced features for professional users.
Air-Gapped Security: Supports PSBT (Partially Signed Bitcoin Transactions) via microSD — no USB needed.
Open-Source Firmware: Fully auditable software to ensure transparency.
Opendime Device: A physical Bitcoin bearer instrument, similar to a “Bitcoin stick.”
Seedplate & Backup Tools: Durable stainless steel solutions for seed phrase protection.
PIN & Brick-Me Features: Security measures like duress PINs and self-destruct to protect funds.
Multi-Sig Support: COLDCARD integrates easily with multisignature setups.
Bitcoin-Only Focus: No altcoins, ensuring strict attention to Bitcoin security.