# COLDCARD — Full AI Context > Expanded machine-readable context for AI systems, including live firmware stats, > top release table, concepts, tools, and endpoint references. Generated: 2026-03-19T23:13:24Z ## Core concepts - Air-gapped signing: transactions can be signed without directly connecting to a computer. - PSBT workflow: COLDCARD uses BIP174 PSBT files for interoperable transaction signing. - Dual secure elements: dedicated chips protect high-value secrets. - Bitcoin-only focus: no altcoin support, reduced attack surface. ## Products - COLDCARD Q: flagship device with QWERTY keyboard, large screen, scanner, battery support. - COLDCARD Mk5: compact and affordable device with OLED screen and numeric keypad. ## Live platform summary - COLDCARD Mk4: 43 files (latest 5.4.5, date 2025-11-03) - COLDCARD Q: 40 files (latest 1.4.0Q, date 2026-03-05) - Edge Firmware: 13 files (latest 6.4.1QX, date 2025-11-25) - COLDCARD Mk3/Mk2: 12 files (latest 4.1.9, date 2023-06-26) - COLDCARD Mk: 2 files (latest 5.5.0, date 2026-03-05) - COLDCARD Mk1: 1 files (latest 3.0.6, date 2019-12-19) ## Top 20 firmware files (latest first) | # | Date | Platform | Version | File | |---|------|----------|---------|------| | 1 | 2026-03-05 | COLDCARD Mk | 5.5.0 | 2026-03-05T2052-v5.5.0-mk-coldcard.dfu | | 2 | 2026-03-05 | COLDCARD Q | 1.4.0Q | 2026-03-05T2051-v1.4.0Q-q1-coldcard.dfu | | 3 | 2025-11-25 | Edge Firmware | 6.4.1X | 2025-11-25T1618-v6.4.1X-mk4-coldcard.dfu | | 4 | 2025-11-25 | Edge Firmware | 6.4.1QX | 2025-11-25T1617-v6.4.1QX-q1-coldcard.dfu | | 5 | 2025-11-20 | Edge Firmware | 6.4.0X | 2025-11-20T1602-v6.4.0X-mk4-coldcard.dfu | | 6 | 2025-11-03 | COLDCARD Mk4 | 5.4.5 | 2025-11-03T1527-v5.4.5-mk4-coldcard.dfu | | 7 | 2025-11-03 | COLDCARD Q | 1.3.5Q | 2025-11-03T1525-v1.3.5Q-q1-coldcard.dfu | | 8 | 2025-09-30 | COLDCARD Mk4 | 5.4.4 | 2025-09-30T1238-v5.4.4-mk4-coldcard.dfu | | 9 | 2025-09-30 | COLDCARD Q | 1.3.4Q | 2025-09-30T1237-v1.3.4Q-q1-coldcard.dfu | | 10 | 2025-05-14 | COLDCARD Mk4 | 5.4.3 | 2025-05-14T1344-v5.4.3-mk4-coldcard.dfu | | 11 | 2025-05-14 | COLDCARD Q | 1.3.3Q | 2025-05-14T1343-v1.3.3Q-q1-coldcard.dfu | | 12 | 2025-04-16 | COLDCARD Mk4 | 5.4.2 | 2025-04-16T1907-v5.4.2-mk4-coldcard.dfu | | 13 | 2025-04-16 | COLDCARD Q | 1.3.2Q | 2025-04-16T1906-v1.3.2Q-q1-coldcard.dfu | | 14 | 2025-02-19 | Edge Firmware | 6.3.5X | 2025-02-19T1941-v6.3.5X-mk4-coldcard.dfu | | 15 | 2025-02-19 | Edge Firmware | 6.3.5QX | 2025-02-19T1939-v6.3.5QX-q1-coldcard.dfu | | 16 | 2025-02-13 | COLDCARD Mk4 | 5.4.1 | 2025-02-13T1415-v5.4.1-mk4-coldcard.dfu | | 17 | 2025-02-13 | COLDCARD Q | 1.3.1Q | 2025-02-13T1413-v1.3.1Q-q1-coldcard.dfu | | 18 | 2024-12-18 | Edge Firmware | 6.3.4X | 2024-12-18T1413-v6.3.4X-mk4-coldcard.dfu | | 19 | 2024-12-18 | Edge Firmware | 6.3.4QX | 2024-12-18T1407-v6.3.4QX-q1-coldcard.dfu | | 20 | 2024-09-12 | COLDCARD Mk4 | 5.4.0 | 2024-09-12T1734-v5.4.0-mk4-coldcard.dfu | ## Hardware wallet comparison (from docs) Y = Yes, N = No, P = Partial. Full page: https://coldcard.com/docs/compare-other-wallets/ | Feature | CC Q | CC Mk4 | CC Mk3 | Ledger X | Trezor T | BitBox2 | Jade | BitKey | |---|---|---|---|---|---|---|---|---| | **Security Highlights** | | | | | | | | | | Verifiable source code | Y | Y | Y | N | Y | Y | Y | P | | Onboard anti-phishing protection | Y | Y | Y | N | N | N | N | N | | Fully air-gapped operation | Y | Y | Y | N | N | N | Y | Y | | On screen destination verification | Y | Y | Y | Y | Y | Y | Y | N | | Multiple vendors for security chips | Y | Y | N | N | N | N | N | N | | Encrypted USB communication (MiTM protection) | Y | Y | Y | N | N | Y | N | N | | Encrypted backup via MicroSD | Y | Y | Y | N | N | N | N | N | | Secure secret sharing (Key Teleport) | Y | N | N | N | N | N | N | N | | Signed export files | Y | Y | N | N | N | N | N | N | | Self-destruct PIN | Y | Y | Y | N | Y | N | N | N | | Decoy/Duress wallet PIN | Y | Y | Y | Y | N | N | N | N | | **Supply Chain and Physical Security** | | | | | | | | | | Device linked to serialized, tamper-evident packaging | Y | Y | Y | N | N | N | N | N | | Viewable electronics | Y | Y | Y | N | N | N | N | N | | **Device Design** | | | | | | | | | | Qwerty Keyboard | Y | N | N | N | N | N | N | N | | QR Scanner | Y | N | N | N | N | N | N | N | | Verify Address Ownership | Y | Y | Y | N | Y | N | N | N | | MicroSD card slot | Y | Y | Y | N | Y | Y | N | N | | Dual MicroSD card slots | Y | N | N | N | N | N | N | N | | Password Manager | Y | Y | N | N | N | N | N | N | | Secure Notes | Y | N | N | N | N | N | N | N | | Physical keypad | Y | Y | Y | N | N | N | N | N | | Large Screen | Y | N | N | N | N | N | N | N | | Calculator Login | Y | N | N | N | N | N | N | N | | Dedicated secure element | Y | Y | Y | Y | N | Y | N | N | | USB-C connector | Y | Y | N | Y | Y | Y | Y | Y | | Battery powered | Y | N | N | Y | N | N | Y | N | | NFC-compatible | Y | Y | N | N | N | N | N | Y | | Bitcoin ONLY | Y | Y | Y | N | N | N | N | Y | | **Seed Options** | | | | | | | | | | User can increase seed-generation entropy | Y | Y | Y | N | N | N | N | N | | Easy to generate seed with user input | Y | Y | Y | Y | Y | N | Y | N | | Verifiable seed generation | Y | Y | Y | N | N | N | N | N | | BIP-85 seeds | Y | Y | Y | N | N | N | N | N | | Seed XOR integration | Y | Y | Y | N | N | N | N | N | | Temporary seeds | Y | Y | N | N | N | N | N | N | | Seed Vault (Multiple Seed Storage) | Y | Y | N | N | N | N | N | N | | SeedQR | Y | Y | N | N | N | N | Y | N | | **On-Device Transaction Functions** | | | | | | | | | | Show send/receive addresses | Y | Y | Y | Y | Y | Y | Y | N | | View QR codes | Y | Y | Y | N | Y | N | Y | N | | Better Bitcoin QR (BBQr) | Y | N | N | N | N | N | N | N | | NFC Push TX | Y | Y | N | N | N | N | N | N | | COLDCARD Co-Signing (CCC) | Y | Y | N | N | N | N | N | N | | Custom derivation paths | Y | Y | Y | N | N | N | N | N | | BIP-174 (PSBT) | Y | Y | Y | Y | N | Y | N | N | | BIP-370 (PSBTv2) | Y | Y | N | Y | N | N | N | N | | BIP-341 (Taproot)* | Y | Y | N | Y | Y | Y | N | N | | BIP-342 (Tapscript)* | Y | Y | N | Y | Y | N | N | N | | BIP-379 (Miniscript)* | Y | Y | N | Y | N | Y | Y | N | | Uses libsecp256k1 | Y | Y | Y | Y | Y | Y | Y | Y | ## AI endpoints - /llms.txt - /llms-full.txt - /api/ai-context - /.well-known/ai-plugin.json - /.well-known/openapi.json ## Site sections - /q - /mk4 - /mk5 - /downloads - /docs/ - /docs/faq - /docs/upgrade ## Attribution - Source: https://coldcard.com - Company: Coinkite Inc.