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Coinkite

Maker of the open-source COLDCARD Bitcoin signing device.

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Accountability record

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Moderate 66 AI analysisMessage 50 · Thin
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

bugfix: detect RNG_SR_SEIS and RNG_SR_SECS, retry safely, and fail closed on persistent faults

This update fixes how the COLDCARD hardware wallet's random-number generator (RNG) handles rare hardware faults. Previously, the device could silently continue using weak or repeated random numbers if the RNG reported a seed error. Now it …

RNG seed-error flag detection added (RNG_SR_SEIS, RNG_SR_SECS)Bounded retry with recovery sequence instead of silent continuationFail-closed escalation on persistent RNG faults
82ced47aby scgbckbone+117−295 files
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Moderate 61 AI analysisMessage 50 · Thin
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

rng: discard 12 words after SEIS clear per RM0432 32.3.7

This commit changes how the COLDCARD hardware wallet's random-number generator (RNG) recovers from a rare 'seed error' condition. The manufacturer is now following an STMicroelectronics guideline to throw away the first 12 random numbers a…

RNG recovery routine previously did not discard post-recovery outputNew behavior follows vendor reference-manual recommendation (RM0432 32.3.7)Randomness is used for cryptographic key material in a hardware wallet
43b21392by scgbckbone+33−22 files
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Informational 15 AI analysisMessage 74 · Adequate
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

docs: why RNG clock errors don't invalidate RNG_DR

This commit only adds explanatory comments to two source files about why the COLDCARD firmware ignores certain hardware random-number-generator clock-error flags. It does not change any code behavior. The comments cite ST documentation say…

6e403982by scgbckbone+15−02 files
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Critical 91 AI analysisMessage 0 · Opaque
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

fixes rng

This commit fixes a critical random-number bug in COLDCARD hardware wallets. The device was accidentally using a weak, software-based fallback random generator instead of its secure hardware one when creating Bitcoin seed phrases. Because …

Weak/fallback PRNG silently linked in place of hardware RNGSeed phrase entropy reduction allowing private-key recoveryBuild-system override of upstream rng.o with empty object
ca724637by Peter D. Gray+60−711 files
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Low 27 AI analysisMessage 45 · Thin
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

apply note or pwd as b39 passphrase

This commit adds a new feature to the COLDCARD hardware wallet that lets users apply the text of a Secure Note or the value of a Secure Note password as their BIP-39 wallet passphrase. It also tightens how printable ASCII is checked in a f…

New feature exposes stored Secure Notes / Passwords as BIP-39 passphrasesInput validation relies on length, printable-ASCII, and rstrip of trailing whitespace/tab/newlineRefactored text sanitization changes control-flow for message signing and PSBT message warnings
0ef6413cby scgbckbone+223−289 files
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Low 43 AI analysisMessage 50 · Thin
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

BIP-322 changes after BIP got in to the complete state

This commit updates COLDCARD's BIP-322 (Bitcoin message signing / proof-of-reserves) implementation to match the finalized BIP-322 specification. The main user-visible change is that the message to be signed must now be embedded directly i…

BIP-322 message now embedded in PSBT and verified against reconstructed to_spend, reducing reliance on external/user-supplied message filesBIP-322 PSBTs are explicitly prevented from being finalized into broadcastable transactionsHSM policy now applies message-signing path restrictions to BIP-322 PSBTs
d656f371by scgbckbone+1106−61015 files
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Informational 15 AI analysisMessage 57 · Thin
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

docs: index all docs and fix drift vs firmware

This commit is purely a documentation update. It adds missing entries to the docs index, updates outdated examples and menu trees, fixes a broken filename reference in a code comment, and corrects factual details (such as supported models …

8e3bbfdfby scgbckbone+139−8315 files
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Moderate 66 AI analysisMessage 28 · Opaque
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

bundle small fixes

This is a large bundle of bug fixes for the COLDCARD hardware wallet firmware. Most changes fix user-interface crashes ('yikes'), incorrect error messages, or policy edge cases rather than a single critical vulnerability. The most security…

HSM mode now disables NFC and Virtual Disk peripherals to reduce USB/NFC attack surfaceSingle-Signer Spending Policy unlock no longer accepts a zero-secret bypass PIN as the 'main PIN'OP_RETURN and non-standard scripts are no longer hidden as 'null-data' during transaction review
c36eac23by scgbckbone+1486−28548 files
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Low 48 AI analysisMessage 45 · Thin
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

bugfix: Delta Mode Trick PIN restore from backup

This commit fixes a bug where a special security feature called 'Delta Mode Trick PIN' was not being restored when a user restored their Coldcard wallet from a backup. A Trick PIN is a decoy PIN that can do things like show a fake wallet o…

Functional bug in security feature (Trick PIN restore)Silent failure due to bare exception handlerMismatch between function return value and caller (tuple unpack)
be614dabby scgbckbone+235−1306 files
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Informational 0 AI analysisMessage 18 · Opaque
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

new bootloader

This commit adds a new pre-built bootloader release (version 3.3.0) for the COLDCARD Mk4 hardware wallet. It consists of binary firmware files and a hash manifest, plus a disassembly listing. There is no source code change, no vulnerabilit…

02b5a756by Peter D. Gray+34698−05 files
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Informational 21 AI analysisMessage 0 · Opaque
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

Mk hardware

This commit adds support for a new COLDCARD hardware revision, the Mk5. It is a routine product-enablement patch: it teaches the firmware, bootloader, build system, simulator, and signing tools to recognize and run on Mk5 devices. There is…

No security-relevant signals detected in the diff.Change is hardware bring-up / product enablement only.No fixes for memory corruption, authentication bypass, cryptographic flaws, or privilege escalation.
38553d1aby Peter D. Gray+728−27643 files
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Moderate 59 AI analysisMessage 0 · Opaque
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

WIF Store

This commit adds a new 'WIF Store' feature to the COLDCARD firmware. It lets users import external Bitcoin private keys (in WIF format) and use them to sign PSBT transactions and messages, alongside the device's normal seed-derived keys. T…

New feature adds persistent storage of arbitrary private keys in device settingsPSBT signing path now branches on whether a required pubkey is in the WIF storeAddress ownership verification now recognizes WIF-store addresses as 'ours'
9b131b2eby scgbckbone+1243−8222 files
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Low 42 AI analysisMessage 38 · Opaque
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

BIP-322 msg verification

This commit adds a new user-facing verification step for BIP-322 'Proof of Reserves' messages on the COLDCARD hardware wallet. Before signing a proof-of-reserves transaction, the device now asks the user to import or type the original huma…

Adds user-verifiable message display before BIP-322 proof-of-reserves signingAdds hash-equality check between supplied message and PSBT embedded message hashIntroduces new untrusted input paths: NFC, QR/BBQR, SD card, virtual disk, and on-device keyboard for BIP-322 messages
ef2f35b1by scgbckbone+218−166 files
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Low 37 AI analysisMessage 45 · Thin
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

BIP-322 Proof of Reserves

This commit adds support for BIP-322 Proof of Reserves signing on COLDCARD hardware wallets. It lets users prove they control certain Bitcoin addresses by signing a special non-spending transaction, without actually moving funds. The chang…

New transaction parsing path accepts nVersion=0 under a specific POR heuristicPOR detection relies on a single zero-amount OP_RETURN output (scriptPubKey == b'\x6a')POR validation parses and constrains the embedded 'to_spend' transaction from the 0th input's non-witness UTXO
5d7d5d88by scgbckbone+816−157 files
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Informational 11 AI analysisMessage 55 · Thin
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

test we show BIP-39 passphrase

This commit only adds a single line to a test file. It checks that when a user adds a BIP-39 passphrase to create a temporary seed, the COLDCARD device displays the passphrase back to the user on screen. This is a test-only change and does…

06879c59by Peter D. Gray+1−01 file
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Informational 23 AI analysisMessage 45 · Thin
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

show BIP-39 passphrase on-screen

This change makes the COLDCARD hardware wallet display the user's BIP-39 passphrase on the device's own screen after it is applied. This is a deliberate UX change, not a hidden bug. It could slightly increase the risk that someone physical…

Sensitive user secret (BIP-39 passphrase) rendered in on-screen UI messageNo input validation, encryption, or access-control changesNo remote or USB-exposed behavior changed
21392bd3by Peter D. Gray+14−61 file
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Moderate 63 AI analysisMessage 50 · Thin
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

address format matching from PSBT witness/redeem script instead of PSBT_XPUBs derivation paths

This change fixes how COLDCARD figures out the address format for multisig transactions. Previously it guessed based on the derivation path numbers in the PSBT's XPUB records, which can be misleading or attacker-controlled. Now it looks di…

Removed derivation-path-based address-format inference that trusted PSBT_XPUB path dataAdded script-based address-format inference from witness_script / redeem_scriptAdded N == len(self.xpubs) consistency check in multisig script parsing
ef0ba6a5by scgbckbone+154−354 files
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High 80 AI analysisMessage 28 · Opaque
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

deltamode timing fix

This commit fixes a bug in COLDCARD's 'deltamode' duress feature. Delta mode is meant to let a thief who knows a slightly wrong PIN sign transactions with corrupted signatures that look valid but don't actually protect any bitcoin. The bug…

duress/deltamode bypasspredictable signing digest replaced with transaction-dependent digestprivate-key recovery claimed by independent researchers
fcd848d8by Peter D. Gray+9−91 file
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Low 42 AI analysisMessage 45 · Thin
CK CoinkiteCOLDCARD firmware BitcoinHardware wallets

fix SSSP unable to find unlock policy PIN

This is a small bug fix in the COLDCARD hardware wallet's 'trick PIN' feature. Trick PINs let users set up special PINs that do things like wipe the device or unlock specific spending policies. The fix makes the device refresh its trick-PI…

State synchronization bug in security-critical PIN lookupTrick PIN / duress feature correctness fixNo explicit security framing by vendor in commit message
52e7c755by scgbckbone+1−01 file
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