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Blockstream Jade

Firmware for Jade and Jade Plus Bitcoin hardware wallets.

BitcoinHardware walletsElevated watch
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Repository coverage

414 commits in the local evidence base

Every captured commit receives deterministic security triage and a separate communication-quality score. Security candidates and broader second-pass signals receive full-patch Ollama analysis.

93security candidates58second-pass queue126AI analyses
10commits · 30 days
67commits · 60 days
198commits · 180 days
414commits · 365 days
Backfill bands
Aug 5 → Feb 6216 seen38 candidatesComplete
Feb 6 → Jun 6131 seen9 candidatesComplete
Jun 6 → Jul 657 seen10 candidatesComplete
Jul 6 → Aug 510 seen0 candidatesComplete
Commit communication

Does the history explain itself?

Message quality measures whether a commit identifies its scope, purpose, rationale, testing, and supporting references. It does not change the security-severity score.

57/100 average clarity
32Strong · 80–100
147Adequate · 60–79
203Thin · 40–59
32Opaque · 0–39
3security candidates with opaque commit messaging
Read the scoring rubric →
Developer activity

Who is changing the project?

Public Git author strings; identities are not independently verified.

DeveloperCommitsCandidatesAnalyzedHigh riskMessage avg.
Jon Griffiths2755271157
Mike Tolkachev311116155
Daniel Newton651519055
Mihailo Milenkovic878057
Jamie C. Driver525053
Gustavo Cateim711079
Austin-Fulbright411060
cmiguelrn111045
quantpoet111072
roderico111045
tokyovyse111063
Valerio Vaccaro200045
Analysis record

Published AI watches

Last scanned 31 minutes ago

Informational 15 AI analysisMessage 68 · Adequate
BS BlockstreamBlockstream Jade BitcoinHardware wallets

hardware: add Jade Plus design files

This commit reorganizes existing hardware design files for the original Jade device into a new subfolder and adds the open-source hardware design files for a new product, the Jade Plus. It does not change any software, firmware, or device …

5ad85661by bitcoinhelp+2573−122520 files
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Low 27 AI analysisMessage 86 · Strong
BS BlockstreamBlockstream Jade BitcoinHardware wallets

input: release touch handles before deleting the i2c bus

This commit fixes a bug where the touchscreen driver failed to clean up internal handles when shutting down. On newer ESP-IDF firmware, this cleanup failure caused the device to panic and freeze during boot and when using the camera or QR …

Device freeze/DoS-like symptom on affected hardwareMemory leak fixedNo input validation, authentication, or cryptographic weakness visible
36776fecby Gustavo Cateim+3−01 file
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Informational 15 AI analysisMessage 35 · Opaque
BS BlockstreamBlockstream Jade BitcoinHardware wallets

jade_cli: add selfcheck command

This commit adds a new command-line command called 'selfcheck' to the Jade CLI tool. It simply calls an existing device function and prints the result. There is no indication of a security fix or vulnerability being patched.

32d3c9a7by Jon Griffiths+10−01 file
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Low 42 AI analysisMessage 95 · Strong
BS BlockstreamBlockstream Jade BitcoinHardware wallets

Liquid (taproot): add sign_liquid_tx genesis blockhash support

This commit changes how Blockstream Jade handles the 'genesis blockhash' when signing Liquid transactions. Previously, the device only accepted the network's built-in genesis hash. Now it lets users provide a custom genesis hash for test n…

Adds input validation for caller-supplied genesis blockhashPrevents mainnet genesis hash from being used on Liquid test networksRestricts genesis_hash parameter to Liquid networks only
888eff30by Jon Griffiths+82−264 files
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Low 48 AI analysisMessage 62 · Adequate
BS BlockstreamBlockstream Jade BitcoinHardware wallets

rpc: annotate functions returning error codes to ensure they are checked

This commit adds compiler annotations (WARN_UNUSED_RESULT) to functions that return success/failure codes, so the compiler will warn if a caller ignores the result. It also fixes a few places where return values were being ignored, replaci…

Functions returning error/success codes annotated with WARN_UNUSED_RESULTCallers now check return values of rpc_get_bip32_path() and rpc_get_boolean()Use of default-value helpers (rpc_get_boolean_or) to ensure predictable behavior on missing fields
517075baby Mike Tolkachev+24−215 files
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Informational 15 AI analysisMessage 45 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

rpc: rename get_uint64_t to get_uint64

This commit simply renames an internal helper function from `rpc_get_uint64_t` to `rpc_get_uint64` and updates every place that calls it. There are no changes to what the function does, how it checks data, or how secure it is. It is a rout…

8e0de45eby Jon Griffiths+11−117 files
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Informational 15 AI analysisMessage 45 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

rpc: rename get_boolean to get_bool

This commit is a simple rename of two internal helper functions from `rpc_get_boolean`/`rpc_get_boolean_or` to `rpc_get_bool`/`rpc_get_bool_or`, updating all call sites accordingly. There is no change to what the code does, no bug fix, and…

f6e946acby Jon Griffiths+24−2518 files
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Informational 15 AI analysisMessage 50 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

rpc: refactor app code to use getters with default values

This commit is a straightforward code cleanup that replaces verbose 'read this optional value, or leave the default' patterns with shorter helper functions that do the same thing. There is no change in behavior and no security issue visibl…

b6a07147by Mike Tolkachev+22−348 files
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Moderate 59 AI analysisMessage 35 · Opaque
BS BlockstreamBlockstream Jade BitcoinHardware wallets

assets: improve precision checking

This commit tightens how Blockstream Jade handles the 'precision' value in asset contracts for Liquid assets. Previously, a very large precision value could be accepted and later used to read past the end of an internal lookup table (POW_1…

Out-of-bounds read mitigation: bounds-checking of user-controlled precision before indexing fixed-size POW_10 arrayInteger truncation safety: explicit cast of validated precision to uint8_t after range checkCompile-time invariant enforcement: JADE_STATIC_ASSERT ties array size to ASSET_PRECISION_MAX
fd0f625dby Mike Tolkachev+13−13 files
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Informational 15 AI analysisMessage 35 · Opaque
BS BlockstreamBlockstream Jade BitcoinHardware wallets

docker: update jade_builder

This commit simply updates the SHA256 digest of the 'blockstream/jade_builder' Docker image used for building and testing Jade in four configuration files. There is no code change, no disclosed security fix, and no evidence in the commit o…

00e7a397by Jon Griffiths+5−54 files
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Low 40 AI analysisMessage 78 · Adequate
BS BlockstreamBlockstream Jade BitcoinHardware wallets

libjade: add camera/input/nvs support, refactor

This commit is a large feature/refactor patch for Blockstream Jade's libjade (a desktop emulator of the Jade hardware wallet). It adds RPC endpoints that let a host application read the emulated device's screen, push fake button presses, r…

New RPC endpoints allow external read/write of emulated NVS storageNew RPC endpoints allow external screen capture and synthetic input injectionNew RPC endpoints allow external camera frame injection
f7184945by Daniel Newton+1806−75832 files
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Informational 15 AI analysisMessage 45 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

Fix M5StickC Plus 2 PIN navigation

This commit fixes a user-interface navigation quirk on the M5StickC Plus 2 hardware for Blockstream Jade. When entering a PIN, the up/down button directions were not inverted to match the rest of the device's menus, making number entry con…

9de1409eby roderico+3−21 file
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Low 36 AI analysisMessage 74 · Adequate
BS BlockstreamBlockstream Jade BitcoinHardware wallets

build: annotate functions returning error codes to ensure they are checked

This commit is a preventive build-hardening change. It adds compiler annotations (WARN_UNUSED_RESULT) to many functions that return success/failure codes, so the compiler will warn if a caller ignores the result. The goal is to catch futur…

Compiler annotation added to enforce checking of error-returning functionsNo specific vulnerability fixed in the diffNo functional code changes or call-site fixes included
909a89aaby Mike Tolkachev+215−15225 files
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Low 46 AI analysisMessage 45 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

identity: add identity string validation

This commit adds a safety check to Blockstream Jade's 'sign identity' feature. Before the change, the device would accept any identity string a connected app sent. Now it rejects identities that contain non-printable or unusual characters.…

Input validation added to a signing/identity processNew length-bounded string helper reduces reliance on null-terminationRejection of non-printable characters in user-presented identity string
53752b98by Mike Tolkachev+22−02 files
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Informational 22 AI analysisMessage 50 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

otp: show error on invalid issuer, share logging strings

This commit tightens error handling when decoding the 'issuer' field of an OTP (one-time password) setup URI. Previously, a malformed issuer string could fail to decode silently; now the device shows an error and cancels the operation inst…

Input validation added for OTP URI issuer fieldSilent failure on malformed URL-decoding replaced with explicit error returnDebug assertion added for label/issuer URL-decoding in UI display path
66c945f2by Mike Tolkachev+9−52 files
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Low 42 AI analysisMessage 28 · Opaque
BS BlockstreamBlockstream Jade BitcoinHardware wallets

psbt: fix path size

This commit fixes a small but meaningful bug in how Jade, a hardware wallet, reads key paths from Bitcoin PSBT data. The code was passing the byte size of a buffer when it should have passed the number of 32-bit entries. Depending on how t…

Buffer-size semantic mismatch in security-critical PSBT parsingUse of sizeof() on uint32_t array where element count is expectedCode path involved in 2of3 multisig recovery key identification
9e0c3747by Mike Tolkachev+2−21 file
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Moderate 57 AI analysisMessage 50 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

sign: match sign_tx logic for output commitment checking

This commit fixes a logic gap in how Blockstream Jade checks cryptographic commitments for transaction outputs during signing. Previously, the code treated a missing commitment the same as an invalid one, which could cause the device to re…

Inconsistent commitment validation between signing code pathsPossible transaction signing failure or acceptance of unvalidated output commitmentsLogic alignment with existing sign_tx commitment handling
be05deacby Jon Griffiths+5−21 file
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Low 26 AI analysisMessage 45 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

utils: fix params_additional_info return type

This commit changes the declared return type of a transaction-signing helper function from a transaction-type code (TxType_t) to a simple success/fail boolean (bool). The function body already appears to return true/false, so the change fi…

Return-type mismatch between function declaration/definition and headerFunction is in transaction-signing utility code (sign_utils.c/h)Function handles CBOR transaction parameters and writes output transaction metadata
3d6cdbcbby Jon Griffiths+2−22 files
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Moderate 61 AI analysisMessage 35 · Opaque
BS BlockstreamBlockstream Jade BitcoinHardware wallets

url: improve bounds checking

This commit tightens bounds checks in URL encoding/decoding functions used in Blockstream Jade, a hardware wallet. The changes fix potential off-by-one/out-of-bounds memory reads and writes when handling percent-encoded characters. Because…

Bounds-check rewrite in URL decoder to prevent out-of-bounds reads before percent-decodingCast to unsigned char moved into isxdigit() to avoid undefined behavior with signed char inputsDestination bounds checks in URL encoder changed from pointer-subtraction form to remaining-space form, mitigating possible underflow/wrap
c045aeacby Mike Tolkachev+5−71 file
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Moderate 59 AI analysisMessage 50 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

sign_psbt: add early reject on wrong genesis blockhash

This commit fixes a bug in the Blockstream Jade hardware wallet's PSBT (Partially Signed Bitcoin Transaction) signing code. Previously, when the transaction's genesis block hash did not match the expected network, the code set an error mes…

Missing return in error path allows execution to continue after validation failureCross-network genesis hash mismatch not enforced as a hard failurePSBT signing logic accepts mismatched network parameters
56e130b0by Mike Tolkachev+1−01 file
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Lower-priorityusb: avoid memory allocations for ota chunk databy Jon Griffiths · f0ebdd09 · Oct 23, 2025 · 1 fileMessage 45 · ThinTriage 0Details
Commit message · Jon Griffiths

usb: avoid memory allocations for ota chunk data

Prevents fragmentation.

45/100 · ThinMessage clarity
✓ Descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Lower-priorityusb: refactor the ota data loopby Jon Griffiths · e260f656 · Oct 23, 2025 · 1 fileMessage 68 · AdequateTriage 0Details
Commit message · Jon Griffiths

usb: refactor the ota data loop

- Allow parallelism by waiting on the previous data packet not the current one
- Handle scenarios where the ota process stops responding to our messages
- Clean up error handling to simplify the loop logic.

68/100 · AdequateMessage clarity
✓ Descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context
AI review queuedusb: simplify handle_ota_reply logicby Jon Griffiths · 1e51b96c · Oct 23, 2025 · 1 fileMessage 35 · OpaqueTriage 0Details
Commit message · Jon Griffiths

usb: simplify handle_ota_reply logic

35/100 · OpaqueMessage clarity
✓ Descriptive subject! No meaningful explanatory body
Why it was queued
second-pass: opaque commit message
Lower-priorityusb: set event bits atomicallyby Jon Griffiths · 53bc9c8d · Oct 23, 2025 · 1 fileMessage 45 · ThinTriage 0Details
Commit message · Jon Griffiths

usb: set event bits atomically

45/100 · ThinMessage clarity
✓ Descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Lower-priorityusb: rename the interface mutex to reflect it is a mutexby Jon Griffiths · 25598dc3 · Oct 23, 2025 · 1 fileMessage 50 · ThinTriage 0Details
Commit message · Jon Griffiths

usb: rename the interface mutex to reflect it is a mutex

50/100 · ThinMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Lower-priorityusb: don't hold the callback mutex during the callbackby Jon Griffiths · 21229c99 · Oct 23, 2025 · 1 fileMessage 73 · AdequateTriage 0Details
Commit message · Jon Griffiths

usb: don't hold the callback mutex during the callback

Note that the callback is called via trigger_event() from a single thread
only and so holding the mutex while calling it is pointless. If the callback
triggers code which attempts to unset the callback (for example, during error
handling), then this will deadlock.

Instead, use the mutex only to protect reading and writing the callback and
context variables themselves.

73/100 · AdequateMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context
Lower-priorityusb: delete impossible-to-reach codeby Jon Griffiths · d550d332 · Oct 23, 2025 · 1 fileMessage 45 · ThinTriage 0Details
Commit message · Jon Griffiths

usb: delete impossible-to-reach code

45/100 · ThinMessage clarity
✓ Descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Lower-prioritydescriptor: early-reject descriptors with too many signersby Jon Griffiths · 72cc31db · Oct 23, 2025 · 2 filesMessage 50 · ThinTriage 0Details
Commit message · Jon Griffiths

descriptor: early-reject descriptors with too many signers

Reported-by: DARKNAVY <X@DarkNavyOrg>

50/100 · ThinMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
AI review queuedtext fixesby Daniel Newton · 1f9b4b86 · Oct 22, 2025 · 2 filesMessage 0 · OpaqueTriage 0Details
Commit message · Daniel Newton

text fixes

0/100 · OpaqueMessage clarity
! Very short subject! Too few words to establish purpose! No meaningful explanatory body
Why it was queued
second-pass: opaque commit message
Lower-priorityusb: only set the usb connect activity when it is initially createdby Jon Griffiths · dfcb0fb1 · Oct 21, 2025 · 1 fileMessage 65 · AdequateTriage 0Details
Commit message · Jon Griffiths

usb: only set the usb connect activity when it is initially created

its already re-set for us after help is shown.

65/100 · AdequateMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Provides an explanatory body
Lower-priorityUpdate readme to show all dependencies needed to run test_jade.pyby Daniel Newton · 24deb001 · Oct 20, 2025 · 1 fileMessage 50 · ThinTriage 0Details
Commit message · Daniel Newton

Update readme to show all dependencies needed to run test_jade.py

50/100 · ThinMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Why it was queued
documentation-only discount
Lower-priorityusb: increase timeout to detect slower usb storage devicesby Daniel Newton · 1ff0e587 · Oct 15, 2025 · 1 fileMessage 50 · ThinTriage 0Details
Commit message · Daniel Newton

usb: increase timeout to detect slower usb storage devices

50/100 · ThinMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Lower-priorityusb: remove need to unplug usb storage device to finish unloading usb libsby Daniel Newton · e48b0146 · Oct 15, 2025 · 1 fileMessage 50 · ThinTriage 0Details
Commit message · Daniel Newton

usb: remove need to unplug usb storage device to finish unloading usb libs

50/100 · ThinMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Lower-priorityusb: dont create background task for msc_host_installby Daniel Newton · ea5b2fd7 · Oct 15, 2025 · 1 fileMessage 50 · ThinTriage 0Details
Commit message · Daniel Newton

usb: dont create background task for msc_host_install

Eliminates the "Processing..." freeze.

50/100 · ThinMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Lower-priorityusb: add visual logging system to usb storage code for debuggingby Daniel Newton · 9e7f4ba3 · Oct 15, 2025 · 2 filesMessage 50 · ThinTriage 0Details
Commit message · Daniel Newton

usb: add visual logging system to usb storage code for debugging

50/100 · ThinMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Security candidatebuild: further verify signature digests in signed v2 binariesby Jon Griffiths · 690c8b1c · Oct 14, 2025 · 1 fileMessage 77 · AdequateLow 42Details
Commit message · Jon Griffiths

build: further verify signature digests in signed v2 binaries

77/100 · AdequateMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope✓ Mentions testing or verification✓ Names security-relevant behavior explicitly! No meaningful explanatory body
Why it was queued
signing boundary
AI analysis · Low 42/100

This change tightens a build-time signing script for Blockstream Jade hardware wallet firmware. It adds checks that the public-key digests recorded inside a signed binary match the digests of the keys that were actually used to sign it, and makes the script stop on any error. The patch is defensive: it reduces the chance that a corrupted or wrongly-signed firmware image is produced during release, but it does not by itself fix a vulnerability in already-shipped devices.

Security candidatebuild: minor error handling tweak for v2 pem signingby Jon Griffiths · 1d797de3 · Oct 12, 2025 · 1 fileMessage 62 · AdequateInformational 15Details
Commit message · Jon Griffiths

build: minor error handling tweak for v2 pem signing

62/100 · AdequateMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope! No meaningful explanatory body
Why it was queued
signing boundarysigning or wallet path
AI analysis · Informational 15/100

This is a tiny build-script change that replaces a silent failure with a clear error message when required signing key files are missing. It does not change what the script does, only what it prints when it fails. There is no security vulnerability here.

AI review queuedgui: include semphr.hby Jon Griffiths · 6de067ff · Oct 9, 2025 · 1 fileMessage 28 · OpaqueTriage 0Details
Commit message · Jon Griffiths

gui: include semphr.h

28/100 · OpaqueMessage clarity
✓ Subject identifies a change! No meaningful explanatory body
Why it was queued
second-pass: opaque commit message
Lower-prioritycbor: avoid passing null to memcpy with len 0 in tinycborby Jon Griffiths · 22af7035 · Oct 8, 2025 · 1 fileMessage 50 · ThinTriage 0Details
Commit message · Jon Griffiths

cbor: avoid passing null to memcpy with len 0 in tinycbor

Found by asan.

50/100 · ThinMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Security candidateotp: avoid signed left shiftby Jon Griffiths · 7c8fd718 · Oct 8, 2025 · 1 fileMessage 45 · ThinLow 32Details
Commit message · Jon Griffiths

otp: avoid signed left shift

Found by ubsan.

45/100 · ThinMessage clarity
✓ Descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Why it was queued
authentication path
AI analysis · Low 32/100

This commit fixes a subtle programming bug in the code that decodes base32 one-time-password (OTP) secrets. The bug involves shifting a signed integer left, which is undefined behavior in C and was caught by an undefined-behavior sanitizer. The fix changes the variable from a signed integer to an unsigned integer so the shift is well-defined. The practical security impact is likely low, but undefined behavior in cryptographic/OTP handling is generally undesirable because compilers may optimize it unpredictably.

Lower-prioritychange QR scan box to use the largest centered square of the camera image (minus a small margin)by Daniel Newton · 719fa40c · Oct 7, 2025 · 3 filesMessage 50 · ThinTriage 0Details
Commit message · Daniel Newton

change QR scan box to use the largest centered square of the camera image (minus a small margin)

50/100 · ThinMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Security candidateUpdate python/pinserver libwally to 1.5.1by Jon Griffiths · 5e5df8c9 · Sep 29, 2025 · 2 filesMessage 45 · ThinLow 25Details
Commit message · Jon Griffiths

Update python/pinserver libwally to 1.5.1

45/100 · ThinMessage clarity
✓ Descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Why it was queued
authentication path
AI analysis · Low 25/100

This commit simply updates a dependency called 'wallycore' used by the Blockstream Jade PIN server from version 1.4.0 to 1.5.1. It changes the version number and the list of cryptographic fingerprints (hashes) that verify the downloaded package. The commit message does not say why the update was made or whether it fixes any security issue. Without knowing what changed between 1.4.0 and 1.5.1, we cannot tell if this is a routine maintenance update or a security fix.

Security candidatepsbt: allow pset signing from usb/qrcodesby Jon Griffiths · 4fc854e9 · Sep 29, 2025 · 3 filesMessage 45 · ThinLow 30Details
Commit message · Jon Griffiths

psbt: allow pset signing from usb/qrcodes

45/100 · ThinMessage clarity
✓ Descriptive subject✓ Names a concrete action or component! No meaningful explanatory body
Why it was queued
signing boundarysigning or wallet path
AI analysis · Low 30/100

This commit lets a Blockstream Jade hardware wallet automatically detect whether a transaction file is for Bitcoin or the Liquid sidechain (including test networks) when signing via QR codes or USB. Before, the wallet always assumed Bitcoin, which could cause it to fail or behave incorrectly when signing a Liquid transaction through those offline methods. The change itself is a feature fix and does not appear to introduce a security vulnerability.

Lower-priorityqr: Show brightness controls when displaying animated qrcodesby Jon Griffiths · b9cc4c24 · Sep 29, 2025 · 4 filesMessage 65 · AdequateTriage 0Details
Commit message · Jon Griffiths

qr: Show brightness controls when displaying animated qrcodes

Simplify the associated code since we no longer display a help button
outside of the options section.

65/100 · AdequateMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Provides an explanatory body
Lower-priorityqr: display the parent activity help when showing qr display optionsby Jon Griffiths · 7cb95d4a · Sep 29, 2025 · 1 fileMessage 73 · AdequateTriage 0Details
Commit message · Jon Griffiths

qr: display the parent activity help when showing qr display options

Previously this would show help for blkstrm.com/scanjade - which is not
useful when the user is displaying (and not scanning) a qrcode.

Instead, show the help associated with the parent activity where the
options button was selected from.

73/100 · AdequateMessage clarity
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context