BlackHole 2ch 0.7.1 package and embedded driver fail macOS signature verification

Please Confirm

• I have read the FAQ and Wiki where most common issues can be resolved.
• I have searched Discussions to see if the same question has already been asked.
• This is a bug and not a question about audio routing or configuration, which should be posted in Discussions or asked in our Discord server.

macOS Version

macOS 26 Tahoe

BlackHole Build(s) Affected

• 2 channel
• 16 channel
• 64 channel
• other/custom build

Describe the bug

Hi,

I’m testing BlackHole 2ch as part of a macOS audio-routing technical spike and stopped before installation because both the installer package and the embedded driver fail standard macOS signature verification.

Environment

• BlackHole: 2ch version 0.7.1
• Mac: Apple Silicon MacBook Air
• macOS: 26.5.2, build 25F84
• Package source: https://existential.audio/downloads/BlackHole2ch-0.7.1.pkg
• SHA-256: 57b540f27a3e29c37e310e01bee0fdfab76733087e47f997ef9dccf851400dcf

The checksum matches the currently published package metadata.

Package verification

$ pkgutil --check-signature /private/tmp/BlackHole2ch-0.7.1.pkg
Package "BlackHole2ch-0.7.1.pkg":
   Status: invalid signature

Reproduction Steps

1. Download BlackHole 2ch 0.7.1 from: https://existential.audio/downloads/BlackHole2ch-0.7.1.pkg

2. Verify the downloaded file SHA-256: 57b540f27a3e29c37e310e01bee0fdfab76733087e47f997ef9dccf851400dcf

3. Run: pkgutil --check-signature /private/tmp/BlackHole2ch-0.7.1.pkg

4. Observe: Status: invalid signature

5. Expand the package: pkgutil --expand-full /private/tmp/BlackHole2ch-0.7.1.pkg /private/tmp/blackhole-071-inspect.11q2PN/expanded

6. Verify the embedded driver: codesign --verify --deep --strict --verbose=4 /private/tmp/blackhole-071-inspect.11q2PN/expanded/BlackHole.pkg/Payload/BlackHole2ch.driver

7. Observe: invalid signature (code or signature have been modified) In architecture: arm64

Expected Behavior

The official BlackHole 2ch installer package and its embedded driver should pass standard macOS signature verification without requiring Gatekeeper bypass, reduced system security, or local re-signing.

Screenshots

No response