Hi all

As discussed in a few of the last weekly meetings, Bitcoin Core's
macOS code signing certificate expired today.

We are (Greg is ;) in the process of establishing a new threshold
signing scheme that will allow us to handle code signing without any
single point of failure. But until then, releases will be signed as
before, just with a new certificate.

As a matter of record, I used the old code-signing key/certificate to
sign a message containing the pubkey that matches the new
key/certificate. It's attached at the end of this message.

The pkcs7 format is rather clunky, but I wanted to include the current
signing certificate to make verification easier. I'll leave it to the
reader to extract the certificate from a previous release in order to
make sure that they match. It was also in the Core git repo until it
was removed recently.

To verify, you can use something like:
openssl smime -verify -in sig.pkcs7 -inform pem -ignore_critical -purpose any

- "ignore_critical" setting tells openssl to ignore the Apple-specific
critical extensions that it doesn't understand.
- "-purpose any" allows the "purpose == smimesign" check to be
skipped. This would otherwise fail because this certificate is only
authorized to sign code, not arbitrary messages.

By now, the signature will probably fail to validate because the
certificate has expired.

The signed message below is timestamped on the Bitcoin blockchain
using OpenTimestamps. See the attached ots file containing the
timestamp proof. If the attachment gets scrubbed and doesn't make it
to the list, don't be afraid to nag Peter Todd about a mail-friendly
format for these proofs :)

Regards,
Cory

expire.txt.sig:
-----BEGIN PKCS7-----
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-----END PKCS7-----