verify-receipt fails with cryptography.exceptions.InvalidSignature

[SteveLasker]

Running the verify-receipt command generates the following errors:

./scitt-emulator.sh client verify-receipt \
    --claim claim.cose \
    --receipt claim.receipt.cbor \
    --service-parameters workspace/service_parameters.json
Leaf hash: a4a11c989bfece0221c77998c62c2f823da27829be61f9ecfa1a207dd1efd6f7
Root: e5500265c6dabe10b3af1da8ed638d3b7bca81d0fe6759c9049a44f7b9b30f55
Traceback (most recent call last):
  File "/home/steve/go/src/github/user/scitt-api-emulator/venv/bin/scitt-emulator", line 33, in <module>
    sys.exit(load_entry_point('scitt-emulator', 'console_scripts', 'scitt-emulator')())
  File "/home/steve/go/src/github/user/scitt-api-emulator/scitt_emulator/cli.py", line 22, in main
    args.func(args)
  File "/home/steve/go/src/github/user/scitt-api-emulator/scitt_emulator/client.py", line 240, in <lambda>
    func=lambda args: verify_receipt(
  File "/home/steve/go/src/github/user/scitt-api-emulator/scitt_emulator/client.py", line 165, in verify_receipt
    service.verify_receipt(cose_path, receipt_path)
  File "/home/steve/go/src/github/user/scitt-api-emulator/scitt_emulator/scitt.py", line 304, in verify_receipt
    self.verify_receipt_contents(receipt_contents, countersign_tbi)
  File "/home/steve/go/src/github/user/scitt-api-emulator/scitt_emulator/ccf.py", line 171, in verify_receipt_contents
    verify_certificate_is_issued_by(node_cert, service_cert)
  File "/home/steve/go/src/github/user/scitt-api-emulator/scitt_emulator/ccf.py", line 229, in verify_certificate_is_issued_by
    public_key.verify(
  File "/home/steve/go/src/github/user/scitt-api-emulator/venv/lib/python3.10/site-packages/cryptography/hazmat/backends/openssl/ec.py", line 328, in verify
    _ecdsa_sig_verify(self._backend, self, signature, data)
  File "/home/steve/go/src/github/user/scitt-api-emulator/venv/lib/python3.10/site-packages/cryptography/hazmat/backends/openssl/ec.py", line 124, in _ecdsa_sig_verify
    raise InvalidSignature
cryptography.exceptions.InvalidSignature