sqv - OpenPGP signature verification
sqv 1.0.0 sqv is a command-line OpenPGP signature verification
    tool.
  
  - sqv [FLAGS] [OPTIONS] <SIG-FILE> <FILE> --keyring
      <FILE>...
  - --keyring
    <FILE>...
- A keyring. Can be given multiple times.
- --not-after
    <TIMESTAMP>
- Consider signatures created after TIMESTAMP as invalid. If a date is
      given, 23:59:59 is used for the time. [default: now]
- --not-before
    <TIMESTAMP>
- Consider signatures created before TIMESTAMP as invalid. If a date is
      given, 00:00:00 is used for the time. [default: no constraint]
- -n, --signatures
    <N>
- The number of valid signatures to return success. Default: 1
  - <SIG-FILE>
- File containing the detached signature.
- <FILE>
- File to verify.
TIMESTAMPs must be given in ISO 8601 format (e.g.
    '2017-03-04T13:25:35Z', '2017-03-04T13:25', '20170304T1325+0830',
    '2017-03-04', '2017031', ...). If no timezone is specified, UTC is
  assumed.