Sign the dist as the last step before creating the archive. Take care not to modify/regenerate dist meta files or the manifest.

Error: Old SIGNATURE detected. Please inform the module author to regenerate SIGNATURE using Module::Signature version 0.82 or newer. gpg: Signature made Fri 23 May 2008 03:41:15 AM JST gpg: using RSA key 770B3C4393B84C15 gpg: Can't check signature: No public key ==> BAD/TAMPERED signature detected! <==