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 Sat 28 Mar 2015 03:18:19 AM JST gpg: using DSA key 84C1C77BC0B10A5B gpg: Can't check signature: No public key ==> BAD/TAMPERED signature detected! <==