You can verify your download by following these procedures and using these KEYS.
Mynewt's Bluetooth stack is now a separate release with a porting layer that allows it to be easily ported to another OS!
If you are brand new to Mynewt, go to Quick Start. The Newt tool will automatically download the latest release.
If you have already installed the Newt tool but not started any project yet, go to Create Your First Project. The Newt tool will automatically download the latest release.
If you have already installed the Newt tool and started a project that installed a previous version of Apache Mynewt, upgrade using Newt tool:
$ newt upgrade