Firmament uses the Ethereum Blockchain

Based on OST.com

Firmament is all about rewarding constructive bahaviour and employee trust and not about rewarding hacks to internal databases. To ensure the integrity of all the transactions in your internal rewards system Firmament is based on a Blockchain. A blockchain makes it impossible to manipulate historical data. When someone sends a reward to their peers the transaction can never be reversed.
Firmament runs on your own branded economy, brought to you by OST.com.

Firmament has not been released yet. You can actively participate in its Development though. If you want to know more or check the status of the project, join our Slack channel.