The Hedera services codebase is officially open source and can be found in the official GitHub repository: https://github.com/hashgraph/hedera-services You can read more about the open sourcing of Hedera services in this blog posting: https://www.hedera.com/blog/all-our-services-are-belong-to-you 

The hashgraph platform is available as open review and has been audited by multiple code audit firms. The results of these audits are expected to be made available in late Q4 2020. Open review ensures the source code is made available for anyone to read, recompile, and verify that it is correct. For more information regarding open review of the hashgraph source code, please read Dr. Leemon Baird’s blog posting on Hedera.com.

The nodes that the Council members run will have no special role in consensus - their influence, like all others, will be weighted only by their stake of hbars.

In addition, the Hedera network is fair because there is no leader or miner given special permissions for determining the consensus timestamp assigned to a transaction. Instead, the consensus timestamps for transactions are calculated via a voting process in which the nodes collectively and democratically establish the consensus. The network is fundamentally fair because no individual can stop a transaction from entering the system, or even delay it very much. If one (or a few) malicious nodes attempt to prevent a given transaction from being delivered to the rest of the nodes, and so be added into consensus, then the random nature