Decentralize Signer Registration

[rezabaram]

Why

In order to have multiple aggregator running on a Mithril network, we need a signer registration mechanism which:

• allows the liveness of the protocol (at least one certificate must be produced at each epoch)
• can be centralized, decentralized or in between
• can have a cost for SPOs or not
• can allow the protocol to be fully or partially censorship resistant

The evaluation of the possible implementations associated with their difficulty and expected duration of implementation, security guarantees, difficulty to operate by the SPOs, and eventual impact on the Cardano chain will help us determine clear roadmap and path to move forward to a more decentralized Mithril network able to run with multiple aggregators.

What