E2ETestKeyManagementService(initialKeys: Set<KeyPair>)
A simple in-memory KMS that doesnt bother saving keys to disk. A real implementation would:
Probably be accessed via the network layer as an internal node service i.e. via a message queue, so it can run on a separate/firewalled service.
Use the protocol framework so requests to fetch keys can be suspended whilst a human signs off on the request.
Use deterministic key derivation.
Possibly have some sort of TREZOR-like two-factor authentication ability
etc