Make the Bazo Blockchain truly permissionless

[rmnblm]

Hey there Bazorians, Bazonians, Bazingos or whatever we call ourselves 👋

I've been working hard the past week to make this PR reality, but here it is:
This PR will make the Bazo blockchain truly permissionless.

What does truly permissionless mean?

Well, a (single) root account still exists (I didn't say truly decentralized, but truly permissionless) but is only able to change configurations in the network (by sending a ConfigTx). What's new is that accounts now can simply join the network. No need for a root to create an account in the network.

Furthermore, if user A wants to transfer coins to user B that does not exist yet, the account will be created automatically. Caution: You can now send coins to accounts where nobody is in possession of the private key (yet).

Starting a miner also has become even more simpler because miners do not need the wallet address or the commitment key of the root. Instead, a new struct Genesis is being introduced. This struct contains the root's wallet address and commitment public key.

type Genesis struct {
 	RootAddress [64]byte
 	RootCommitment [256]byte
 }

The genesis is created by the first miner of the network. The previous hash prevHash of the initial block with height h = 0 is the hash of the genesis.

initialBlock.prevHash = genesis.Hash()

Once a second miner joins the network, it makes a genesis request to a random peer which then responds with the genesis.

Further improvements

The CLI now is even easier than before, you can start a miner A (as root) with the following command:

./bazo-miner start --dataDir NodeA --address localhost:8000 --bootstrap localhost:8000

This will create a directory NodeA containing all required keys and databases.
Starting a second miner B is also easy:

./bazo-miner start --dataDir NodeB --address localhost:8001 --bootstrap localhost:8000

Note that miner B still must have sufficient funds and be part of the validator set in order to start mining. You can read more about the setup of two miners here.

Other mentionable changes:

• Accounts with balance 0 are deleted
• Everything related to multisig is deleted
• Added more tests

Enjoy black friday and see you next week at the Bazo workshop 🖤

Roman