ethcore: mcip3 block reward contract

[andresilva]

Merge only after #9603.

Implements the Musicoin block reward logic in a contract using blockRewardContractCode. The contract and instructions on how to build can be found at https://gist.github.com/andresilva/6f2afaf9486732a0797f4bdeae018ee9. I have successfully synced the musicoin chain using this contract but would appreciate it if someone else could try as well.

[ghost]

@andresilva @sorpaas Thanks 👍

[ghost]

@sorpaas @andresilva Hello may I ask it is possible to implement this contract with block height counts? We have two hardfork exists and we need to change the block reward at the specific height

[ghost]

It will be great when we have transition height inside contract

[andresilva]

@eosclassicteam The contract has access to the block number so the transitions should be implemented inside the contract.

if (block.number > 1000) {
  // new reward logic
} else {
  ...
}

[ghost]

@andresilva Thanks, also I would like to suggest changing ECIP-1017 to contract 😄

[ascjones]

Tested a sync of the musicoin chain

[ascjones]

@andresilva I think you need to merge latest CI changes

[andresilva]

I added a comment pointing to the source of the block reward contract. I also removed the mcip6_byz chain spec which seemed to be unused.