(WIP) mmn blacklist

[linh-nguyenbao]

We can implement 2 types of blacklist

• mempool blacklist: only blacklist the wallet from grpc or json-grpc
• node blacklist: blacklist wallet all network
• for now run with 1 node we can only implement mempool blacklist.
  if we want implement blacklist with multiple nodes in next phase we can implement a blacklist topic then notify spam for all node and add that wallet to mempool blacklist of all nodes.

should we vote fail for transaction in P2P for blacklisted wallet?

• no it still a correct transaction if it not spam
  #353

Reseach for all nodes blacklist

who can add blacklist for all node

• we can have a verify logic like: if that wallet in mempool blacklist of > 1 or all nodes / 2 nodes, we will blacklist that wallet for all nodes

[hoangdohuy]

should discuss with team about high-level solution first