Big Picture: Implement system contracts in smart contracts

[andelf]

NOTE: The official Tron foundation's big picture is in reverse! -- Adding more system contracts.😩

The question is, how many system contracts (builtin transaction type) can be implemented using smart contracts?

Easy to conclude that:

Can be implemented in plain smart contract:

• TRC10 related, Assets
• Exchange & Market related (Exchange is deprecated, Market is introduced in 4.1)

Requires a central registry contract

Or a powerful event query API.

• AccountName, AccountId
• TRC10 Issue, to implement "list asset" API

Requires a "System" contract

• Resource model
• Witness, proposal, voting
• ... others

[andelf]

A powerful event API will fit all the query APIs.