BP Vote aggregation

[pmjanus]

[Feature] Implement EVM Vote Weight Synchronization for Block Producers

🔄 Description
Create a new action in the system contract that synchronizes block producer vote weights between EVM and native chains, ensuring consistent voting power across both environments.

📋 Key Features

• Read vote aggregates from EVM state for specific block producers
• Compare with locally tracked vote weights on native side
• Calculate and apply vote weight differences when detected
• Maintain a persistent record of EVM vote weights in a dedicated table

🧠 Tasks

• Create new action in system contract to fetch EVM vote weights for a specific BP
• Implement table structure to store EVM vote weights on native side
• Develop logic to compare EVM vs native vote weights and apply differences
• Ensure only significant changes trigger state updates (optimization)
• Add support for off-chain script to periodically call this action
• Implement security measures to ensure only eosio account can modify EVM contract state
• Configure zero gas price for all system contract to EVM transactions
• Add comprehensive documentation for the new feature

🔐 Security Considerations

• Native-to-EVM communications for BP registration/unregistration and decay multiplier updates must only be executable by the eosio account
• The EVM contract should have the system contract address hardcoded for verification
• All transactions from system contract to EVM should have 0 gas price
• Add thorough testing
• Consider audit.

🔄 Flow Example

• Action called for BP with 0 previous EVM votes
• System reads current EVM state showing 10^6 votes after decay
• System adds these votes to the BP's total stake
• System updates the EVM vote weights table with new value
• No action taken if values remain unchanged between calls