Unfair distribution of fees on fee-market.

[hujw77]

Fee distribution on fee-market

Message settle on time

• 60% assigned relayer
• 32% delivery relayer
• 8% comfirm relayer

Message settle relay late

• 80% delivery relayer
• 20% comfirm relayer

Suppose a message wants to be delivered from ETH to Darwinia. However darwinia's fee is negligible. If an opportunistic relayer could only do receive_messages_proof on Darwinia side and always get the 32% fee on time or 80% fee late.

Solution

• 100% fee to assigned relayer when message settle on time
• ?% (fee + slash) to confirm relayer ?% (fee + slash) to delivery relayer when message settle late

[hackfisher]

Related: https://github.com/darwinia-network/research/issues/28