Fees on Solana (ETH relay fees) about wormhole HOT 2 CLOSED

Potential designs:

• The user pays a fee on Solana. Once the transfer is successfully proxied to ETH, a new VAA is produced to transfer the fees to the relayer that submitted the tx on ETH. (Complex, expensive, misaligned incentives)
• The user has to pick and pay a proxy on Solana. This requires trust that the relayer will really submit the tx (no checks, complex picking process). This design can be implemented as independent relayer protocol which requires some sort of trust!
• The user has to give an allowance to the ETH bridge to allow spending of WETH to pay for fees. Once the VAA is relayed the bridge will handle the fee payment to the relayer.
• The user submits the VAA on Ethereum because they need an ETH balance anyway to pay for ERC20 transfer fees.

from wormhole.

We will use solution 4. Will take care of this in #7 and #36

from wormhole.