My UI uses your bridge to transfer SOL on Solana Devnet to Base Sepolia. In constructing this transaction, the bridge program on the Solana side expects a gas fee receiver address, but it's not clear what it's expecting.
Through trial and error, I found the expected gas fee receiver address for your Solana bridge program is BEwzVVw44VLaspWByUML23hbQmo5ndM1NPQAJsvCxC6F. This address also shows up in Solana Explorer for completed bridge transactions, in addition to the bridge program's Solana address of 83hN2esneZUbKgLfUvo7uzas4g7kyiodeNKAqZgx5MbH.
Would suggest documenting the expected gas fee receiver address!