Currently the CL is blind to the value of the locally built block and therefore, if configured with a builder, will always propose the remotely built block.

In order to allow the CL to intelligently decide between using the local or remote block, the EL could provide the value of its block in its response to engine_getPayload. The EL can be free to determine the value of its block as it sees fit (summing tx fees, checking feeRecipient balance pre/post execution, etc..).

The change will help to ensure validators propose the highest paying block in general, but more importantly will increase the cost of censorship by builders.