This improvement proposal add an option to JSON-RPC filter options (used by eth_newFilter and eth_getLogs ) that allows specifying the block hash that should be included in the results. This option would be an alternative to fromBlock / toBlock options. This resolves some issues that make it difficult/expensive to author robust clients due to the nature of chain reorgs, unreliable network connections and the result set not containing enough details in the empty case.
Since many DEFI protocols use it due to reasons such as those specified by the EIP-234 itself, it would be good to have it available in RSK and thus be able to migrate protocols from other chains in a simple and fully compatible way.