Solana Proposal to Enforce Fee-Priority Ordering Stalls

A proposed Solana improvement, SIMD-0649, which aimed to allow validators to reject blocks if transactions within an entry batch were not recorded in fee-priority order, closed on September 25 without being merged. The proposal sought to make transaction ordering within batches inspectable and enforceable, though it would not have changed the leader's ability to select which transactions to include in a block. Under the draft, non-exempt transactions would have been required to appear in non-increasing priority order based on a specific reward-to-cost calculation. The initiative remains under discussion as the network continues to rely on current block production methods.