Solana’s plan for fairer trades stalls as block producers still choose which orders get in

A proposed Solana rule would let validators reject a block when transactions inside one entry batch are recorded out of fee-priority order. It would not decide which transactions make the block. The SIMD-0649 pull request closed on Sept. 25 without merging, leaving that narrower trade-off for further discussion rather than putting a new ordering rule into effect.The distinction matters to traders trying to predict where an order will land. Under the draft, a block producer, known as the leader, would still choose which transactions to include and how to divide them into batches. The proposed consensus check would make the order of transactions within each completed batch inspectable and enforceable. It would not establish one priority queue for an entire slot.Solana's ledger groups entries into batches. In the draft's design, non-exempt transactions in each batch would have to appear in non-increasing priority order. A validator replaying the block would compare their recorded priorities and treat a violation as an invalid block. It would not reshuffle transactions into the right sequence after receiving them. Equal-priority transactions could appear in either order, and simple vot...