Solana’s plan for fairer trades stalls as block producers still choose which orders get in
Solana proposal SIMD-0649 would let validators reject blocks whose non-exempt transactions are not ordered by priority score within each batch. It would not control transaction inclusion, ordering across batches, or prevent leaders from favoring their own transactions. A minimum batch size was intended to limit trivial batching, but reviewers questioned whether leaders could still separate competing transactions and requested data on current batch sizes and sensitivity tests. The revised draft also allows replay before a batch is complete, though low-throughput delay remains unmeasured. The pull request closed without merging on Sept. 25, leaving the proposal under discussion. Its practical effect on execution predictability is unclear because available evidence does not show how often competing transactions share a batch or how the rule would change leader behavior.
