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Solana’s SIMD-0649 fairness rule stalls amid leader control over inclusion

The SIMD-0649 pull request closed on Sept. 25 without merging, leaving the proposed batch-level priority enforcement for further discussion.

Reported · Written up by our desk · Market Structure

A proposed Solana rule, dubbed SIMD-0649, aimed to help make transaction ordering inside ledger batches fairer by flagging cases where transactions within a single batch are recorded out of fee-priority order, according to CryptoSlate. The approach was designed as a validator check, with violations treated as invalid blocks upon replay.

The plan did not change how the leader selects which transactions enter a block, nor did it decide which transactions ultimately get included. Under the draft design described by CryptoSlate, the block producer, called the leader, would still choose transactions and how to divide them into batches.

In the SIMD-0649 pull request, non-exempt transactions within each batch would have to appear in non-increasing priority order, and validators would compare recorded priorities to enforce the rule. CryptoSlate also noted the draft would not establish a single global priority queue for an entire slot, and equal-priority transactions could appear in either order.

CryptoSlate reported that the SIMD-0649 pull request closed on Sept. 25 without merging, meaning the proposed consensus check did not take effect and would require additional discussion before any ordering enforcement changes are introduced.

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