SIMD-0607 Must Merge Before Solana's Disinflation Rate Can Activate, Anza Says

SGP-0002 cleared the two-thirds approval threshold at 67.001% on August 28, a result covered in our earlier reporting. Roughly 80 minutes after that piece published, Anza Anza posted a seven-tweet thread walking through what the approval actually sets in motion. The thread identified something the vote result alone could not: the disinflation rate has not changed, and one more implementation step must clear before it can.

Why the Feature Gate Cannot Be Scheduled Yet

SIMD-0550 implements the doubled disinflation taper through a single permanent feature gate. When the gate activates at an epoch boundary, every validator on the network recomputes staking rewards under the new 0.30 taper rather than the current 0.15. Epoch rewards up to the boundary use the prior schedule; everything after uses the faster one.

That activation step has a firm prerequisite. Agave and Firedancer Firedancer, the two production validator clients on Solana mainnet, must produce bit-for-bit identical results for every staking reward calculation. Reward outputs feed into bank hashes, which validators use to reach consensus on chain state. Any divergence in reward math is a consensus failure.

Floating-point arithmetic cannot provide this guarantee. The same operation can return different binary outputs across different hardware and compilers, even when both clients implement the same formula. Anza stated the sequencing directly in its thread: "The implementation of SIMD-0550 is a single permanent feature gate that sets the taper to 0.30. One prerequisite is in review, then the gate can be scheduled."

SIMD-0607: Deterministic Integer Math for Staking Rewards

That prerequisite is SIMD-0607, a pull request currently open and awaiting sign-off from at least one representative from each of the Anza and Firedancer teams. It replaces floating-point arithmetic in Solana's staking reward calculations with deterministic integer (fixed-point) math. With both clients committed to the same integer operations, outputs are identical regardless of underlying hardware.

The SIMD-0607 specification recommends activating the integer math change before or at the same epoch boundary as the disinflation rate change, so both transitions happen without requiring clients to reconcile different calculation anchors across history. The implementation sequence is: SIMD-0607 merges, ships in Agave v4.4, feature gates for both SIMDs are scheduled, and the disinflation rate changes at an epoch boundary. No timeline has been given for Agave v4.4's release.

What the Three Proposals Settled

Anza's thread also summarized the standing of all three SGPs after the final tally.

SGP-0002, now approved, doubles the annual disinflation taper from 15% to 30%. The terminal SOL inflation rate of 1.5% arrives in 2029 rather than 2032, reducing total SOL issuance by approximately 18.9 million tokens over six years, according to Anza.

The Solana Constitution (SGP-0001) was also ratified, establishing stake-weighted voting as the formal decision-making process for network changes. Validators vote with active stake; delegators can directly override their validator's vote on any proposal, a mechanism that saw use during the SGP-0002 vote itself.

The resource and inclusion fee restructuring (SGP-0003) did not clear the supermajority threshold. The proposal would have split the base transaction fee into a flat inclusion fee for block leaders and a resource fee scaling with compute usage. Most non-participating stake abstained rather than voted against the measure.