Skip to main content
simd.watch GitHub · Solana RPC Proposals
⌘K SIMD repository
Technical proposal SIMD-0138 Activated

Deprecate legacy vote instructions

by Ashwin Sekar Source updated Apr 29, 2025

  1. Idea
  2. Draft
  3. Review
  4. Accept
  5. Implement
  6. Active
View proposal document ↗
⚠ 1 source or integrity warning(s). Review before acting. ⚠ 1 source observation(s) are not fresh. Each source keeps its own timestamp and status below.

Decision brief

Why this proposal matters

Disables the legacy Vote, UpdateVoteState and CompactUpdateVoteState instruction variants.

Source-backed reading aid · source language: EN

Proposal at a glance

What changes

  • deprecate legacy vote instructions, with key depVvnQ2UysGrhwdiwU42tCadZL8GcBb1i2GYhMopQv
  • enable tower sync vote instruction, with key tSynMCspg4xFiCj1v3TDb4c7crMR5tSBhLz4sF7rrNA
  • UpdateVoteState

Stakeholder map

Who is affected

Builders & client teams Impact unknown

No proposal-specific evidence was found for this group.

Action requirement unknown
Validators & operators Medium impact

deprecate legacy vote instructions, with key depVvnQ2UysGrhwdiwU42tCadZL8GcBb1i2GYhMopQv

Action requirement unknown
Users & stakers Medium impact

Sending transactions that include the mentioned instructions will fail.

Action requirement unknown
Governance & ecosystem Impact unknown

No proposal-specific evidence was found for this group.

Action requirement unknown

Exact source revision

Full proposal document

View proposal document ↗
Source-language document. Technical identifiers and evidence remain unchanged. 0616093b2952

Summary

Disables the legacy Vote, UpdateVoteState and CompactUpdateVoteState instruction variants.

Motivation

These instructions are no longer sent by validator clients. It is cumbersome to support these old vote instructions and ensure parity.

Alternatives Considered

None

New Terminology

None

Detailed Design

When the features:

  • deprecate legacy vote instructions, with key depVvnQ2UysGrhwdiwU42tCadZL8GcBb1i2GYhMopQv
  • enable tower sync vote instruction, with key tSynMCspg4xFiCj1v3TDb4c7crMR5tSBhLz4sF7rrNA

are activated, the following instructions will result in an InvalidInstructionData error:

  • Vote
  • VoteSwitch
  • UpdateVoteState
  • UpdateVoteStateSwitch
  • CompactUpdateVoteState
  • CompactUpdateVoteStateSwitch

Enabling deprecate legacy vote instructions without enable tower sync vote instruction should have no effect.

Impact

Sending transactions that include the mentioned instructions will fail.

Security Considerations

None

Backwards Compatibility

Incompatible

Evidence graph

Related proposals and rollout

One or more sources are unavailable.

Upstream review record

Upstream discussion & review

GitHub review is editorial context, not evidence of on-chain support, voting, or outcome.

PR #138 · merged SIMD-0138: Deprecate legacy vote instructions 6 comments and reviews · Feb 2, 2026
@topointon-jump

Do you mind specifying which feature gate the TowerSync instruction is gated by?

GitHub ↗
@topointon-jump

Minor nit: this isn't really down to the implementation, as feature activations are cluster-wide. If you do mean that each client implementation should explicitly do this check, could you explicitly state that, and specify what happens if this check fails? If not, could you re-word to make it clear that this is the responsibility of the feature activator? Thanks! 🙇

GitHub ↗
@AshwinSekar

updated to be clear on the interaction of these 2 features

GitHub ↗
@ripatel-fd

@jacobcreech @0xSol We have consensus on the Anza & Firedancer side. Suggest we give this SIMD 1 week time for community comments and then merge.

GitHub ↗
@jacobcreech

We have consensus on the Anza & Firedancer side. Suggest we give this SIMD 1 week time for community comments and then merge. Alright, we'll merge on April 18th, 2024 if no other comments against this come up.

GitHub ↗
@lheeger-jump

Merging, no new comments.

GitHub ↗

simd.watch community discussion · SIMD-0138

Powered by Giscus · Sign in with GitHub to comment

Community comments load when this section approaches the viewport.

Provenance

Evidence & technical details

Rollout or chain data, source revisions, freshness and integrity.
2

SIMD

Deployment Status

Document lifecycleActivated
CategoryCore protocol
Devnetactive Epoch 730
Testnetactive Epoch 671
Mainnet-Betaactive Epoch 656
6Uf8S75PVh91MYgPQSHnjRAPQq6an5BDv9vomrCwDqLe

Exact source revision

Sources & integrity

  • Proposal document pinned_commit_blob
    0616093b2952ed6de52c4a27d66aadd11d48d4f9
  • simd-document document · stale · Sep 10, 2026
    0616093b2952ed6de52c4a27d66aadd11d48d4f9

One or more sources are unavailable.