Polkadot v1.24.0 stable2606

[UnArbosSix]

Motivation

Upgrade Subtensor from the previous RaoFoundation Polkadot SDK revision to the Polkadot v1.24.0 stable2606 revision, keeping the node, runtime, pallets, SDK, and vendored Frontier integration compatible with the updated APIs.

Changes

• Updated workspace Polkadot SDK dependencies and regenerated the root and Frontier lockfiles.
• Updated the Rust toolchain for stable2606.
• Adapted Aura/BABE consensus import and verifier construction to the new SDK interfaces.
• Updated runtime APIs for lazy blocks and the revised session-key generation interface.
• Adapted transaction-fee handling to the new credit API.
• Updated shielded-extrinsic inspection to use ExtrinsicCall while retaining signature validation.
• Migrated hashing and debug derives to their current SDK locations/names.
• Applied compatibility updates across pallets, precompiles, tests, and the Rust SDK.
• Removed the obsolete 60,000-page executor heap override because stable2606 interprets it as additional pages.

Files of interest

• Cargo.toml, Cargo.lock, rust-toolchain.toml
• node/src/consensus/
• node/src/command.rs
• runtime/src/lib.rs
• pallets/shield/src/lib.rs
• pallets/transaction-fee/src/lib.rs
• vendor/frontier/

Behavioral impact

This is primarily an SDK compatibility upgrade. Consensus initialization and block import use the stable2606 APIs, runtime execution accepts lazy blocks, and nodes retain the SDK’s default heap strategy. No intentional change to Subtensor economic policy or extrinsic semantics is introduced.

Runtime and migration implications

The runtime code and dependencies change, so the runtime spec_version is bumped from 432 to 433. No storage migration is introduced.

Validation

The complete repository CI suite, including formatting, compilation, pallet/runtime tests, and runtime build checks, should pass before merge.

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Project	Deployment	Actions	Updated (UTC)
subtensor	Ready	Preview, Comment	Jul 18, 2026 4:07am

[github-actions]

eco-tests changed — indexer review required

This PR modifies files under eco-tests/. and may affect downstream indexing.
cc @evgeny-s — please review manually

Changed files

• eco-tests/Cargo.toml
• eco-tests/src/mock.rs

[github-actions]

🛡️ AI Review — Skeptic (security review)

VERDICT: SAFE

VERY HIGH scrutiny: 16-day-old account with 0 public repos, mitigated by repository write access, corporate commit identity, and no Gittensor association; polkadot-v1.24.0 → main.

Static analysis covered the commit-pinned Polkadot SDK upgrade, lockfiles and toolchain, runtime and consensus adaptations, drand authorization, shielded-extrinsic validation, transaction-fee handling, and vendored Frontier. The runtime specification version is bumped, and no protected review-control files were modified.

Findings

No findings.

Conclusion

The changes remain consistent with the stated SDK upgrade. No concrete security vulnerability or malicious behavior was found.

---

🔍 AI Review — Auditor (domain review)

VERDICT: 👍

UNKNOWN Gittensor association; author has repository write access but a very new account, so this broad SDK upgrade received heightened scrutiny.

The stable2606 compatibility changes are coherent across consensus wiring, authorized drand transactions, lazy-block runtime APIs, transaction-fee credits, shielded-extrinsic inspection, and vendored Frontier. The runtime spec_version is bumped from 432 to 433, and git diff --check passes.

The overlapping PRs concern unrelated features or fixes despite sharing common files. No auto-fix was needed.

Findings

No findings.

Conclusion

No substantive domain issue was identified. Given the breadth of the dependency upgrade, the complete repository CI suite should pass before merge.

[github-actions]

🔄 AI review updated — Skeptic: SAFE Auditor: 👍

[github-actions]

🔄 AI review updated — Skeptic: SAFE Auditor: 👍

[github-actions]

🔄 AI review updated — Skeptic: SAFE Auditor: 👍

[github-actions]

🔄 AI review updated — Skeptic: SAFE Auditor: 👍

[github-actions]

🔄 AI review updated — Skeptic: SAFE Auditor: 👍

[github-actions]

🔄 AI review updated — Skeptic: SAFE Auditor: 👍