Polkadot v0.9.15

Upgrade Priority: Medium
This release contains some runtime cleanup and migrations to prepare for the next runtime upgrade. It should be upgraded asap to prepare for the next runtime.

This is runtime only release and upgrading the nodes is not mandatory.

Native runtimes

• Polkadot: 9150
• Kusama: 9150
• Westend: 9150

This release was tested against the following versions of rustc. Other versions may work.

• rustc 1.57.0 (f1edd0429 2021-11-29)
• rustc 1.58.0-nightly (46b8e7488 2021-11-07)

WASM runtimes built with srtool v0.9.19 using rustc 1.57.0 (f1edd0429 2021-11-29).

Proposal hashes:

• polkadot_runtime-v9150.compact.compressed.wasm: 0x960d3ad3f42eb41ab2131e1561dd8cc20f87585e37d2d1b02525578204f11d4b
• kusama_runtime-v9150.compact.compressed.wasm: 0x0bc6607f0fc616102a4144621717d186f72b5864fd67879343461cf691a04c91

Runtime

• ⏳ pending non-critical audit Fix order of hook execution (paritytech/substrate#10043)

Runtime migrations

• ⏳ pending non-critical audit Fix locked deposit of council voters (#4655)
• ⏳ pending non-critical audit Fix locked deposits of Nicks pallet (#4656)