Polkadot CC1 v0.8.15

Upgrade priority: Medium (timely update recommended) - due to change(s): Make signature batching use specialized methods (paritytech/substrate#6616)

PLEASE NOTE: This is a pre-release; Kusama nodes encouraged to upgrade. Polkadot nodes may wish to wait 2-3 days.

Native runtimes:

• Polkadot: 15
• Kusama: 2015
• Westend: 35

This release was built with the following versions of rustc. Other versions may work.

• rustc 1.44.1 (c7087fe00 2020-06-17)
• rustc 1.46.0-nightly (9d09331e0 2020-07-12)

Changes

• Medium *: Enable authority discovery by default (#1395)

Client

• Update substrate-networking Grafana dashboard (paritytech/substrate#6649)

Runtime

• Pallet for Purchase in Polkadot (#1369)
• Define BurnDestination, Kusama Treasury burns to Society (#6671) (#1421)
• Medium Enable Polkadot council elections (#1422)
• Treasury burning can be directed (paritytech/substrate#6671)
• Medium identity: Don't let subs be re-registered (paritytech/substrate#6667)
• Regression test to ensure we don't break deterministic builds in wasm (paritytech/substrate#6597)
• allow to specify schedule time as a relative value (paritytech/substrate#6578)
• Medium Make signature batching use specialized methods (paritytech/substrate#6616)