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title: "Bridge: make some headers submissions free"
doc:
- audience: Runtime Dev
description: |
Adds `FreeHeadersInterval` configuration constant to the `pallet_bridge_grandpa`.
Transactions that improve best known header by at least `FreeHeadersInterval` headers
are now free for the submitter. Additionally, we allow single free parachain header
update per every free relay chain header. Bridge signed extensions are adjusted
to support that new scheme. Bridge runtime APIs are extended to support that new
scheme. Bridge fees are decreased by ~98% because now they do not include cost of
finality submissions - we assume relayers will be submitting finality transactions
for free.
crates:
- name: bridge-runtime-common
bump: major
- name: bp-bridge-hub-cumulus
bump: patch
- name: bp-bridge-hub-kusama
bump: major
- name: bp-bridge-hub-polkadot
bump: major
- name: bp-bridge-hub-rococo
bump: major
- name: bp-bridge-hub-westend
bump: major
- name: pallet-bridge-grandpa
bump: major
- name: pallet-bridge-parachains
bump: major
- name: bp-parachains
bump: major
- name: bp-runtime
bump: major
- name: relay-substrate-client
bump: major
- name: bridge-hub-rococo-runtime
bump: major
- name: bridge-hub-westend-runtime
bump: major
- name: bridge-hub-test-utils
bump: minor