diff --git a/cumulus/Cargo.lock b/cumulus/Cargo.lock
index a213c48de8..a3289bfd24 100644
--- a/cumulus/Cargo.lock
+++ b/cumulus/Cargo.lock
@@ -38,7 +38,7 @@ dependencies = [
 
 [[package]]
 name = "ahash"
-version = "0.2.16"
+version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "const-random 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -892,11 +892,11 @@ dependencies = [
 
 [[package]]
 name = "finality-grandpa"
-version = "0.9.0"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
- "hashmap_core 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hashbrown 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -955,7 +955,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "fork-tree"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1189,15 +1189,10 @@ name = "hashbrown"
 version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "ahash 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ahash 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "hashmap_core"
-version = "0.1.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "heapsize"
 version = "0.4.2"
@@ -2743,7 +2738,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "polkadot-availability-store"
 version = "0.6.0"
-source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#4fbfe9f765ea21b2e58e35753b6c870cf4679a1c"
+source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#0795094ae42fdc22203f977ff66ec2fb2686a006"
 dependencies = [
  "kvdb 0.1.0 (git+https://github.com/paritytech/parity-common?rev=616b40150ded71f57f650067fcbc5c99d7c343e6)",
  "kvdb-memorydb 0.1.0 (git+https://github.com/paritytech/parity-common?rev=616b40150ded71f57f650067fcbc5c99d7c343e6)",
@@ -2758,7 +2753,7 @@ dependencies = [
 [[package]]
 name = "polkadot-cli"
 version = "0.6.0"
-source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#4fbfe9f765ea21b2e58e35753b6c870cf4679a1c"
+source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#0795094ae42fdc22203f977ff66ec2fb2686a006"
 dependencies = [
  "exit-future 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2772,7 +2767,7 @@ dependencies = [
 [[package]]
 name = "polkadot-collator"
 version = "0.6.0"
-source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#4fbfe9f765ea21b2e58e35753b6c870cf4679a1c"
+source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#0795094ae42fdc22203f977ff66ec2fb2686a006"
 dependencies = [
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2793,7 +2788,7 @@ dependencies = [
 [[package]]
 name = "polkadot-executor"
 version = "0.6.0"
-source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#4fbfe9f765ea21b2e58e35753b6c870cf4679a1c"
+source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#0795094ae42fdc22203f977ff66ec2fb2686a006"
 dependencies = [
  "polkadot-runtime 0.6.0 (git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch)",
  "substrate-executor 2.0.0 (git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch)",
@@ -2802,7 +2797,7 @@ dependencies = [
 [[package]]
 name = "polkadot-network"
 version = "0.6.0"
-source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#4fbfe9f765ea21b2e58e35753b6c870cf4679a1c"
+source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#0795094ae42fdc22203f977ff66ec2fb2686a006"
 dependencies = [
  "arrayvec 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "exit-future 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2822,7 +2817,7 @@ dependencies = [
 [[package]]
 name = "polkadot-parachain"
 version = "0.6.0"
-source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#4fbfe9f765ea21b2e58e35753b6c870cf4679a1c"
+source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#0795094ae42fdc22203f977ff66ec2fb2686a006"
 dependencies = [
  "derive_more 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2841,7 +2836,7 @@ dependencies = [
 [[package]]
 name = "polkadot-primitives"
 version = "0.6.0"
-source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#4fbfe9f765ea21b2e58e35753b6c870cf4679a1c"
+source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#0795094ae42fdc22203f977ff66ec2fb2686a006"
 dependencies = [
  "bitvec 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2859,7 +2854,7 @@ dependencies = [
 [[package]]
 name = "polkadot-runtime"
 version = "0.6.0"
-source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#4fbfe9f765ea21b2e58e35753b6c870cf4679a1c"
+source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#0795094ae42fdc22203f977ff66ec2fb2686a006"
 dependencies = [
  "bitvec 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2913,7 +2908,7 @@ dependencies = [
 [[package]]
 name = "polkadot-service"
 version = "0.6.0"
-source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#4fbfe9f765ea21b2e58e35753b6c870cf4679a1c"
+source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#0795094ae42fdc22203f977ff66ec2fb2686a006"
 dependencies = [
  "exit-future 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2954,7 +2949,7 @@ dependencies = [
 [[package]]
 name = "polkadot-statement-table"
 version = "0.6.0"
-source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#4fbfe9f765ea21b2e58e35753b6c870cf4679a1c"
+source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#0795094ae42fdc22203f977ff66ec2fb2686a006"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "polkadot-primitives 0.6.0 (git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch)",
@@ -2964,7 +2959,7 @@ dependencies = [
 [[package]]
 name = "polkadot-validation"
 version = "0.6.0"
-source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#4fbfe9f765ea21b2e58e35753b6c870cf4679a1c"
+source = "git+https://github.com/paritytech/polkadot?branch=bkchr-cumulus-branch#0795094ae42fdc22203f977ff66ec2fb2686a006"
 dependencies = [
  "bitvec 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "derive_more 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3747,7 +3742,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "sr-api-macros"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro-crate 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3759,7 +3754,7 @@ dependencies = [
 [[package]]
 name = "sr-arithmetic"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "integer-sqrt 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3771,7 +3766,7 @@ dependencies = [
 [[package]]
 name = "sr-io"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "hash-db 0.15.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libsecp256k1 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3788,7 +3783,7 @@ dependencies = [
 [[package]]
 name = "sr-primitives"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "impl-trait-for-tuples 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3806,7 +3801,7 @@ dependencies = [
 [[package]]
 name = "sr-staking-primitives"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-primitives 2.0.0 (git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch)",
@@ -3816,7 +3811,7 @@ dependencies = [
 [[package]]
 name = "sr-std"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -3824,7 +3819,7 @@ dependencies = [
 [[package]]
 name = "sr-version"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "impl-serde 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3836,7 +3831,7 @@ dependencies = [
 [[package]]
 name = "srml-authority-discovery"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3853,7 +3848,7 @@ dependencies = [
 [[package]]
 name = "srml-authorship"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "impl-trait-for-tuples 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3869,7 +3864,7 @@ dependencies = [
 [[package]]
 name = "srml-babe"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "hex-literal 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3889,7 +3884,7 @@ dependencies = [
 [[package]]
 name = "srml-balances"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3904,7 +3899,7 @@ dependencies = [
 [[package]]
 name = "srml-collective"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3920,7 +3915,7 @@ dependencies = [
 [[package]]
 name = "srml-democracy"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3935,7 +3930,7 @@ dependencies = [
 [[package]]
 name = "srml-elections"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3951,7 +3946,7 @@ dependencies = [
 [[package]]
 name = "srml-executive"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3965,7 +3960,7 @@ dependencies = [
 [[package]]
 name = "srml-finality-tracker"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "impl-trait-for-tuples 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3980,7 +3975,7 @@ dependencies = [
 [[package]]
 name = "srml-grandpa"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3998,7 +3993,7 @@ dependencies = [
 [[package]]
 name = "srml-im-online"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4016,7 +4011,7 @@ dependencies = [
 [[package]]
 name = "srml-indices"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4033,7 +4028,7 @@ dependencies = [
 [[package]]
 name = "srml-membership"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4047,7 +4042,7 @@ dependencies = [
 [[package]]
 name = "srml-metadata"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4058,7 +4053,7 @@ dependencies = [
 [[package]]
 name = "srml-offences"
 version = "1.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4073,7 +4068,7 @@ dependencies = [
 [[package]]
 name = "srml-randomness-collective-flip"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4086,7 +4081,7 @@ dependencies = [
 [[package]]
 name = "srml-session"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "impl-trait-for-tuples 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4105,7 +4100,7 @@ dependencies = [
 [[package]]
 name = "srml-staking"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4125,7 +4120,7 @@ dependencies = [
 [[package]]
 name = "srml-staking-reward-curve"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "proc-macro-crate 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4136,7 +4131,7 @@ dependencies = [
 [[package]]
 name = "srml-sudo"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4150,7 +4145,7 @@ dependencies = [
 [[package]]
 name = "srml-support"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "bitmask 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "impl-trait-for-tuples 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4170,7 +4165,7 @@ dependencies = [
 [[package]]
 name = "srml-support-procedural"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4182,7 +4177,7 @@ dependencies = [
 [[package]]
 name = "srml-support-procedural-tools"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "proc-macro-crate 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4194,7 +4189,7 @@ dependencies = [
 [[package]]
 name = "srml-support-procedural-tools-derive"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4204,7 +4199,7 @@ dependencies = [
 [[package]]
 name = "srml-system"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "impl-trait-for-tuples 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4221,7 +4216,7 @@ dependencies = [
 [[package]]
 name = "srml-system-rpc-runtime-api"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "substrate-client 2.0.0 (git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch)",
@@ -4230,7 +4225,7 @@ dependencies = [
 [[package]]
 name = "srml-timestamp"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "impl-trait-for-tuples 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4245,7 +4240,7 @@ dependencies = [
 [[package]]
 name = "srml-transaction-payment"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-primitives 2.0.0 (git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch)",
@@ -4257,7 +4252,7 @@ dependencies = [
 [[package]]
 name = "srml-treasury"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4344,7 +4339,7 @@ dependencies = [
 [[package]]
 name = "substrate-application-crypto"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4356,7 +4351,7 @@ dependencies = [
 [[package]]
 name = "substrate-authority-discovery"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "derive_more 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4378,7 +4373,7 @@ dependencies = [
 [[package]]
 name = "substrate-authority-discovery-primitives"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-primitives 2.0.0 (git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch)",
@@ -4389,7 +4384,7 @@ dependencies = [
 [[package]]
 name = "substrate-basic-authorship"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "futures-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4417,7 +4412,7 @@ dependencies = [
 [[package]]
 name = "substrate-chain-spec"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "impl-trait-for-tuples 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4432,7 +4427,7 @@ dependencies = [
 [[package]]
 name = "substrate-chain-spec-derive"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "proc-macro-crate 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4443,7 +4438,7 @@ dependencies = [
 [[package]]
 name = "substrate-cli"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "ansi_term 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "app_dirs 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4479,7 +4474,7 @@ dependencies = [
 [[package]]
 name = "substrate-client"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "derive_more 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4509,7 +4504,7 @@ dependencies = [
 [[package]]
 name = "substrate-client-db"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "hash-db 0.15.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb 0.1.0 (git+https://github.com/paritytech/parity-common?rev=b0317f649ab2c665b7987b8475878fc4d2e1f81d)",
@@ -4533,7 +4528,7 @@ dependencies = [
 [[package]]
 name = "substrate-consensus-aura-primitives"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-primitives 2.0.0 (git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch)",
@@ -4545,7 +4540,7 @@ dependencies = [
 [[package]]
 name = "substrate-consensus-babe"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "derive_more 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fork-tree 2.0.0 (git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch)",
@@ -4583,7 +4578,7 @@ dependencies = [
 [[package]]
 name = "substrate-consensus-babe-primitives"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "parity-scale-codec 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "schnorrkel 0.8.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4597,7 +4592,7 @@ dependencies = [
 [[package]]
 name = "substrate-consensus-common"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "derive_more 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4616,7 +4611,7 @@ dependencies = [
 [[package]]
 name = "substrate-consensus-slots"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "futures-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-timer 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4634,7 +4629,7 @@ dependencies = [
 [[package]]
 name = "substrate-consensus-uncles"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-primitives 2.0.0 (git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch)",
@@ -4648,7 +4643,7 @@ dependencies = [
 [[package]]
 name = "substrate-executor"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "derive_more 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4672,7 +4667,7 @@ dependencies = [
 [[package]]
 name = "substrate-externalities"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
  "environmental 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "primitive-types 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4683,9 +4678,9 @@ dependencies = [
 [[package]]
 name = "substrate-finality-grandpa"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
- "finality-grandpa 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "finality-grandpa 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "fork-tree 2.0.0 (git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch)",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4712,7 +4707,7 @@ dependencies = [
 [[package]]
 name = "substrate-finality-grandpa-primitives"
 version = "2.0.0"
-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
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@@ -4725,7 +4720,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4735,7 +4730,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
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@@ -4746,7 +4741,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4758,7 +4753,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4773,7 +4768,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4815,7 +4810,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4840,7 +4835,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4849,7 +4844,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4858,7 +4853,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4871,7 +4866,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4880,7 +4875,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4915,7 +4910,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4925,7 +4920,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4951,7 +4946,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4973,7 +4968,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4982,7 +4977,7 @@ dependencies = [
 [[package]]
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -4997,7 +4992,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -5006,7 +5001,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -5048,7 +5043,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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 dependencies = [
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@@ -5059,7 +5054,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -5070,7 +5065,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
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@@ -5089,7 +5084,7 @@ dependencies = [
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@@ -5111,7 +5106,7 @@ dependencies = [
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@@ -5129,7 +5124,7 @@ dependencies = [
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@@ -5163,7 +5158,7 @@ dependencies = [
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@@ -5193,7 +5188,7 @@ dependencies = [
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@@ -5207,7 +5202,7 @@ dependencies = [
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 
 [[package]]
 name = "substrate-wasm-builder-runner"
@@ -5217,7 +5212,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
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-source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#8977386d4a0b8337e21814d49a556c0d439ed4fd"
+source = "git+https://github.com/paritytech/substrate?branch=bkchr-cumulus-branch#2866a0d840cf454ebabe8fe96a32c3376d0fc786"
 dependencies = [
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@@ -6159,7 +6154,7 @@ dependencies = [
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 "checksum fixed-hash 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "516877b7b9a1cc2d0293cbce23cd6203f0edbfd4090e6ca4489fecb5aa73050e"
 "checksum fixedbitset 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "86d4de0081402f5e88cdac65c8dcdcc73118c1a7a465e2a05f0da05843a8ea33"
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@@ -6194,7 +6189,6 @@ dependencies = [
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 "checksum hashbrown 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6587d09be37fb98a11cb08b9000a3f592451c1b1b613ca69d949160e313a430a"
-"checksum hashmap_core 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "2d6852e5a86250521973b0c1d39677166d8a9c0047c908d7e04f1aa04177973c"
 "checksum heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1679e6ea370dee694f91f1dc469bf94cf8f52051d147aec3e1f9497c6fc22461"
 "checksum heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
 "checksum hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
diff --git a/cumulus/runtime/src/validate_block/implementation.rs b/cumulus/runtime/src/validate_block/implementation.rs
index d5dde214d5..b9bd4fa039 100644
--- a/cumulus/runtime/src/validate_block/implementation.rs
+++ b/cumulus/runtime/src/validate_block/implementation.rs
@@ -27,7 +27,7 @@ use rstd::{slice, ptr, cmp, vec::Vec, boxed::Box, mem};
 
 use hash_db::{HashDB, EMPTY_PREFIX};
 
-use parachain::ValidationParams;
+use parachain::{ValidationParams, ValidationResult};
 
 static mut STORAGE: Option<Box<dyn Storage>> = None;
 /// The message to use as expect message while accessing the `STORAGE`.
@@ -54,13 +54,15 @@ trait Storage {
 #[doc(hidden)]
 pub fn validate_block<B: BlockT<Hash = H256>, E: ExecuteBlock<B>>(
 	params: ValidationParams,
-) {
-	use codec::Decode;
+) -> ValidationResult {
+	use codec::{Decode, Encode};
 
 	let block_data = crate::ParachainBlockData::<B>::decode(&mut &params.block_data[..])
 		.expect("Invalid parachain block data");
 
 	let parent_head = B::Header::decode(&mut &params.parent_head[..]).expect("Invalid parent head");
+	// TODO: Use correct head data
+	let head_data = block_data.header.encode();
 
 	// TODO: Add `PolkadotInherent`.
 	let block = B::new(block_data.header, block_data.extrinsics);
@@ -85,6 +87,8 @@ pub fn validate_block<B: BlockT<Hash = H256>, E: ExecuteBlock<B>>(
 	};
 
 	E::execute_block(block);
+
+	ValidationResult { head_data }
 }
 
 /// The storage implementation used when validating a block that is using the
diff --git a/cumulus/runtime/src/validate_block/mod.rs b/cumulus/runtime/src/validate_block/mod.rs
index 1d23ed9046..4d6961ac98 100644
--- a/cumulus/runtime/src/validate_block/mod.rs
+++ b/cumulus/runtime/src/validate_block/mod.rs
@@ -69,12 +69,11 @@ macro_rules! register_validate_block_impl {
 					arguments_len,
 				);
 
-				$crate::validate_block::implementation::validate_block::<
+				let res = $crate::validate_block::implementation::validate_block::<
 					$block, $block_executor
 				>(params);
 
-				// We don't return anything for now.
-				0
+				$crate::validate_block::parachain::wasm_api::write_result(res)
 			}
 		}
 	};