diff --git a/Cargo.lock b/Cargo.lock
index 166030887edb..fa776fa6c41b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -786,7 +786,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "fork-tree"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2174,12 +2174,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "polkadot"
-version = "0.3.19"
+version = "0.3.20"
 dependencies = [
  "ctrlc 1.1.1 (git+https://github.com/paritytech/rust-ctrlc.git)",
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "polkadot-cli 0.3.19",
+ "polkadot-cli 0.3.20",
  "vergen 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2200,12 +2200,12 @@ dependencies = [
 
 [[package]]
 name = "polkadot-cli"
-version = "0.3.19"
+version = "0.3.20"
 dependencies = [
  "exit-future 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "polkadot-service 0.3.19",
+ "polkadot-service 0.3.20",
  "substrate-cli 0.3.0 (git+https://github.com/paritytech/substrate)",
  "tokio 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2217,7 +2217,7 @@ dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "polkadot-cli 0.3.19",
+ "polkadot-cli 0.3.20",
  "polkadot-primitives 0.1.0",
  "polkadot-runtime 0.1.0",
  "substrate-client 0.1.0 (git+https://github.com/paritytech/substrate)",
@@ -2349,13 +2349,14 @@ dependencies = [
  "substrate-consensus-aura-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-inherents 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-keyring 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-offchain-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-serializer 0.1.0 (git+https://github.com/paritytech/substrate)",
 ]
 
 [[package]]
 name = "polkadot-service"
-version = "0.3.19"
+version = "0.3.20"
 dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3001,7 +3002,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "sr-api-macros"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro-crate 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3013,7 +3014,7 @@ dependencies = [
 [[package]]
 name = "sr-io"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "environmental 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hash-db 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3030,7 +3031,7 @@ dependencies = [
 [[package]]
 name = "sr-primitives"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "integer-sqrt 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3046,7 +3047,7 @@ dependencies = [
 [[package]]
 name = "sr-std"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -3054,7 +3055,7 @@ dependencies = [
 [[package]]
 name = "sr-version"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "impl-serde 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3067,7 +3068,7 @@ dependencies = [
 [[package]]
 name = "srml-aura"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3086,7 +3087,7 @@ dependencies = [
 [[package]]
 name = "srml-balances"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3102,7 +3103,7 @@ dependencies = [
 [[package]]
 name = "srml-consensus"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3119,7 +3120,7 @@ dependencies = [
 [[package]]
 name = "srml-council"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec-derive 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3137,7 +3138,7 @@ dependencies = [
 [[package]]
 name = "srml-democracy"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3154,7 +3155,7 @@ dependencies = [
 [[package]]
 name = "srml-executive"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3168,7 +3169,7 @@ dependencies = [
 [[package]]
 name = "srml-finality-tracker"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3184,7 +3185,7 @@ dependencies = [
 [[package]]
 name = "srml-grandpa"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3203,7 +3204,7 @@ dependencies = [
 [[package]]
 name = "srml-indices"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3222,7 +3223,7 @@ dependencies = [
 [[package]]
 name = "srml-metadata"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3234,7 +3235,7 @@ dependencies = [
 [[package]]
 name = "srml-session"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3252,7 +3253,7 @@ dependencies = [
 [[package]]
 name = "srml-staking"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3271,7 +3272,7 @@ dependencies = [
 [[package]]
 name = "srml-sudo"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3287,7 +3288,7 @@ dependencies = [
 [[package]]
 name = "srml-support"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "bitmask 0.5.0 (git+https://github.com/paritytech/bitmask)",
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3307,7 +3308,7 @@ dependencies = [
 [[package]]
 name = "srml-support-procedural"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3319,7 +3320,7 @@ dependencies = [
 [[package]]
 name = "srml-support-procedural-tools"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "proc-macro-crate 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3331,7 +3332,7 @@ dependencies = [
 [[package]]
 name = "srml-support-procedural-tools-derive"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3341,7 +3342,7 @@ dependencies = [
 [[package]]
 name = "srml-system"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3358,7 +3359,7 @@ dependencies = [
 [[package]]
 name = "srml-timestamp"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3373,7 +3374,7 @@ dependencies = [
 [[package]]
 name = "srml-treasury"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3513,7 +3514,7 @@ dependencies = [
 [[package]]
 name = "substrate-cli"
 version = "0.3.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "app_dirs 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3547,7 +3548,7 @@ dependencies = [
 [[package]]
 name = "substrate-client"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3576,7 +3577,7 @@ dependencies = [
 [[package]]
 name = "substrate-client-db"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hash-db 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb 0.1.0 (git+https://github.com/paritytech/parity-common?rev=b0317f649ab2c665b7987b8475878fc4d2e1f81d)",
@@ -3597,7 +3598,7 @@ dependencies = [
 [[package]]
 name = "substrate-consensus-aura"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3623,7 +3624,7 @@ dependencies = [
 [[package]]
 name = "substrate-consensus-aura-primitives"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "substrate-client 0.1.0 (git+https://github.com/paritytech/substrate)",
 ]
@@ -3631,7 +3632,7 @@ dependencies = [
 [[package]]
 name = "substrate-consensus-aura-slots"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3650,7 +3651,7 @@ dependencies = [
 [[package]]
 name = "substrate-consensus-common"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3669,7 +3670,7 @@ dependencies = [
 [[package]]
 name = "substrate-executor"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3694,7 +3695,7 @@ dependencies = [
 [[package]]
 name = "substrate-finality-grandpa"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "finality-grandpa 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fork-tree 0.1.0 (git+https://github.com/paritytech/substrate)",
@@ -3719,7 +3720,7 @@ dependencies = [
 [[package]]
 name = "substrate-finality-grandpa-primitives"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
@@ -3731,7 +3732,7 @@ dependencies = [
 [[package]]
 name = "substrate-inherents"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3742,7 +3743,7 @@ dependencies = [
 [[package]]
 name = "substrate-keyring"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3754,7 +3755,7 @@ dependencies = [
 [[package]]
 name = "substrate-keystore"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3770,7 +3771,7 @@ dependencies = [
 [[package]]
 name = "substrate-network"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3797,7 +3798,7 @@ dependencies = [
 [[package]]
 name = "substrate-network-libp2p"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3821,10 +3822,37 @@ dependencies = [
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "substrate-offchain"
+version = "0.1.0"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
+dependencies = [
+ "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sr-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-client 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-consensus-common 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-inherents 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-offchain-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-transaction-pool 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "tokio 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "substrate-offchain-primitives"
+version = "0.1.0"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
+dependencies = [
+ "sr-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-client 0.1.0 (git+https://github.com/paritytech/substrate)",
+]
+
 [[package]]
 name = "substrate-panic-handler"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "backtrace 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3833,7 +3861,7 @@ dependencies = [
 [[package]]
 name = "substrate-peerset"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3850,7 +3878,7 @@ dependencies = [
 [[package]]
 name = "substrate-primitives"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "base58 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3881,7 +3909,7 @@ dependencies = [
 [[package]]
 name = "substrate-rpc"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-core 10.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3907,7 +3935,7 @@ dependencies = [
 [[package]]
 name = "substrate-rpc-servers"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "jsonrpc-http-server 10.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-pubsub 10.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3921,7 +3949,7 @@ dependencies = [
 [[package]]
 name = "substrate-serializer"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "serde 1.0.89 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3930,7 +3958,7 @@ dependencies = [
 [[package]]
 name = "substrate-service"
 version = "0.3.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "exit-future 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3949,8 +3977,10 @@ dependencies = [
  "substrate-client-db 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-consensus-common 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-executor 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-inherents 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-keystore 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-network 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-offchain 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-rpc-servers 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-telemetry 0.3.1 (git+https://github.com/paritytech/substrate)",
@@ -3962,7 +3992,7 @@ dependencies = [
 [[package]]
 name = "substrate-state-db"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3973,7 +4003,7 @@ dependencies = [
 [[package]]
 name = "substrate-state-machine"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hash-db 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3991,7 +4021,7 @@ dependencies = [
 [[package]]
 name = "substrate-telemetry"
 version = "0.3.1"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4009,7 +4039,7 @@ dependencies = [
 [[package]]
 name = "substrate-transaction-graph"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4023,7 +4053,7 @@ dependencies = [
 [[package]]
 name = "substrate-transaction-pool"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4039,7 +4069,7 @@ dependencies = [
 [[package]]
 name = "substrate-trie"
 version = "0.4.0"
-source = "git+https://github.com/paritytech/substrate#a4204129ddfd2de862b78c1f7392f61e531e41e1"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hash-db 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memory-db 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -5082,6 +5112,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum substrate-keystore 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
 "checksum substrate-network 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
 "checksum substrate-network-libp2p 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
+"checksum substrate-offchain 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
+"checksum substrate-offchain-primitives 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
 "checksum substrate-panic-handler 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
 "checksum substrate-peerset 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
 "checksum substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
diff --git a/Cargo.toml b/Cargo.toml
index 4aa332e6dd53..0b3843c11202 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,7 +4,7 @@ path = "src/main.rs"
 
 [package]
 name = "polkadot"
-version = "0.3.19"
+version = "0.3.20"
 authors = ["Parity Technologies <admin@parity.io>"]
 build = "build.rs"
 
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index 812bf5af7a27..d24aaf032d83 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "polkadot-cli"
-version = "0.3.19"
+version = "0.3.20"
 authors = ["Parity Technologies <admin@parity.io>"]
 description = "Polkadot node implementation in Rust."
 
diff --git a/runtime/Cargo.toml b/runtime/Cargo.toml
index 73a35324b048..b1900380752a 100644
--- a/runtime/Cargo.toml
+++ b/runtime/Cargo.toml
@@ -21,6 +21,7 @@ substrate-inherents = { git = "https://github.com/paritytech/substrate" }
 substrate-primitives = { git = "https://github.com/paritytech/substrate" }
 substrate-client = { git = "https://github.com/paritytech/substrate" }
 substrate-consensus-aura-primitives = { git = "https://github.com/paritytech/substrate", default-features = false }
+substrate-offchain-primitives = { git = "https://github.com/paritytech/substrate", default-features = false }
 srml-aura = { git = "https://github.com/paritytech/substrate" }
 srml-balances = { git = "https://github.com/paritytech/substrate" }
 srml-consensus = { git = "https://github.com/paritytech/substrate" }
@@ -51,6 +52,7 @@ std = [
 	"parity-codec-derive/std",
 	"substrate-inherents/std",
 	"substrate-primitives/std",
+	"substrate-offchain-primitives/std",
 	"sr-std/std",
 	"sr-io/std",
 	"srml-support/std",
diff --git a/runtime/src/lib.rs b/runtime/src/lib.rs
index 470c7e6adf54..dbb69eb25ade 100644
--- a/runtime/src/lib.rs
+++ b/runtime/src/lib.rs
@@ -29,6 +29,7 @@ extern crate parity_codec as codec;
 extern crate substrate_consensus_aura_primitives as consensus_aura;
 extern crate substrate_inherents as inherents;
 extern crate substrate_primitives;
+extern crate substrate_offchain_primitives as offchain_primitives;
 #[macro_use]
 extern crate substrate_client as client;
 
@@ -330,6 +331,12 @@ impl_runtime_apis! {
 		}
 	}
 
+	impl offchain_primitives::OffchainWorkerApi<Block> for Runtime {
+		fn offchain_worker(number: sr_primitives::traits::NumberFor<Block>) {
+			Executive::offchain_worker(number)
+		}
+	}
+
 	impl parachain::ParachainHost<Block> for Runtime {
 		fn validators() -> Vec<parachain::ValidatorId> {
 			Consensus::authorities()  // only possible as long as parachain validator crypto === aura crypto
diff --git a/runtime/wasm/Cargo.lock b/runtime/wasm/Cargo.lock
index f426c355e5dd..3a73e402795c 100644
--- a/runtime/wasm/Cargo.lock
+++ b/runtime/wasm/Cargo.lock
@@ -194,6 +194,7 @@ dependencies = [
  "substrate-client 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-consensus-aura-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-inherents 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-offchain-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
  "substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
 ]
 
@@ -296,7 +297,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "sr-api-macros"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro-crate 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -308,7 +309,7 @@ dependencies = [
 [[package]]
 name = "sr-io"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hash-db 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -320,7 +321,7 @@ dependencies = [
 [[package]]
 name = "sr-primitives"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "integer-sqrt 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -333,7 +334,7 @@ dependencies = [
 [[package]]
 name = "sr-std"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -341,7 +342,7 @@ dependencies = [
 [[package]]
 name = "sr-version"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
@@ -351,7 +352,7 @@ dependencies = [
 [[package]]
 name = "srml-aura"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -369,7 +370,7 @@ dependencies = [
 [[package]]
 name = "srml-balances"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -383,7 +384,7 @@ dependencies = [
 [[package]]
 name = "srml-consensus"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -398,7 +399,7 @@ dependencies = [
 [[package]]
 name = "srml-council"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec-derive 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -415,7 +416,7 @@ dependencies = [
 [[package]]
 name = "srml-democracy"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -430,7 +431,7 @@ dependencies = [
 [[package]]
 name = "srml-executive"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-io 0.1.0 (git+https://github.com/paritytech/substrate)",
@@ -443,7 +444,7 @@ dependencies = [
 [[package]]
 name = "srml-finality-tracker"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -458,7 +459,7 @@ dependencies = [
 [[package]]
 name = "srml-grandpa"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
@@ -475,7 +476,7 @@ dependencies = [
 [[package]]
 name = "srml-indices"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -492,7 +493,7 @@ dependencies = [
 [[package]]
 name = "srml-metadata"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-std 0.1.0 (git+https://github.com/paritytech/substrate)",
@@ -502,7 +503,7 @@ dependencies = [
 [[package]]
 name = "srml-session"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -519,7 +520,7 @@ dependencies = [
 [[package]]
 name = "srml-staking"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -536,7 +537,7 @@ dependencies = [
 [[package]]
 name = "srml-sudo"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -551,7 +552,7 @@ dependencies = [
 [[package]]
 name = "srml-support"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "bitmask 0.5.0 (git+https://github.com/paritytech/bitmask)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -567,7 +568,7 @@ dependencies = [
 [[package]]
 name = "srml-support-procedural"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -579,7 +580,7 @@ dependencies = [
 [[package]]
 name = "srml-support-procedural-tools"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "proc-macro-crate 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -591,7 +592,7 @@ dependencies = [
 [[package]]
 name = "srml-support-procedural-tools-derive"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -601,7 +602,7 @@ dependencies = [
 [[package]]
 name = "srml-system"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -616,7 +617,7 @@ dependencies = [
 [[package]]
 name = "srml-timestamp"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -630,7 +631,7 @@ dependencies = [
 [[package]]
 name = "srml-treasury"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -649,7 +650,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "substrate-client"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-api-macros 0.1.0 (git+https://github.com/paritytech/substrate)",
@@ -663,7 +664,7 @@ dependencies = [
 [[package]]
 name = "substrate-consensus-aura-primitives"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "substrate-client 0.1.0 (git+https://github.com/paritytech/substrate)",
 ]
@@ -671,7 +672,7 @@ dependencies = [
 [[package]]
 name = "substrate-finality-grandpa-primitives"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
@@ -683,17 +684,26 @@ dependencies = [
 [[package]]
 name = "substrate-inherents"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "parity-codec 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
  "sr-std 0.1.0 (git+https://github.com/paritytech/substrate)",
 ]
 
+[[package]]
+name = "substrate-offchain-primitives"
+version = "0.1.0"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
+dependencies = [
+ "sr-primitives 0.1.0 (git+https://github.com/paritytech/substrate)",
+ "substrate-client 0.1.0 (git+https://github.com/paritytech/substrate)",
+]
+
 [[package]]
 name = "substrate-primitives"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/substrate#3628a932187cc53a1a765fab935baea8a84ec1ce"
+source = "git+https://github.com/paritytech/substrate#6afca8217d1219eb4247e720f0e7cffce44a8474"
 dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hash-db 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -802,6 +812,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum substrate-consensus-aura-primitives 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
 "checksum substrate-finality-grandpa-primitives 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
 "checksum substrate-inherents 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
+"checksum substrate-offchain-primitives 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
 "checksum substrate-primitives 0.1.0 (git+https://github.com/paritytech/substrate)" = "<none>"
 "checksum syn 0.15.29 (registry+https://github.com/rust-lang/crates.io-index)" = "1825685f977249735d510a242a6727b46efe914bb67e38d30c071b1b72b1d5c2"
 "checksum toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "758664fc71a3a69038656bee8b6be6477d2a6c315a6b81f7081f591bffa4111f"
diff --git a/runtime/wasm/Cargo.toml b/runtime/wasm/Cargo.toml
index 1fc936988fe8..6ab372ed52b7 100644
--- a/runtime/wasm/Cargo.toml
+++ b/runtime/wasm/Cargo.toml
@@ -17,6 +17,7 @@ substrate-primitives = { git = "https://github.com/paritytech/substrate", defaul
 substrate-client = { git = "https://github.com/paritytech/substrate", default-features = false }
 substrate-consensus-aura-primitives = { git = "https://github.com/paritytech/substrate", default-features = false }
 substrate-inherents = { git = "https://github.com/paritytech/substrate", default-features = false }
+substrate-offchain-primitives = { git = "https://github.com/paritytech/substrate", default-features = false }
 sr-std = { git = "https://github.com/paritytech/substrate", default-features = false }
 sr-io = { git = "https://github.com/paritytech/substrate", default-features = false }
 srml-support = { git = "https://github.com/paritytech/substrate", default-features = false }
diff --git a/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.compact.wasm b/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.compact.wasm
index 8129a8fc22ca..042f67c12fa0 100644
Binary files a/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.compact.wasm and b/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.compact.wasm differ
diff --git a/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.wasm b/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.wasm
index 96fd208601e4..97763d0865a9 100755
Binary files a/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.wasm and b/runtime/wasm/target/wasm32-unknown-unknown/release/polkadot_runtime.wasm differ
diff --git a/service/Cargo.toml b/service/Cargo.toml
index fcf0066973fd..b3acb68684b5 100644
--- a/service/Cargo.toml
+++ b/service/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "polkadot-service"
-version = "0.3.19"
+version = "0.3.20"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]