diff --git a/Cargo.lock b/Cargo.lock
index 4c37d65..91b3274 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -16,7 +16,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a49806b9dadc843c61e7c97e72490ad7f7220ae249012fbda9ad0609457c0543"
 dependencies = [
- "gimli",
+ "gimli 0.21.0",
 ]
 
 [[package]]
@@ -219,7 +219,7 @@ dependencies = [
  "addr2line",
  "cfg-if",
  "libc",
- "object",
+ "object 0.19.0",
  "rustc-demangle",
 ]
 
@@ -235,6 +235,22 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b41b7ea54a0c9d92199de89e20e58d49f02f8e699814ef3fdf266f6f748d15c7"
 
+[[package]]
+name = "base64"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3441f0f7b02788e948e47f457ca01f1d7e6d92c693bc132c22b087d3141c03ff"
+
+[[package]]
+name = "bincode"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f30d3a39baa26f9651f17b375061f3233dde33424a8b72b0dbe93a68a0bc896d"
+dependencies = [
+ "byteorder",
+ "serde",
+]
+
 [[package]]
 name = "bindgen"
 version = "0.53.3"
@@ -552,6 +568,98 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b3a71ab494c0b5b860bdc8407ae08978052417070c2ced38573a9157ad75b8ac"
 
+[[package]]
+name = "cranelift-bforest"
+version = "0.63.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4425bb6c3f3d2f581c650f1a1fdd3196a975490149cf59bea9d34c3bea79eda"
+dependencies = [
+ "cranelift-entity",
+]
+
+[[package]]
+name = "cranelift-codegen"
+version = "0.63.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d166b289fd30062ee6de86284750fc3fe5d037c6b864b3326ce153239b0626e1"
+dependencies = [
+ "byteorder",
+ "cranelift-bforest",
+ "cranelift-codegen-meta",
+ "cranelift-codegen-shared",
+ "cranelift-entity",
+ "gimli 0.20.0",
+ "log",
+ "regalloc",
+ "serde",
+ "smallvec 1.4.0",
+ "target-lexicon",
+ "thiserror",
+]
+
+[[package]]
+name = "cranelift-codegen-meta"
+version = "0.63.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "02c9fb2306a36d41c5facd4bf3400bc6c157185c43a96eaaa503471c34c5144b"
+dependencies = [
+ "cranelift-codegen-shared",
+ "cranelift-entity",
+]
+
+[[package]]
+name = "cranelift-codegen-shared"
+version = "0.63.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44e0cfe9b1f97d9f836bca551618106c7d53b93b579029ecd38e73daa7eb689e"
+
+[[package]]
+name = "cranelift-entity"
+version = "0.63.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "926a73c432e5ba9c891171ff50b75e7d992cd76cd271f0a0a0ba199138077472"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "cranelift-frontend"
+version = "0.63.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e45f82e3446dd1ebb8c2c2f6a6b0e6cd6cd52965c7e5f7b1b35e9a9ace31ccde"
+dependencies = [
+ "cranelift-codegen",
+ "log",
+ "smallvec 1.4.0",
+ "target-lexicon",
+]
+
+[[package]]
+name = "cranelift-native"
+version = "0.63.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "488b5d481bb0996a143e55a9d1739ef425efa20d4a5e5e98c859a8573c9ead9a"
+dependencies = [
+ "cranelift-codegen",
+ "raw-cpuid",
+ "target-lexicon",
+]
+
+[[package]]
+name = "cranelift-wasm"
+version = "0.63.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00aa8dde71fd9fdb1958e7b0ef8f524c1560e2c6165e4ea54bc302b40551c161"
+dependencies = [
+ "cranelift-codegen",
+ "cranelift-entity",
+ "cranelift-frontend",
+ "log",
+ "serde",
+ "thiserror",
+ "wasmparser 0.51.4",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.2.0"
@@ -776,6 +884,27 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "errno"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b480f641ccf0faf324e20c1d3e53d81b7484c698b42ea677f6907ae4db195371"
+dependencies = [
+ "errno-dragonfly",
+ "libc",
+ "winapi 0.3.8",
+]
+
+[[package]]
+name = "errno-dragonfly"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14ca354e36190500e1e1fb267c647932382b54053c50b14970856c0b00a35067"
+dependencies = [
+ "gcc",
+ "libc",
+]
+
 [[package]]
 name = "exit-future"
 version = "0.2.0"
@@ -785,6 +914,21 @@ dependencies = [
  "futures 0.3.5",
 ]
 
+[[package]]
+name = "faerie"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfef65b0e94693295c5d2fe2506f0ee6f43465342d4b5331659936aee8b16084"
+dependencies = [
+ "goblin",
+ "indexmap",
+ "log",
+ "scroll",
+ "string-interner",
+ "target-lexicon",
+ "thiserror",
+]
+
 [[package]]
 name = "failure"
 version = "0.1.8"
@@ -813,6 +957,12 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 
+[[package]]
+name = "fallible-iterator"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4443176a9f2c162692bd3d352d745ef9413eec5782a80d8fd6f8a1ac692a07f7"
+
 [[package]]
 name = "fdlimit"
 version = "0.1.4"
@@ -822,6 +972,16 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "file-per-thread-logger"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b3937f028664bd0e13df401ba49a4567ccda587420365823242977f06609ed1"
+dependencies = [
+ "env_logger",
+ "log",
+]
+
 [[package]]
 name = "finality-grandpa"
 version = "0.12.3"
@@ -876,16 +1036,16 @@ checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
 [[package]]
 name = "fork-tree"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "parity-scale-codec",
 ]
 
 [[package]]
 name = "frame-benchmarking"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support",
  "frame-system",
@@ -901,8 +1061,8 @@ dependencies = [
 
 [[package]]
 name = "frame-executive"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support",
  "frame-system",
@@ -916,8 +1076,8 @@ dependencies = [
 
 [[package]]
 name = "frame-metadata"
-version = "11.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "11.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "parity-scale-codec",
  "serde",
@@ -927,8 +1087,8 @@ dependencies = [
 
 [[package]]
 name = "frame-support"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "bitmask",
  "frame-metadata",
@@ -952,8 +1112,8 @@ dependencies = [
 
 [[package]]
 name = "frame-support-procedural"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support-procedural-tools",
  "proc-macro2",
@@ -963,8 +1123,8 @@ dependencies = [
 
 [[package]]
 name = "frame-support-procedural-tools"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support-procedural-tools-derive",
  "proc-macro-crate",
@@ -975,8 +1135,8 @@ dependencies = [
 
 [[package]]
 name = "frame-support-procedural-tools-derive"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "proc-macro2",
  "quote 1.0.7",
@@ -985,8 +1145,8 @@ dependencies = [
 
 [[package]]
 name = "frame-system"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support",
  "impl-trait-for-tuples",
@@ -1261,6 +1421,20 @@ dependencies = [
  "wasi",
 ]
 
+[[package]]
+name = "gimli"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81dd6190aad0f05ddbbf3245c54ed14ca4aa6dd32f22312b70d8f168c3e3e633"
+dependencies = [
+ "arrayvec 0.5.1",
+ "byteorder",
+ "fallible-iterator",
+ "indexmap",
+ "smallvec 1.4.0",
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "gimli"
 version = "0.21.0"
@@ -1286,6 +1460,17 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "goblin"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3081214398d39e4bd7f2c1975f0488ed04614ffdd976c6fc7a0708278552c0da"
+dependencies = [
+ "log",
+ "plain",
+ "scroll",
+]
+
 [[package]]
 name = "h2"
 version = "0.1.26"
@@ -1658,6 +1843,15 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "284f18f85651fe11e8a991b2adb42cb078325c996ed026d994719efcfca1d54b"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "0.4.5"
@@ -1747,6 +1941,20 @@ dependencies = [
  "unicase",
 ]
 
+[[package]]
+name = "jsonrpc-ipc-server"
+version = "14.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dedccd693325d833963b549e959137f30a7a0ea650cde92feda81dc0c1393cb5"
+dependencies = [
+ "jsonrpc-core",
+ "jsonrpc-server-utils",
+ "log",
+ "parity-tokio-ipc",
+ "parking_lot 0.10.2",
+ "tokio-service",
+]
+
 [[package]]
 name = "jsonrpc-pubsub"
 version = "14.2.0"
@@ -1866,6 +2074,12 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
 
+[[package]]
+name = "leb128"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3576a87f2ba00f6f106fdfcd16db1d698d648a26ad8e0573cad8537c3c362d2a"
+
 [[package]]
 name = "libc"
 version = "0.2.71"
@@ -2281,6 +2495,15 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "mach"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b823e83b2affd8f40a9ee8c29dbc56404c1e34cd2710921f2801e2cf29527afa"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "matches"
 version = "0.1.8"
@@ -2329,9 +2552,9 @@ dependencies = [
 
 [[package]]
 name = "memory-db"
-version = "0.20.1"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be512cb2ccb4ecbdca937fdd4a62ea5f09f8e7195466a85e4632b3d5bcce82e6"
+checksum = "fb2999ff7a65d5a1d72172f6d51fa2ea03024b51aee709ba5ff81c3c629a2410"
 dependencies = [
  "ahash",
  "hash-db",
@@ -2379,7 +2602,7 @@ dependencies = [
  "kernel32-sys",
  "libc",
  "log",
- "miow",
+ "miow 0.2.1",
  "net2",
  "slab",
  "winapi 0.2.8",
@@ -2397,6 +2620,18 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "mio-named-pipes"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f5e374eff525ce1c5b7687c4cef63943e7686524a387933ad27ca7ec43779cb3"
+dependencies = [
+ "log",
+ "mio",
+ "miow 0.3.5",
+ "winapi 0.3.8",
+]
+
 [[package]]
 name = "mio-uds"
 version = "0.6.8"
@@ -2420,6 +2655,22 @@ dependencies = [
  "ws2_32-sys",
 ]
 
+[[package]]
+name = "miow"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07b88fb9795d4d36d62a012dfbf49a8f5cf12751f36d31a9dbe66d528e58979e"
+dependencies = [
+ "socket2",
+ "winapi 0.3.8",
+]
+
+[[package]]
+name = "more-asserts"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0debeb9fcf88823ea64d64e4a815ab1643f33127d995978e099942ce38f25238"
+
 [[package]]
 name = "multihash"
 version = "0.11.2"
@@ -2521,7 +2772,7 @@ dependencies = [
 
 [[package]]
 name = "node-template"
-version = "2.0.0-rc3"
+version = "2.0.0-rc4"
 dependencies = [
  "futures 0.3.5",
  "log",
@@ -2550,7 +2801,7 @@ dependencies = [
 
 [[package]]
 name = "node-template-runtime"
-version = "2.0.0-rc3"
+version = "2.0.0-rc4"
 dependencies = [
  "frame-executive",
  "frame-support",
@@ -2683,6 +2934,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "object"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5666bbb90bc4d1e5bdcb26c0afda1822d25928341e9384ab187a9b37ab69e36"
+dependencies = [
+ "target-lexicon",
+]
+
 [[package]]
 name = "object"
 version = "0.19.0"
@@ -2721,8 +2981,8 @@ dependencies = [
 
 [[package]]
 name = "pallet-aura"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support",
  "frame-system",
@@ -2740,8 +3000,8 @@ dependencies = [
 
 [[package]]
 name = "pallet-balances"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-benchmarking",
  "frame-support",
@@ -2754,8 +3014,8 @@ dependencies = [
 
 [[package]]
 name = "pallet-finality-tracker"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support",
  "frame-system",
@@ -2770,8 +3030,8 @@ dependencies = [
 
 [[package]]
 name = "pallet-grandpa"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support",
  "frame-system",
@@ -2790,8 +3050,8 @@ dependencies = [
 
 [[package]]
 name = "pallet-randomness-collective-flip"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support",
  "frame-system",
@@ -2803,8 +3063,8 @@ dependencies = [
 
 [[package]]
 name = "pallet-session"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support",
  "frame-system",
@@ -2812,6 +3072,8 @@ dependencies = [
  "pallet-timestamp",
  "parity-scale-codec",
  "serde",
+ "sp-core",
+ "sp-io",
  "sp-runtime",
  "sp-session",
  "sp-staking",
@@ -2821,8 +3083,8 @@ dependencies = [
 
 [[package]]
 name = "pallet-sudo"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support",
  "frame-system",
@@ -2835,7 +3097,7 @@ dependencies = [
 
 [[package]]
 name = "pallet-template"
-version = "2.0.0-rc3"
+version = "2.0.0-rc4"
 dependencies = [
  "frame-support",
  "frame-system",
@@ -2847,8 +3109,8 @@ dependencies = [
 
 [[package]]
 name = "pallet-timestamp"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-benchmarking",
  "frame-support",
@@ -2864,13 +3126,14 @@ dependencies = [
 
 [[package]]
 name = "pallet-transaction-payment"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support",
  "frame-system",
  "pallet-transaction-payment-rpc-runtime-api",
  "parity-scale-codec",
+ "serde",
  "smallvec 1.4.0",
  "sp-runtime",
  "sp-std",
@@ -2878,8 +3141,8 @@ dependencies = [
 
 [[package]]
 name = "pallet-transaction-payment-rpc-runtime-api"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "frame-support",
  "parity-scale-codec",
@@ -2956,9 +3219,9 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec"
-version = "1.3.0"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "329c8f7f4244ddb5c37c103641027a76c530e65e8e4b8240b29f81ea40508b17"
+checksum = "a74f02beb35d47e0706155c9eac554b50c671e0d868fe8296bcdf44a9a4847bf"
 dependencies = [
  "arrayvec 0.5.1",
  "bitvec",
@@ -2985,6 +3248,25 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa9777aa91b8ad9dd5aaa04a9b6bcb02c7f1deb952fca5a66034d5e63afc5c6f"
 
+[[package]]
+name = "parity-tokio-ipc"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e57fea504fea33f9fbb5f49f378359030e7e026a6ab849bb9e8f0787376f1bf"
+dependencies = [
+ "bytes 0.4.12",
+ "futures 0.1.29",
+ "libc",
+ "log",
+ "mio-named-pipes",
+ "miow 0.3.5",
+ "rand 0.7.3",
+ "tokio 0.1.22",
+ "tokio-named-pipes",
+ "tokio-uds",
+ "winapi 0.3.8",
+]
+
 [[package]]
 name = "parity-util-mem"
 version = "0.6.1"
@@ -3165,6 +3447,12 @@ version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "05da548ad6865900e60eaba7f589cc0783590a92e940c26953ff81ddbab2d677"
 
+[[package]]
+name = "plain"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4596b6d070b27117e987119b4dac604f3c58cfb0b191112e24771b2faeac1a6"
+
 [[package]]
 name = "platforms"
 version = "0.2.1"
@@ -3292,7 +3580,7 @@ checksum = "02b10678c913ecbd69350e8535c3aef91a8676c0773fc1d7b95cdd196d7f2f26"
 dependencies = [
  "bytes 0.5.4",
  "heck",
- "itertools",
+ "itertools 0.8.2",
  "log",
  "multimap",
  "petgraph",
@@ -3309,7 +3597,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "537aa19b95acde10a12fec4301466386f757403de4cd4e5b4fa78fb5ecb18f72"
 dependencies = [
  "anyhow",
- "itertools",
+ "itertools 0.8.2",
  "proc-macro2",
  "quote 1.0.7",
  "syn 1.0.31",
@@ -3562,6 +3850,17 @@ dependencies = [
  "rand_core 0.3.1",
 ]
 
+[[package]]
+name = "raw-cpuid"
+version = "7.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4a349ca83373cfa5d6dbb66fd76e58b2cca08da71a5f6400de0a0a6a9bceeaf"
+dependencies = [
+ "bitflags",
+ "cc",
+ "rustc_version",
+]
+
 [[package]]
 name = "rawpointer"
 version = "0.2.1"
@@ -3638,6 +3937,17 @@ dependencies = [
  "syn 1.0.31",
 ]
 
+[[package]]
+name = "regalloc"
+version = "0.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b27b256b41986ac5141b37b8bbba85d314fbf546c182eb255af6720e07e4f804"
+dependencies = [
+ "log",
+ "rustc-hash",
+ "smallvec 1.4.0",
+]
+
 [[package]]
 name = "regex"
 version = "1.3.9"
@@ -3656,6 +3966,18 @@ version = "0.6.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "26412eb97c6b088a6997e05f69403a802a92d520de2f8e63c2b65f9e0f47c4e8"
 
+[[package]]
+name = "region"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "877e54ea2adcd70d80e9179344c97f93ef0dffd6b03e1f4529e6e83ab2fa9ae0"
+dependencies = [
+ "bitflags",
+ "libc",
+ "mach",
+ "winapi 0.3.8",
+]
+
 [[package]]
 name = "remove_dir_all"
 version = "0.5.2"
@@ -3665,6 +3987,27 @@ dependencies = [
  "winapi 0.3.8",
 ]
 
+[[package]]
+name = "rental"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8545debe98b2b139fb04cad8618b530e9b07c152d99a5de83c860b877d67847f"
+dependencies = [
+ "rental-impl",
+ "stable_deref_trait",
+]
+
+[[package]]
+name = "rental-impl"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "475e68978dc5b743f2f40d8e0a8fdc83f1c5e78cbf4b8fa5e74e73beebc340de"
+dependencies = [
+ "proc-macro2",
+ "quote 1.0.7",
+ "syn 1.0.31",
+]
+
 [[package]]
 name = "ring"
 version = "0.16.14"
@@ -3712,7 +4055,7 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2bc8af4bda8e1ff4932523b94d3dd20ee30a87232323eda55903ffd71d2fb017"
 dependencies = [
- "base64",
+ "base64 0.11.0",
  "blake2b_simd",
  "constant_time_eq",
  "crossbeam-utils",
@@ -3751,7 +4094,7 @@ version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c0d4a31f5d68413404705d6982529b0e11a9aacd4839d1d6222ee3b8cb4015e1"
 dependencies = [
- "base64",
+ "base64 0.11.0",
  "log",
  "ring",
  "sct",
@@ -3798,8 +4141,8 @@ dependencies = [
 
 [[package]]
 name = "sc-basic-authorship"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "futures 0.3.5",
  "futures-timer 3.0.2",
@@ -3822,8 +4165,8 @@ dependencies = [
 
 [[package]]
 name = "sc-block-builder"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "parity-scale-codec",
  "sc-client-api",
@@ -3838,8 +4181,8 @@ dependencies = [
 
 [[package]]
 name = "sc-chain-spec"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "impl-trait-for-tuples",
  "sc-chain-spec-derive",
@@ -3854,8 +4197,8 @@ dependencies = [
 
 [[package]]
 name = "sc-chain-spec-derive"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "proc-macro-crate",
  "proc-macro2",
@@ -3865,14 +4208,13 @@ dependencies = [
 
 [[package]]
 name = "sc-cli"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "ansi_term 0.12.1",
  "atty",
  "chrono",
  "derive_more",
- "directories",
  "env_logger",
  "fdlimit",
  "futures 0.3.5",
@@ -3906,8 +4248,8 @@ dependencies = [
 
 [[package]]
 name = "sc-client-api"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "fnv",
@@ -3942,8 +4284,8 @@ dependencies = [
 
 [[package]]
 name = "sc-client-db"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "blake2-rfc",
  "hash-db",
@@ -3971,8 +4313,8 @@ dependencies = [
 
 [[package]]
 name = "sc-consensus"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "sc-client-api",
  "sp-blockchain",
@@ -3982,8 +4324,8 @@ dependencies = [
 
 [[package]]
 name = "sc-consensus-aura"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "futures 0.3.5",
@@ -4013,8 +4355,8 @@ dependencies = [
 
 [[package]]
 name = "sc-consensus-slots"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "futures 0.3.5",
  "futures-timer 3.0.2",
@@ -4035,8 +4377,8 @@ dependencies = [
 
 [[package]]
 name = "sc-executor"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "lazy_static",
@@ -4047,6 +4389,7 @@ dependencies = [
  "parking_lot 0.10.2",
  "sc-executor-common",
  "sc-executor-wasmi",
+ "sc-executor-wasmtime",
  "sp-api",
  "sp-core",
  "sp-externalities",
@@ -4062,8 +4405,8 @@ dependencies = [
 
 [[package]]
 name = "sc-executor-common"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "log",
@@ -4079,8 +4422,8 @@ dependencies = [
 
 [[package]]
 name = "sc-executor-wasmi"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "log",
  "parity-scale-codec",
@@ -4092,10 +4435,31 @@ dependencies = [
  "wasmi",
 ]
 
+[[package]]
+name = "sc-executor-wasmtime"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
+dependencies = [
+ "cranelift-codegen",
+ "cranelift-wasm",
+ "log",
+ "parity-scale-codec",
+ "parity-wasm",
+ "sc-executor-common",
+ "scoped-tls",
+ "sp-allocator",
+ "sp-core",
+ "sp-runtime-interface",
+ "sp-wasm-interface",
+ "substrate-wasmtime",
+ "substrate-wasmtime-runtime",
+ "wasmtime-environ",
+]
+
 [[package]]
 name = "sc-finality-grandpa"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "assert_matches",
  "derive_more",
@@ -4117,6 +4481,7 @@ dependencies = [
  "sc-telemetry",
  "serde_json",
  "sp-api",
+ "sp-application-crypto",
  "sp-arithmetic",
  "sp-blockchain",
  "sp-consensus",
@@ -4131,28 +4496,31 @@ dependencies = [
 
 [[package]]
 name = "sc-informant"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "ansi_term 0.12.1",
  "futures 0.3.5",
  "log",
  "parity-util-mem",
+ "parking_lot 0.10.2",
  "sc-client-api",
  "sc-network",
- "sc-service",
  "sp-blockchain",
  "sp-runtime",
+ "sp-transaction-pool",
+ "sp-utils",
  "wasm-timer",
 ]
 
 [[package]]
 name = "sc-keystore"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "hex",
+ "merlin",
  "parking_lot 0.10.2",
  "rand 0.7.3",
  "serde_json",
@@ -4161,10 +4529,29 @@ dependencies = [
  "subtle 2.2.3",
 ]
 
+[[package]]
+name = "sc-light"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
+dependencies = [
+ "hash-db",
+ "lazy_static",
+ "parity-scale-codec",
+ "parking_lot 0.10.2",
+ "sc-client-api",
+ "sc-executor",
+ "sp-api",
+ "sp-blockchain",
+ "sp-core",
+ "sp-externalities",
+ "sp-runtime",
+ "sp-state-machine",
+]
+
 [[package]]
 name = "sc-network"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "bitflags",
  "bs58",
@@ -4215,8 +4602,8 @@ dependencies = [
 
 [[package]]
 name = "sc-network-gossip"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "futures 0.3.5",
  "futures-timer 3.0.2",
@@ -4230,8 +4617,8 @@ dependencies = [
 
 [[package]]
 name = "sc-offchain"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "bytes 0.5.4",
  "fnv",
@@ -4257,8 +4644,8 @@ dependencies = [
 
 [[package]]
 name = "sc-peerset"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "futures 0.3.5",
  "libp2p",
@@ -4270,8 +4657,8 @@ dependencies = [
 
 [[package]]
 name = "sc-proposer-metrics"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "log",
  "substrate-prometheus-endpoint",
@@ -4279,8 +4666,8 @@ dependencies = [
 
 [[package]]
 name = "sc-rpc"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "futures 0.3.5",
  "hash-db",
@@ -4311,8 +4698,8 @@ dependencies = [
 
 [[package]]
 name = "sc-rpc-api"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "futures 0.3.5",
@@ -4335,11 +4722,12 @@ dependencies = [
 
 [[package]]
 name = "sc-rpc-server"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "jsonrpc-core",
  "jsonrpc-http-server",
+ "jsonrpc-ipc-server",
  "jsonrpc-pubsub",
  "jsonrpc-ws-server",
  "log",
@@ -4350,10 +4738,11 @@ dependencies = [
 
 [[package]]
 name = "sc-service"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
+ "directories",
  "exit-future",
  "futures 0.1.29",
  "futures 0.3.5",
@@ -4375,7 +4764,9 @@ dependencies = [
  "sc-client-api",
  "sc-client-db",
  "sc-executor",
+ "sc-informant",
  "sc-keystore",
+ "sc-light",
  "sc-network",
  "sc-offchain",
  "sc-rpc",
@@ -4403,14 +4794,15 @@ dependencies = [
  "sp-version",
  "substrate-prometheus-endpoint",
  "sysinfo",
+ "tempfile",
  "tracing",
  "wasm-timer",
 ]
 
 [[package]]
 name = "sc-state-db"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "log",
  "parity-scale-codec",
@@ -4423,8 +4815,8 @@ dependencies = [
 
 [[package]]
 name = "sc-telemetry"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "bytes 0.5.4",
  "futures 0.3.5",
@@ -4445,23 +4837,25 @@ dependencies = [
 
 [[package]]
 name = "sc-tracing"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "erased-serde",
  "log",
  "parking_lot 0.10.2",
+ "rustc-hash",
  "sc-telemetry",
  "serde",
  "serde_json",
  "slog",
+ "sp-tracing",
  "tracing-core",
 ]
 
 [[package]]
 name = "sc-transaction-graph"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "futures 0.3.5",
@@ -4480,8 +4874,8 @@ dependencies = [
 
 [[package]]
 name = "sc-transaction-pool"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "futures 0.3.5",
@@ -4532,12 +4926,38 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "scoped-tls"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea6a9290e3c9cf0f18145ef7ffa62d68ee0bf5fcd651017e586dc7fd5da448c2"
+
 [[package]]
 name = "scopeguard"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
+[[package]]
+name = "scroll"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "abb2332cb595d33f7edd5700f4cbf94892e680c7f0ae56adab58a35190b66cb1"
+dependencies = [
+ "scroll_derive",
+]
+
+[[package]]
+name = "scroll_derive"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e367622f934864ffa1c704ba2b82280aab856e3d8213c84c5720257eb34b15b9"
+dependencies = [
+ "proc-macro2",
+ "quote 1.0.7",
+ "syn 1.0.31",
+]
+
 [[package]]
 name = "sct"
 version = "0.6.0"
@@ -4783,7 +5203,7 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1c9dab3f95c9ebdf3a88268c19af668f637a3c5039c2c56ff2d40b1b2d64a25b"
 dependencies = [
- "base64",
+ "base64 0.11.0",
  "bytes 0.5.4",
  "flate2",
  "futures 0.3.5",
@@ -4799,8 +5219,8 @@ dependencies = [
 
 [[package]]
 name = "sp-allocator"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "log",
@@ -4811,8 +5231,8 @@ dependencies = [
 
 [[package]]
 name = "sp-api"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "hash-db",
  "parity-scale-codec",
@@ -4826,8 +5246,8 @@ dependencies = [
 
 [[package]]
 name = "sp-api-proc-macro"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "blake2-rfc",
  "proc-macro-crate",
@@ -4838,8 +5258,8 @@ dependencies = [
 
 [[package]]
 name = "sp-application-crypto"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "parity-scale-codec",
  "serde",
@@ -4850,8 +5270,8 @@ dependencies = [
 
 [[package]]
 name = "sp-arithmetic"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "integer-sqrt",
  "num-traits 0.2.11",
@@ -4863,8 +5283,8 @@ dependencies = [
 
 [[package]]
 name = "sp-block-builder"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "parity-scale-codec",
  "sp-api",
@@ -4875,8 +5295,8 @@ dependencies = [
 
 [[package]]
 name = "sp-blockchain"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "log",
@@ -4891,8 +5311,8 @@ dependencies = [
 
 [[package]]
 name = "sp-chain-spec"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "serde",
  "serde_json",
@@ -4900,8 +5320,8 @@ dependencies = [
 
 [[package]]
 name = "sp-consensus"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "futures 0.3.5",
@@ -4919,12 +5339,13 @@ dependencies = [
  "sp-utils",
  "sp-version",
  "substrate-prometheus-endpoint",
+ "wasm-timer",
 ]
 
 [[package]]
 name = "sp-consensus-aura"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "parity-scale-codec",
  "sp-api",
@@ -4937,8 +5358,8 @@ dependencies = [
 
 [[package]]
 name = "sp-core"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "base58",
  "blake2-rfc",
@@ -4979,8 +5400,8 @@ dependencies = [
 
 [[package]]
 name = "sp-database"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "kvdb",
  "parking_lot 0.10.2",
@@ -4988,8 +5409,8 @@ dependencies = [
 
 [[package]]
 name = "sp-debug-derive"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "proc-macro2",
  "quote 1.0.7",
@@ -4998,8 +5419,8 @@ dependencies = [
 
 [[package]]
 name = "sp-externalities"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "environmental",
  "parity-scale-codec",
@@ -5009,8 +5430,8 @@ dependencies = [
 
 [[package]]
 name = "sp-finality-grandpa"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "finality-grandpa",
  "log",
@@ -5025,8 +5446,8 @@ dependencies = [
 
 [[package]]
 name = "sp-finality-tracker"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "parity-scale-codec",
  "sp-inherents",
@@ -5035,8 +5456,8 @@ dependencies = [
 
 [[package]]
 name = "sp-inherents"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "parity-scale-codec",
@@ -5047,8 +5468,8 @@ dependencies = [
 
 [[package]]
 name = "sp-io"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "futures 0.3.5",
  "hash-db",
@@ -5061,14 +5482,15 @@ dependencies = [
  "sp-runtime-interface",
  "sp-state-machine",
  "sp-std",
+ "sp-tracing",
  "sp-trie",
  "sp-wasm-interface",
 ]
 
 [[package]]
 name = "sp-keyring"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "lazy_static",
  "sp-core",
@@ -5078,8 +5500,8 @@ dependencies = [
 
 [[package]]
 name = "sp-offchain"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "sp-api",
  "sp-core",
@@ -5088,8 +5510,8 @@ dependencies = [
 
 [[package]]
 name = "sp-panic-handler"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "backtrace",
  "log",
@@ -5097,8 +5519,8 @@ dependencies = [
 
 [[package]]
 name = "sp-rpc"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "serde",
  "sp-core",
@@ -5106,9 +5528,10 @@ dependencies = [
 
 [[package]]
 name = "sp-runtime"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
+ "either",
  "hash256-std-hasher",
  "impl-trait-for-tuples",
  "log",
@@ -5127,8 +5550,8 @@ dependencies = [
 
 [[package]]
 name = "sp-runtime-interface"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "parity-scale-codec",
  "primitive-types",
@@ -5142,8 +5565,8 @@ dependencies = [
 
 [[package]]
 name = "sp-runtime-interface-proc-macro"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "Inflector",
  "proc-macro-crate",
@@ -5154,8 +5577,8 @@ dependencies = [
 
 [[package]]
 name = "sp-serializer"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "serde",
  "serde_json",
@@ -5163,8 +5586,8 @@ dependencies = [
 
 [[package]]
 name = "sp-session"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "parity-scale-codec",
  "sp-api",
@@ -5176,8 +5599,8 @@ dependencies = [
 
 [[package]]
 name = "sp-staking"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "parity-scale-codec",
  "sp-runtime",
@@ -5186,15 +5609,17 @@ dependencies = [
 
 [[package]]
 name = "sp-state-machine"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "hash-db",
+ "itertools 0.9.0",
  "log",
  "num-traits 0.2.11",
  "parity-scale-codec",
  "parking_lot 0.10.2",
  "rand 0.7.3",
+ "smallvec 1.4.0",
  "sp-core",
  "sp-externalities",
  "sp-panic-handler",
@@ -5205,13 +5630,13 @@ dependencies = [
 
 [[package]]
 name = "sp-std"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 
 [[package]]
 name = "sp-storage"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "impl-serde 0.2.3",
  "ref-cast",
@@ -5222,8 +5647,8 @@ dependencies = [
 
 [[package]]
 name = "sp-timestamp"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "impl-trait-for-tuples",
  "parity-scale-codec",
@@ -5236,16 +5661,18 @@ dependencies = [
 
 [[package]]
 name = "sp-tracing"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
+ "log",
+ "rental",
  "tracing",
 ]
 
 [[package]]
 name = "sp-transaction-pool"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "derive_more",
  "futures 0.3.5",
@@ -5260,8 +5687,8 @@ dependencies = [
 
 [[package]]
 name = "sp-trie"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "hash-db",
  "memory-db",
@@ -5274,19 +5701,20 @@ dependencies = [
 
 [[package]]
 name = "sp-utils"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "futures 0.3.5",
  "futures-core",
+ "futures-timer 3.0.2",
  "lazy_static",
  "prometheus",
 ]
 
 [[package]]
 name = "sp-version"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "impl-serde 0.2.3",
  "parity-scale-codec",
@@ -5297,8 +5725,8 @@ dependencies = [
 
 [[package]]
 name = "sp-wasm-interface"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "impl-trait-for-tuples",
  "parity-scale-codec",
@@ -5342,6 +5770,15 @@ dependencies = [
  "bytes 0.4.12",
 ]
 
+[[package]]
+name = "string-interner"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd710eadff449a1531351b0e43eb81ea404336fa2f56c777427ab0e32a4cf183"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "strsim"
 version = "0.8.0"
@@ -5407,16 +5844,16 @@ dependencies = [
 
 [[package]]
 name = "substrate-build-script-utils"
-version = "2.0.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "2.0.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "platforms",
 ]
 
 [[package]]
 name = "substrate-prometheus-endpoint"
-version = "0.8.0-rc3"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+version = "0.8.0-rc4"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
 dependencies = [
  "async-std",
  "derive_more",
@@ -5430,7 +5867,96 @@ dependencies = [
 [[package]]
 name = "substrate-wasm-builder-runner"
 version = "1.0.6"
-source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc3#34695a85650b58bcd7d7e2a677cafc2921251d68"
+source = "git+https://github.com/paritytech/substrate.git?tag=v2.0.0-rc4#00768a1f21a579c478fe5d4f51e1fa71f7db9fd4"
+
+[[package]]
+name = "substrate-wasmtime"
+version = "0.16.0-threadsafe.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6bd62264edc1a5f3ef44d86fb0c11c9fb142894b9a2da034f34afae482080d7a"
+dependencies = [
+ "anyhow",
+ "backtrace",
+ "cfg-if",
+ "lazy_static",
+ "libc",
+ "region",
+ "rustc-demangle",
+ "substrate-wasmtime-jit",
+ "substrate-wasmtime-profiling",
+ "substrate-wasmtime-runtime",
+ "target-lexicon",
+ "wasmparser 0.52.2",
+ "wasmtime-environ",
+ "wat",
+ "winapi 0.3.8",
+]
+
+[[package]]
+name = "substrate-wasmtime-jit"
+version = "0.16.0-threadsafe.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ce43c159d4f3ef6b19641e1ae045847fd202d8e2cc74df7ccb2b6475e069d4a"
+dependencies = [
+ "anyhow",
+ "cfg-if",
+ "cranelift-codegen",
+ "cranelift-entity",
+ "cranelift-frontend",
+ "cranelift-native",
+ "cranelift-wasm",
+ "gimli 0.20.0",
+ "log",
+ "more-asserts",
+ "region",
+ "substrate-wasmtime-profiling",
+ "substrate-wasmtime-runtime",
+ "target-lexicon",
+ "thiserror",
+ "wasmparser 0.52.2",
+ "wasmtime-debug",
+ "wasmtime-environ",
+ "winapi 0.3.8",
+]
+
+[[package]]
+name = "substrate-wasmtime-profiling"
+version = "0.16.0-threadsafe.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c77f0ce539b5a09a54dc80a1cf0c7cd7e694df11029354fe50a2d5fe889bdb97"
+dependencies = [
+ "anyhow",
+ "cfg-if",
+ "gimli 0.20.0",
+ "lazy_static",
+ "libc",
+ "object 0.18.0",
+ "scroll",
+ "serde",
+ "substrate-wasmtime-runtime",
+ "target-lexicon",
+ "wasmtime-environ",
+]
+
+[[package]]
+name = "substrate-wasmtime-runtime"
+version = "0.16.0-threadsafe.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46516af0a64a7d9b652c5aa7436b6ce13edfa54435a66ef177fc02d2283e2dc2"
+dependencies = [
+ "backtrace",
+ "cc",
+ "cfg-if",
+ "indexmap",
+ "lazy_static",
+ "libc",
+ "memoffset",
+ "more-asserts",
+ "region",
+ "thiserror",
+ "wasmtime-environ",
+ "winapi 0.3.8",
+]
 
 [[package]]
 name = "subtle"
@@ -5519,6 +6045,12 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f764005d11ee5f36500a149ace24e00e3da98b0158b3e2d53a7495660d3f4d60"
 
+[[package]]
+name = "target-lexicon"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab0e7238dcc7b40a7be719a25365910f6807bd864f4cce6b2e6b873658e2b19d"
+
 [[package]]
 name = "tempfile"
 version = "3.1.0"
@@ -5745,6 +6277,19 @@ dependencies = [
  "log",
 ]
 
+[[package]]
+name = "tokio-named-pipes"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d282d483052288b2308ba5ee795f5673b159c9bdf63c385a05609da782a5eae"
+dependencies = [
+ "bytes 0.4.12",
+ "futures 0.1.29",
+ "mio",
+ "mio-named-pipes",
+ "tokio 0.1.22",
+]
+
 [[package]]
 name = "tokio-reactor"
 version = "0.1.12"
@@ -5776,6 +6321,15 @@ dependencies = [
  "webpki",
 ]
 
+[[package]]
+name = "tokio-service"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24da22d077e0f15f55162bdbdc661228c1581892f52074fb242678d015b45162"
+dependencies = [
+ "futures 0.1.29",
+]
+
 [[package]]
 name = "tokio-sync"
 version = "0.1.8"
@@ -5935,9 +6489,9 @@ dependencies = [
 
 [[package]]
 name = "trie-db"
-version = "0.20.1"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bcc309f34008563989045a4c4dbcc5770467f3a3785ee80a9b5cc0d83362475f"
+checksum = "cb230c24c741993b04cfccbabb45acff6f6480c5f00d3ed8794ea43db3a9d727"
 dependencies = [
  "hash-db",
  "hashbrown",
@@ -6235,6 +6789,81 @@ dependencies = [
  "parity-wasm",
 ]
 
+[[package]]
+name = "wasmparser"
+version = "0.51.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aeb1956b19469d1c5e63e459d29e7b5aa0f558d9f16fcef09736f8a265e6c10a"
+
+[[package]]
+name = "wasmparser"
+version = "0.52.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "733954023c0b39602439e60a65126fd31b003196d3a1e8e4531b055165a79b31"
+
+[[package]]
+name = "wasmtime-debug"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d39ba645aee700b29ff0093028b4123556dd142a74973f04ed6225eedb40e77d"
+dependencies = [
+ "anyhow",
+ "faerie",
+ "gimli 0.20.0",
+ "more-asserts",
+ "target-lexicon",
+ "thiserror",
+ "wasmparser 0.51.4",
+ "wasmtime-environ",
+]
+
+[[package]]
+name = "wasmtime-environ"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed54fd9d64dfeeee7c285fd126174a6b5e6d4efc7e5a1566fdb635e60ff6a74e"
+dependencies = [
+ "anyhow",
+ "base64 0.12.3",
+ "bincode",
+ "cranelift-codegen",
+ "cranelift-entity",
+ "cranelift-wasm",
+ "directories",
+ "errno",
+ "file-per-thread-logger",
+ "indexmap",
+ "libc",
+ "log",
+ "more-asserts",
+ "rayon",
+ "serde",
+ "sha2",
+ "thiserror",
+ "toml",
+ "wasmparser 0.51.4",
+ "winapi 0.3.8",
+ "zstd",
+]
+
+[[package]]
+name = "wast"
+version = "21.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b1844f66a2bc8526d71690104c0e78a8e59ffa1597b7245769d174ebb91deb5"
+dependencies = [
+ "leb128",
+]
+
+[[package]]
+name = "wat"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce85d72b74242c340e9e3492cfb602652d7bb324c3172dd441b5577e39a2e18c"
+dependencies = [
+ "wast",
+]
+
 [[package]]
 name = "web-sys"
 version = "0.3.40"
@@ -6398,3 +7027,34 @@ dependencies = [
  "syn 1.0.31",
  "synstructure",
 ]
+
+[[package]]
+name = "zstd"
+version = "0.5.3+zstd.1.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01b32eaf771efa709e8308605bbf9319bf485dc1503179ec0469b611937c0cd8"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "2.0.5+zstd.1.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1cfb642e0d27f64729a639c52db457e0ae906e7bc6f5fe8f5c453230400f1055"
+dependencies = [
+ "libc",
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "1.4.17+zstd.1.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b89249644df056b522696b1bb9e7c18c87e8ffa3e2f0dc3b0155875d6498f01b"
+dependencies = [
+ "cc",
+ "glob",
+ "itertools 0.9.0",
+ "libc",
+]
diff --git a/README.md b/README.md
index ee30d9e..0bc031d 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,25 @@
 
 # Substrate Node Template
 
-A new FRAME-based Substrate node, ready for hacking.
+A new FRAME-based Substrate node, ready for hacking :rocket:
 
-## Build
+## Local Development
+
+Follow these steps to prepare your local environment for Substrate development :hammer_and_wrench:
+
+### Simple Method
+
+You can install all the required dependencies with a single command (be patient, this can take up
+to 30 minutes).
+
+```bash
+curl https://getsubstrate.io -sSf | bash -s -- --fast
+```
+
+### Manual Method
+
+Manual steps for Linux-based systems can be found below; you can
+[find more information at substrate.dev](https://substrate.dev/docs/en/knowledgebase/getting-started/#manual-installation).
 
 Install Rust:
 
@@ -18,12 +34,22 @@ Initialize your Wasm Build environment:
 ./scripts/init.sh
 ```
 
-Build Wasm and native code:
+### Build
+
+Once you have prepared your local development environment, you can build the node template. Use this
+command to build the [Wasm](https://substrate.dev/docs/en/knowledgebase/advanced/executor#wasm-execution)
+and [native](https://substrate.dev/docs/en/knowledgebase/advanced/executor#native-execution) code:
 
 ```bash
 cargo build --release
 ```
 
+## Playground [![Try on playground](https://img.shields.io/badge/Playground-node_template-brightgreen?logo=Parity%20Substrate)](https://playground-staging.substrate.dev/?deploy=node-template)
+
+[The Substrate Playground](https://playground-staging.substrate.dev/?deploy=node-template) is an
+online development environment that allows you to take advantage of a pre-configured container
+with pre-compiled build artifacts :woman_cartwheeling:
+
 ## Run
 
 ### Single Node Development Chain
@@ -40,46 +66,18 @@ Start a development chain with:
 ./target/release/node-template --dev
 ```
 
-Detailed logs may be shown by running the node with the following environment variables set: `RUST_LOG=debug RUST_BACKTRACE=1 cargo run -- --dev`.
+Detailed logs may be shown by running the node with the following environment variables set:
+`RUST_LOG=debug RUST_BACKTRACE=1 cargo run -- --dev`.
 
 ### Multi-Node Local Testnet
 
-If you want to see the multi-node consensus algorithm in action locally, then you can create a local testnet with two validator nodes for Alice and Bob, who are the initial authorities of the genesis chain that have been endowed with testnet units.
-
-Optionally, give each node a name and expose them so they are listed on the Polkadot [telemetry site](https://telemetry.polkadot.io/#/Local%20Testnet).
-
-You'll need two terminal windows open.
-
-We'll start Alice's substrate node first on default TCP port 30333 with her chain database stored locally at `/tmp/alice`. The bootnode ID of her node is `QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR`, which is generated from the `--node-key` value that we specify below:
-
-```bash
-cargo run -- \
-  --base-path /tmp/alice \
-  --chain=local \
-  --alice \
-  --node-key 0000000000000000000000000000000000000000000000000000000000000001 \
-  --telemetry-url 'ws://telemetry.polkadot.io:1024 0' \
-  --validator
-```
-
-In the second terminal, we'll start Bob's substrate node on a different TCP port of 30334, and with his chain database stored locally at `/tmp/bob`. We'll specify a value for the `--bootnodes` option that will connect his node to Alice's bootnode ID on TCP port 30333:
-
-```bash
-cargo run -- \
-  --base-path /tmp/bob \
-  --bootnodes /ip4/127.0.0.1/tcp/30333/p2p/QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR \
-  --chain=local \
-  --bob \
-  --port 30334 \
-  --telemetry-url 'ws://telemetry.polkadot.io:1024 0' \
-  --validator
-```
-
-Additional CLI usage options are available and may be shown by running `cargo run -- --help`.
+If you want to see the multi-node consensus algorithm in action, refer to
+[our Start a Private Network tutorial](https://substrate.dev/docs/en/tutorials/start-a-private-network/).
 
 ### Run in Docker
 
-First, install [Docker](https://docs.docker.com/get-docker/) and [Docker Compose](https://docs.docker.com/compose/install/).
+First, install [Docker](https://docs.docker.com/get-docker/) and
+[Docker Compose](https://docs.docker.com/compose/install/).
 
 Then run the following command to start a single node development chain.
 
@@ -87,7 +85,9 @@ Then run the following command to start a single node development chain.
 ./scripts/docker_run.sh
 ```
 
-This command will firstly compile your code, and then start a local development network. You can also replace the default command (`cargo build --release && ./target/release/node-template --dev --ws-external`) by appending your own. A few useful ones are as follow.
+This command will firstly compile your code, and then start a local development network. You can
+also replace the default command (`cargo build --release && ./target/release/node-template --dev --ws-external`)
+by appending your own. A few useful ones are as follow.
 
 ```bash
 # Run Substrate node without re-compiling
@@ -99,29 +99,3 @@ This command will firstly compile your code, and then start a local development
 # Check whether the code is compilable
 ./scripts/docker_run.sh cargo check
 ```
-
-## Advanced: Generate Your Own Substrate Node Template
-
-A substrate node template is always based on a certain version of Substrate. You can inspect it by
-opening [Cargo.toml](Cargo.toml) and see the template referred to a specific Substrate commit(
-`rev` field), branch, or version.
-
-You can generate your own Substrate node-template based on a particular Substrate
-version/commit by running following commands:
-
-```bash
-# git clone from the main Substrate repo
-git clone https://github.com/paritytech/substrate.git
-cd substrate
-
-# Switch to a particular branch or commit of the Substrate repo your node-template based on
-git checkout <branch/tag/sha1>
-
-# Run the helper script to generate a node template.
-# This script compiles Substrate and takes a while to complete. It takes a relative file path
-#   from the current dir. to output the compressed node template.
-.maintain/node-template-release.sh ../node-template.tar.gz
-```
-
-Noted though you will likely get faster and more thorough support if you stick with the releases
-provided in this repository.
diff --git a/node/Cargo.toml b/node/Cargo.toml
index 272e10d..d2b4f73 100644
--- a/node/Cargo.toml
+++ b/node/Cargo.toml
@@ -1,25 +1,19 @@
-[build-dependencies.substrate-build-script-utils]
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[[bin]]
-name = 'node-template'
-
 [package]
 authors = ['Substrate DevHub <https://github.com/substrate-developer-hub>']
 build = 'build.rs'
-description = 'Substrate node template'
+description = 'Substrate Node template'
 edition = '2018'
-homepage = 'https://substrate.io'
+homepage = 'https://substrate.dev'
 license = 'Unlicense'
 name = 'node-template'
 repository = 'https://github.com/substrate-developer-hub/substrate-node-template/'
-version = '2.0.0-rc3'
-
+version = '2.0.0-rc4'
 [package.metadata.docs.rs]
 targets = ['x86_64-unknown-linux-gnu']
 
+[[bin]]
+name = 'node-template'
+
 [dependencies]
 futures = '0.3.4'
 log = '0.4.8'
@@ -28,89 +22,96 @@ structopt = '0.3.8'
 
 [dependencies.node-template-runtime]
 path = '../runtime'
-version = '2.0.0-rc3'
+version = '2.0.0-rc4'
 
 [dependencies.sc-basic-authorship]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '0.8.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '0.8.0-rc4'
 
 [dependencies.sc-cli]
+features = ['wasmtime']
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '0.8.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '0.8.0-rc4'
 
 [dependencies.sc-client-api]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
 
 [dependencies.sc-consensus]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '0.8.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '0.8.0-rc4'
 
 [dependencies.sc-consensus-aura]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '0.8.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '0.8.0-rc4'
 
 [dependencies.sc-executor]
+features = ['wasmtime']
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '0.8.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '0.8.0-rc4'
 
 [dependencies.sc-finality-grandpa]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '0.8.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '0.8.0-rc4'
 
 [dependencies.sc-network]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '0.8.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '0.8.0-rc4'
 
 [dependencies.sc-service]
+features = ['wasmtime']
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '0.8.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '0.8.0-rc4'
 
 [dependencies.sc-transaction-pool]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
 
 [dependencies.sp-consensus]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '0.8.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '0.8.0-rc4'
 
 [dependencies.sp-consensus-aura]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '0.8.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '0.8.0-rc4'
 
 [dependencies.sp-core]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
 
 [dependencies.sp-finality-grandpa]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
 
 [dependencies.sp-inherents]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
 
 [dependencies.sp-runtime]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
 
 [dependencies.sp-transaction-pool]
 git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+[build-dependencies.substrate-build-script-utils]
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
diff --git a/node/src/lib.rs b/node/src/lib.rs
new file mode 100644
index 0000000..38e4337
--- /dev/null
+++ b/node/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod chain_spec;
+pub mod service;
diff --git a/node/src/service.rs b/node/src/service.rs
index 17606e2..e330c17 100644
--- a/node/src/service.rs
+++ b/node/src/service.rs
@@ -111,7 +111,7 @@ pub fn new_full(config: Configuration) -> Result<impl AbstractService, ServiceEr
 			let provider = client as Arc<dyn StorageAndProofProvider<_, _>>;
 			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, provider)) as _)
 		})?
-		.build()?;
+		.build_full()?;
 
 	if role.is_authority() {
 		let proposer = sc_basic_authorship::ProposerFactory::new(
@@ -142,13 +142,13 @@ pub fn new_full(config: Configuration) -> Result<impl AbstractService, ServiceEr
 
 		// the AURA authoring task is considered essential, i.e. if it
 		// fails we take down the service with it.
-		service.spawn_essential_task("aura", aura);
+		service.spawn_essential_task_handle().spawn_blocking("aura", aura);
 	}
 
 	// if the node isn't actively participating in consensus then it doesn't
 	// need a keystore, regardless of which protocol we use below.
 	let keystore = if role.is_authority() {
-		Some(service.keystore())
+		Some(service.keystore() as sp_core::traits::BareCryptoStorePtr)
 	} else {
 		None
 	};
@@ -184,7 +184,7 @@ pub fn new_full(config: Configuration) -> Result<impl AbstractService, ServiceEr
 
 		// the GRANDPA voter task is considered infallible, i.e.
 		// if it fails we take down the service with it.
-		service.spawn_essential_task(
+		service.spawn_essential_task_handle().spawn_blocking(
 			"grandpa-voter",
 			sc_finality_grandpa::run_grandpa_voter(grandpa_config)?
 		);
@@ -264,5 +264,5 @@ pub fn new_light(config: Configuration) -> Result<impl AbstractService, ServiceE
 			let provider = client as Arc<dyn StorageAndProofProvider<_, _>>;
 			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, provider)) as _)
 		})?
-		.build()
+		.build_light()
 }
diff --git a/pallets/template/Cargo.toml b/pallets/template/Cargo.toml
index 38ef51a..cc73534 100644
--- a/pallets/template/Cargo.toml
+++ b/pallets/template/Cargo.toml
@@ -1,49 +1,48 @@
-[dependencies.codec]
-default-features = false
-features = ['derive']
-package = 'parity-scale-codec'
-version = '1.3.0'
-
-[dependencies.frame-support]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.frame-system]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-[dev-dependencies.sp-core]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dev-dependencies.sp-io]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dev-dependencies.sp-runtime]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
 [package]
 authors = ['Substrate DevHub <https://github.com/substrate-developer-hub>']
 description = 'FRAME pallet template'
 edition = '2018'
-homepage = 'https://substrate.io'
+homepage = 'https://substrate.dev'
 license = 'Unlicense'
 name = 'pallet-template'
 repository = 'https://github.com/substrate-developer-hub/substrate-node-template/'
-version = '2.0.0-rc3'
+version = '2.0.0-rc4'
 [package.metadata.docs.rs]
 targets = ['x86_64-unknown-linux-gnu']
+[dependencies.codec]
+default-features = false
+features = ['derive']
+package = 'parity-scale-codec'
+version = '1.3.1'
+
+[dependencies.frame-support]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.frame-system]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+[dev-dependencies.sp-core]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dev-dependencies.sp-io]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dev-dependencies.sp-runtime]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
 
 [features]
 default = ['std']
diff --git a/pallets/template/src/mock.rs b/pallets/template/src/mock.rs
index 4eed0e1..0d9ae7c 100644
--- a/pallets/template/src/mock.rs
+++ b/pallets/template/src/mock.rs
@@ -24,6 +24,7 @@ parameter_types! {
 	pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
 }
 impl system::Trait for Test {
+	type BaseCallFilter = ();
 	type Origin = Origin;
 	type Call = ();
 	type Index = u64;
diff --git a/runtime/Cargo.toml b/runtime/Cargo.toml
index 4e51aa6..1b46463 100644
--- a/runtime/Cargo.toml
+++ b/runtime/Cargo.toml
@@ -1,176 +1,3 @@
-[dependencies.aura]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-package = 'pallet-aura'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.balances]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-package = 'pallet-balances'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.codec]
-default-features = false
-features = ['derive']
-package = 'parity-scale-codec'
-version = '1.3.0'
-
-[dependencies.frame-executive]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.frame-support]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.grandpa]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-package = 'pallet-grandpa'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.randomness-collective-flip]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-package = 'pallet-randomness-collective-flip'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.serde]
-features = ['derive']
-optional = true
-version = '1.0.101'
-
-[dependencies.sp-api]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.sp-block-builder]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.sp-consensus-aura]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '0.8.0-rc3'
-
-[dependencies.sp-core]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.sp-inherents]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.sp-io]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.sp-offchain]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.sp-runtime]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.sp-session]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.sp-std]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.sp-transaction-pool]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.sp-version]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.sudo]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-package = 'pallet-sudo'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.system]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-package = 'frame-system'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.template]
-default-features = false
-package = 'pallet-template'
-path = '../pallets/template'
-version = '2.0.0-rc3'
-
-[dependencies.timestamp]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-package = 'pallet-timestamp'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-
-[dependencies.transaction-payment]
-default-features = false
-git = 'https://github.com/paritytech/substrate.git'
-package = 'pallet-transaction-payment'
-tag = 'v2.0.0-rc3'
-version = '2.0.0-rc3'
-[build-dependencies.wasm-builder-runner]
-git = 'https://github.com/paritytech/substrate.git'
-package = 'substrate-wasm-builder-runner'
-tag = 'v2.0.0-rc3'
-version = '1.0.5'
-
-[package]
-authors = ['Substrate DevHub <https://github.com/substrate-developer-hub>']
-edition = '2018'
-homepage = 'https://substrate.io'
-license = 'Unlicense'
-name = 'node-template-runtime'
-repository = 'https://github.com/substrate-developer-hub/substrate-node-template/'
-version = '2.0.0-rc3'
-[package.metadata.docs.rs]
-targets = ['x86_64-unknown-linux-gnu']
-
 [features]
 default = ['std']
 std = [
@@ -200,3 +27,175 @@ std = [
     'transaction-payment/std',
     'template/std',
 ]
+[dependencies.aura]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'pallet-aura'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.balances]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'pallet-balances'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.codec]
+default-features = false
+features = ['derive']
+package = 'parity-scale-codec'
+version = '1.3.1'
+
+[dependencies.frame-executive]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.frame-support]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.grandpa]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'pallet-grandpa'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.randomness-collective-flip]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'pallet-randomness-collective-flip'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.serde]
+features = ['derive']
+optional = true
+version = '1.0.101'
+
+[dependencies.sp-api]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.sp-block-builder]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.sp-consensus-aura]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '0.8.0-rc4'
+
+[dependencies.sp-core]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.sp-inherents]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.sp-io]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.sp-offchain]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.sp-runtime]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.sp-session]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.sp-std]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.sp-transaction-pool]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.sp-version]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.sudo]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'pallet-sudo'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.system]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'frame-system'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.template]
+default-features = false
+package = 'pallet-template'
+path = '../pallets/template'
+version = '2.0.0-rc4'
+
+[dependencies.timestamp]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'pallet-timestamp'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[dependencies.transaction-payment]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'pallet-transaction-payment'
+tag = 'v2.0.0-rc4'
+version = '2.0.0-rc4'
+
+[package]
+authors = ['Substrate DevHub <https://github.com/substrate-developer-hub>']
+edition = '2018'
+homepage = 'https://substrate.dev'
+license = 'Unlicense'
+name = 'node-template-runtime'
+repository = 'https://github.com/substrate-developer-hub/substrate-node-template/'
+version = '2.0.0-rc4'
+[package.metadata.docs.rs]
+targets = ['x86_64-unknown-linux-gnu']
+[build-dependencies.wasm-builder-runner]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-wasm-builder-runner'
+tag = 'v2.0.0-rc4'
+version = '1.0.5'
diff --git a/runtime/src/lib.rs b/runtime/src/lib.rs
index 68d4eee..c58c478 100644
--- a/runtime/src/lib.rs
+++ b/runtime/src/lib.rs
@@ -135,6 +135,8 @@ parameter_types! {
 }
 
 impl system::Trait for Runtime {
+	/// The basic call filter to use in dispatchable.
+	type BaseCallFilter = ();
 	/// The identifier used to distinguish between accounts.
 	type AccountId = AccountId;
 	/// The aggregated dispatch type that is available for extrinsics.