diff --git a/pool/fuzz/Cargo.lock b/pool/fuzz/Cargo.lock
index 42f3ce04..01e33b3f 100644
--- a/pool/fuzz/Cargo.lock
+++ b/pool/fuzz/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "addr2line"
 version = "0.13.0"
@@ -100,7 +102,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "46254cf2fdcdf1badb5934448c1bcbe046a56537b3987d96c51a7afc5d03f293"
 dependencies = [
  "addr2line",
- "cfg-if",
+ "cfg-if 0.1.10",
  "libc",
  "miniz_oxide",
  "object",
@@ -125,13 +127,12 @@ checksum = "3441f0f7b02788e948e47f457ca01f1d7e6d92c693bc132c22b087d3141c03ff"
 
 [[package]]
 name = "bindgen"
-version = "0.52.0"
+version = "0.56.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1c85344eb535a31b62f0af37be84441ba9e7f0f4111eb0530f43d15e513fe57"
+checksum = "2da379dbebc0b76ef63ca68d8fc6e71c0f13e59432e0987e508c1820e6ab5239"
 dependencies = [
  "bitflags 1.2.1",
  "cexpr",
- "cfg-if",
  "clang-sys",
  "clap",
  "env_logger",
@@ -139,8 +140,8 @@ dependencies = [
  "lazycell",
  "log",
  "peeking_take_while",
- "proc-macro2 1.0.18",
- "quote 1.0.7",
+ "proc-macro2",
+ "quote",
  "regex",
  "rustc-hash",
  "shlex",
@@ -197,6 +198,12 @@ version = "1.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
 
+[[package]]
+name = "bytes"
+version = "0.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e4cec68f03f32e44924783795810fa50a7035d8c8ebe78580ad7e6c703fba38"
+
 [[package]]
 name = "cc"
 version = "1.0.58"
@@ -205,9 +212,9 @@ checksum = "f9a06fb2e53271d7c279ec1efea6ab691c35a2ae67ec0d91d7acec0caf13b518"
 
 [[package]]
 name = "cexpr"
-version = "0.3.6"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fce5b5fb86b0c57c20c834c1b412fd09c77c8a59b9473f86272709e78874cd1d"
+checksum = "f4aedb84272dbe89af497cf81375129abda4fc0a9e7c5d317498c15cc30c0d27"
 dependencies = [
  "nom",
 ]
@@ -218,6 +225,12 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
 [[package]]
 name = "chrono"
 version = "0.4.13"
@@ -232,9 +245,9 @@ dependencies = [
 
 [[package]]
 name = "clang-sys"
-version = "0.28.1"
+version = "1.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "81de550971c976f176130da4b2978d3b524eaa0fd9ac31f3ceb5ae1231fb4853"
+checksum = "5a050e2153c5be08febd6734e29298e844fdb0fa21aeddd63b4eb7baa106c69b"
 dependencies = [
  "glob",
  "libc",
@@ -277,25 +290,25 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ba125de2af0df55319f41944744ad91c71113bf74a4646efff39afe1f6842db1"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
 ]
 
 [[package]]
-name = "croaring-mw"
-version = "0.4.5"
+name = "croaring"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bcdee571ce4bf3e49c382de29c38bd33b9fa871e1358c7749b9dcc5dc2776221"
+checksum = "a00d14ad7d8cc067d7a5c93e8563791bfec3f7182361db955530db11d94ed63c"
 dependencies = [
  "byteorder",
- "croaring-sys-mw",
+ "croaring-sys",
  "libc",
 ]
 
 [[package]]
-name = "croaring-sys-mw"
-version = "0.4.5"
+name = "croaring-sys"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea52c177269fa54c526b054dac8e623721de18143ebfd2ea84ffc023d6c271ee"
+checksum = "c5d6a46501bb403a61e43bc7cd19977b4f9c54efd703949b00259cc61afb5a86"
 dependencies = [
  "bindgen",
  "cc",
@@ -338,12 +351,12 @@ dependencies = [
 
 [[package]]
 name = "env_logger"
-version = "0.7.1"
+version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44533bbbb3bb3c1fa17d9f2e4e38bbbaf8396ba82193c4cb1b6445d711445d36"
+checksum = "a19187fea3ac7e84da7dacf48de0c45d63c6a76f9490dae389aead16c243fce3"
 dependencies = [
  "atty",
- "humantime",
+ "humantime 2.1.0",
  "log",
  "regex",
  "termcolor",
@@ -365,10 +378,10 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa4da3c766cd7a0db8242e326e9e4e081edd567072893ed320008189715366a4"
 dependencies = [
- "proc-macro2 1.0.18",
- "quote 1.0.7",
- "syn 1.0.34",
- "synstructure 0.12.4",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
 ]
 
 [[package]]
@@ -383,7 +396,7 @@ version = "1.0.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "68c90b0fc46cf89d227cc78b40e494ff81287a92dd07631e5af0d06fe3cf885e"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "crc32fast",
  "libc",
  "miniz_oxide",
@@ -409,9 +422,9 @@ checksum = "8f5f3913fa0bfe7ee1fd8248b6b9f42a5af4b9d65ec2dd2c3c26132b950ecfc2"
 
 [[package]]
 name = "generic-array"
-version = "0.9.0"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef25c5683767570c2bbd7deba372926a55eaae9982d7726ee2a1050239d45b9d"
+checksum = "6d00328cedcac5e81c683e5620ca6a30756fc23027ebf9bff405c0e8da1fbb7e"
 dependencies = [
  "typenum",
 ]
@@ -422,7 +435,7 @@ version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7abc8dd8451921606d809ba32e95b6111925cd2906060d2dcc29c070220503eb"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "libc",
  "wasi",
 ]
@@ -441,13 +454,13 @@ checksum = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
 
 [[package]]
 name = "grin_chain"
-version = "4.2.0-alpha.1"
+version = "5.0.0-alpha.1"
 dependencies = [
  "bit-vec",
  "bitflags 1.2.1",
  "byteorder",
  "chrono",
- "croaring-mw",
+ "croaring",
  "enum_primitive",
  "failure",
  "failure_derive",
@@ -464,12 +477,14 @@ dependencies = [
 
 [[package]]
 name = "grin_core"
-version = "4.2.0-alpha.1"
+version = "5.0.0-alpha.1"
 dependencies = [
  "blake2-rfc",
  "byteorder",
+ "bytes",
  "chrono",
- "croaring-mw",
+ "croaring",
+ "digest",
  "enum_primitive",
  "failure",
  "failure_derive",
@@ -483,13 +498,14 @@ dependencies = [
  "rand 0.6.5",
  "serde",
  "serde_derive",
+ "sha2",
  "siphasher",
- "zeroize 1.1.0",
+ "zeroize",
 ]
 
 [[package]]
 name = "grin_keychain"
-version = "4.2.0-alpha.1"
+version = "5.0.0-alpha.1"
 dependencies = [
  "blake2-rfc",
  "byteorder",
@@ -505,12 +521,12 @@ dependencies = [
  "serde_derive",
  "serde_json",
  "sha2",
- "zeroize 1.1.0",
+ "zeroize",
 ]
 
 [[package]]
 name = "grin_pool"
-version = "4.2.0-alpha.1"
+version = "5.0.0-alpha.1"
 dependencies = [
  "blake2-rfc",
  "chrono",
@@ -540,9 +556,9 @@ dependencies = [
 
 [[package]]
 name = "grin_secp256k1zkp"
-version = "0.7.9"
+version = "0.7.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4c2e7431d1999f02112c2383c9d33e7a6212947abfba92c87ab7283ba667a8b"
+checksum = "3af3c4c4829b3e2e7ee1d9a542833e4244912fbb887fabe44682558159b068a7"
 dependencies = [
  "arrayvec 0.3.25",
  "cc",
@@ -551,15 +567,15 @@ dependencies = [
  "rustc-serialize",
  "serde",
  "serde_json",
- "zeroize 0.9.3",
+ "zeroize",
 ]
 
 [[package]]
 name = "grin_store"
-version = "4.2.0-alpha.1"
+version = "5.0.0-alpha.1"
 dependencies = [
  "byteorder",
- "croaring-mw",
+ "croaring",
  "failure",
  "failure_derive",
  "grin_core",
@@ -575,7 +591,7 @@ dependencies = [
 
 [[package]]
 name = "grin_util"
-version = "4.2.0-alpha.1"
+version = "5.0.0-alpha.1"
 dependencies = [
  "backtrace",
  "base64 0.12.3",
@@ -589,7 +605,7 @@ dependencies = [
  "serde",
  "serde_derive",
  "walkdir",
- "zeroize 1.1.0",
+ "zeroize",
  "zip",
 ]
 
@@ -621,6 +637,12 @@ dependencies = [
  "quick-error",
 ]
 
+[[package]]
+name = "humantime"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
+
 [[package]]
 name = "itoa"
 version = "0.4.6"
@@ -667,11 +689,11 @@ dependencies = [
 
 [[package]]
 name = "libloading"
-version = "0.5.2"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2b111a074963af1d37a139918ac6d49ad1d0d5e47f72fd55388619691a7d753"
+checksum = "efbc0f03f9a775e9f6aed295c6a1ba2253c5757a9e03d55c6caa46a681abcddd"
 dependencies = [
- "cc",
+ "cfg-if 1.0.0",
  "winapi",
 ]
 
@@ -708,7 +730,7 @@ version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "serde",
 ]
 
@@ -728,7 +750,7 @@ dependencies = [
  "chrono",
  "flate2",
  "fnv",
- "humantime",
+ "humantime 1.3.0",
  "libc",
  "log",
  "log-mdc",
@@ -785,9 +807,9 @@ checksum = "72ef4a56884ca558e5ddb05a1d1e7e1bfd9a68d9ed024c21704cc98872dae1bb"
 
 [[package]]
 name = "nom"
-version = "4.2.3"
+version = "5.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2ad2a91a8e869eeb30b9cb3119ae87773a8f4ae617f41b1eb9c154b2905f7bd6"
+checksum = "ffb4262d26ed83a1c0a33a38fe2bb15797329c85770da05e6b828ddb782627af"
 dependencies = [
  "memchr",
  "version_check",
@@ -916,7 +938,7 @@ version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d58c7c768d4ba344e3e8d72518ac13e259d7c7ade24167003b8488e10b6740a3"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "cloudabi",
  "libc",
  "redox_syscall",
@@ -946,12 +968,6 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "19b17cddbe7ec3f8bc800887bab5e717348c95ea2ca0b1bf0837fb964dc67099"
 
-[[package]]
-name = "podio"
-version = "0.1.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b18befed8bc2b61abc79a457295e7e838417326da1586050b919414073977f19"
-
 [[package]]
 name = "ppv-lite86"
 version = "0.2.8"
@@ -960,20 +976,11 @@ checksum = "237a5ed80e274dbc66f86bd59c1e25edc039660be53194b5fe0a482e0f2612ea"
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.30"
+version = "1.0.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
+checksum = "c54b25569025b7fc9651de43004ae593a75ad88543b17178aa5e1b9c4f15f56f"
 dependencies = [
- "unicode-xid 0.1.0",
-]
-
-[[package]]
-name = "proc-macro2"
-version = "1.0.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "beae6331a816b1f65d04c45b078fd8e6c93e8071771f41b8163255bbd8d7c8fa"
-dependencies = [
- "unicode-xid 0.2.1",
+ "unicode-ident",
 ]
 
 [[package]]
@@ -982,22 +989,13 @@ version = "1.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
 
-[[package]]
-name = "quote"
-version = "0.6.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ce23b6b870e8f94f81fb0a363d65d86675884b34a09043c81e5562f11c1f8e1"
-dependencies = [
- "proc-macro2 0.4.30",
-]
-
 [[package]]
 name = "quote"
 version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
 dependencies = [
- "proc-macro2 1.0.18",
+ "proc-macro2",
 ]
 
 [[package]]
@@ -1283,9 +1281,9 @@ version = "1.0.114"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0be94b04690fbaed37cddffc5c134bf537c8e3329d53e982fe04c374978f8e"
 dependencies = [
- "proc-macro2 1.0.18",
- "quote 1.0.7",
- "syn 1.0.34",
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]
@@ -1355,36 +1353,13 @@ checksum = "171758edb47aa306a78dfa4ab9aeb5167405bd4e3dc2b64e88f6a84bbe98bd63"
 
 [[package]]
 name = "syn"
-version = "0.15.44"
+version = "1.0.96"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ca4b3b69a77cbe1ffc9e198781b7acb0c7365a883670e8f1c1bc66fba79a5c5"
+checksum = "0748dd251e24453cb8717f0354206b91557e4ec8703673a4b30208f2abaf1ebf"
 dependencies = [
- "proc-macro2 0.4.30",
- "quote 0.6.13",
- "unicode-xid 0.1.0",
-]
-
-[[package]]
-name = "syn"
-version = "1.0.34"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "936cae2873c940d92e697597c5eee105fb570cd5689c695806f672883653349b"
-dependencies = [
- "proc-macro2 1.0.18",
- "quote 1.0.7",
- "unicode-xid 0.2.1",
-]
-
-[[package]]
-name = "synstructure"
-version = "0.10.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "02353edf96d6e4dc81aea2d8490a7e9db177bf8acb0e951c24940bf866cb313f"
-dependencies = [
- "proc-macro2 0.4.30",
- "quote 0.6.13",
- "syn 0.15.44",
- "unicode-xid 0.1.0",
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
 ]
 
 [[package]]
@@ -1393,10 +1368,10 @@ version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b834f2d66f734cb897113e34aaff2f1ab4719ca946f9a7358dba8f8064148701"
 dependencies = [
- "proc-macro2 1.0.18",
- "quote 1.0.7",
- "syn 1.0.34",
- "unicode-xid 0.2.1",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unicode-xid",
 ]
 
 [[package]]
@@ -1405,7 +1380,7 @@ version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "libc",
  "rand 0.7.3",
  "redox_syscall",
@@ -1431,6 +1406,26 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd829fe32373d27f76265620b5309d0340cb8550f523c1dda251d6298069069a"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0396bc89e626244658bef819e22d0cc459e795a5ebe878e6ec336d1674a8d79a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "thread-id"
 version = "3.3.0"
@@ -1483,16 +1478,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "373c8a200f9e67a0c95e62a4f52fbf80c23b4381c05a17845531982fa99e6b33"
 
 [[package]]
-name = "unicode-width"
-version = "0.1.8"
+name = "unicode-ident"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
+checksum = "d22af068fba1eb5edcb4aea19d382b2a3deb4c8f9d475c589b6ada9e0fd493ee"
 
 [[package]]
-name = "unicode-xid"
-version = "0.1.0"
+name = "unicode-width"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
+checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
 
 [[package]]
 name = "unicode-xid"
@@ -1517,9 +1512,9 @@ checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
 
 [[package]]
 name = "version_check"
-version = "0.1.5"
+version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
 [[package]]
 name = "walkdir"
@@ -1587,34 +1582,13 @@ dependencies = [
  "linked-hash-map",
 ]
 
-[[package]]
-name = "zeroize"
-version = "0.9.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "45af6a010d13e4cf5b54c94ba5a2b2eba5596b9e46bf5875612d332a1f2b3f86"
-dependencies = [
- "zeroize_derive 0.9.3",
-]
-
 [[package]]
 name = "zeroize"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3cbac2ed2ba24cc90f5e06485ac8c7c1e5449fe8911aef4d8877218af021a5b8"
 dependencies = [
- "zeroize_derive 1.0.0",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "0.9.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "080616bd0e31f36095288bb0acdf1f78ef02c2fa15527d7e993f2a6c7591643e"
-dependencies = [
- "proc-macro2 0.4.30",
- "quote 0.6.13",
- "syn 0.15.44",
- "synstructure 0.10.2",
+ "zeroize_derive",
 ]
 
 [[package]]
@@ -1623,18 +1597,19 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "de251eec69fc7c1bc3923403d18ececb929380e016afe103da75f396704f8ca2"
 dependencies = [
- "proc-macro2 1.0.18",
- "quote 1.0.7",
- "syn 1.0.34",
- "synstructure 0.12.4",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
 ]
 
 [[package]]
 name = "zip"
-version = "0.5.6"
+version = "0.5.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "58287c28d78507f5f91f2a4cf1e8310e2c76fd4c6932f93ac60fd1ceb402db7d"
+checksum = "93ab48844d61251bb3835145c521d88aa4031d7139e8485990f60ca911fa0815"
 dependencies = [
+ "byteorder",
  "crc32fast",
- "podio",
+ "thiserror",
 ]