diff --git a/Cargo.lock b/Cargo.lock
index e3fd935..e588b80 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -10,18 +10,32 @@ checksum = "fe438c63458706e03479442743baae6c88256498e6431708f6dfc520a26515d3"
 
 [[package]]
 name = "ahash"
-version = "0.4.7"
+version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "739f4a8db6605981345c5654f3a85b056ce52f37a39d34da03f25bf2151ea16e"
+checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
+dependencies = [
+ "getrandom 0.2.7",
+ "once_cell",
+ "version_check",
+]
 
 [[package]]
-name = "aho-corasick"
-version = "0.7.18"
+name = "arrayref"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
-dependencies = [
- "memchr",
-]
+checksum = "a4c527152e37cf757a3f78aae5a06fbeefdb07ccc535c980a3208ee3060dd544"
+
+[[package]]
+name = "arrayvec"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
+
+[[package]]
+name = "arrayvec"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8da52d66c7071e2e3fa2a1e5c6d088fec47b593032b254f5e980de8ea54454d6"
 
 [[package]]
 name = "autocfg"
@@ -29,12 +43,41 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "base64"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b41b7ea54a0c9d92199de89e20e58d49f02f8e699814ef3fdf266f6f748d15c7"
+
 [[package]]
 name = "base64"
 version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
 
+[[package]]
+name = "bitvec"
+version = "0.20.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7774144344a4faa177370406a7ff5f1da24303817368584c6206c8303eb07848"
+dependencies = [
+ "funty",
+ "radium",
+ "tap",
+ "wyz",
+]
+
+[[package]]
+name = "blake2"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0a4e37d16930f5459780f5621038b6382b9bb37c19016f39fb6b5808d831f174"
+dependencies = [
+ "crypto-mac",
+ "digest 0.9.0",
+ "opaque-debug",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.9.0"
@@ -45,6 +88,15 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "block-buffer"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0bf7fe51849ea569fd452f37822f606a5cabb684dc918707a0193fd4664ff324"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "block-padding"
 version = "0.2.1"
@@ -53,32 +105,32 @@ checksum = "8d696c370c750c948ada61c69a0ee2cbbb9c50b1019ddb86d9317157a99c2cae"
 
 [[package]]
 name = "borsh"
-version = "0.8.2"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09a7111f797cc721407885a323fb071636aee57f750b1a4ddc27397eba168a74"
+checksum = "15bf3650200d8bffa99015595e10f1fbd17de07abbc25bb067da79e769939bfa"
 dependencies = [
  "borsh-derive",
- "hashbrown 0.9.1",
+ "hashbrown",
 ]
 
 [[package]]
 name = "borsh-derive"
-version = "0.8.2"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "307f3740906bac2c118a8122fe22681232b244f1369273e45f1156b45c43d2dd"
+checksum = "6441c552f230375d18e3cc377677914d2ca2b0d36e52129fe15450a2dce46775"
 dependencies = [
  "borsh-derive-internal",
  "borsh-schema-derive-internal",
- "proc-macro-crate",
+ "proc-macro-crate 0.1.5",
  "proc-macro2",
  "syn",
 ]
 
 [[package]]
 name = "borsh-derive-internal"
-version = "0.8.2"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2104c73179359431cc98e016998f2f23bc7a05bc53e79741bcba705f30047bc"
+checksum = "5449c28a7b352f2d1e592a8a28bf139bc71afb0764a14f3c02500935d8c44065"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -87,9 +139,9 @@ dependencies = [
 
 [[package]]
 name = "borsh-schema-derive-internal"
-version = "0.8.2"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae29eb8418fcd46f723f8691a2ac06857d31179d33d2f2d91eb13967de97c728"
+checksum = "cdbd5696d8bfa21d53d9fe39a714a18538bad11492a42d066dbbc395fb1951c0"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -102,12 +154,40 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "771fe0050b883fcc3ea2359b1a96bcfbc090b7116eae7c3c512c7a083fdf23d3"
 
+[[package]]
+name = "byte-slice-cast"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87c5fdd0166095e1d463fc6cc01aa8ce547ad77a4e84d42eb6762b084e28067e"
+
 [[package]]
 name = "byteorder"
 version = "1.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
 
+[[package]]
+name = "bytesize"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c58ec36aac5066d5ca17df51b3e70279f5670a72102f5752cb7e7c856adfc70"
+
+[[package]]
+name = "c2-chacha"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d27dae93fe7b1e0424dc57179ac396908c26b035a87234809f5c4dfd1b47dc80"
+dependencies = [
+ "cipher",
+ "ppv-lite86",
+]
+
+[[package]]
+name = "cc"
+version = "1.0.73"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2fff2a6927b3bb87f9595d67196a70493f627687a71d87a0d692242c33f58c11"
+
 [[package]]
 name = "cfg-if"
 version = "0.1.10"
@@ -120,6 +200,29 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "chrono"
+version = "0.4.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "670ad68c9088c2a963aaa298cb369688cf3f9465ce5e2d4ca10e6e0098a1ce73"
+dependencies = [
+ "libc",
+ "num-integer",
+ "num-traits",
+ "serde",
+ "time",
+ "winapi",
+]
+
+[[package]]
+name = "cipher"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12f8e7987cbd042a63249497f41aed09f8e65add917ea6566effbc56578d6801"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "convert_case"
 version = "0.4.0"
@@ -135,6 +238,45 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "crunchy"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a81dae078cea95a014a339291cec439d2f232ebe854a9d672b796c6afafa9b7"
+
+[[package]]
+name = "crypto-common"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57952ca27b5e3606ff4dd79b0020231aaf9d6aa76dc05fd30137538c50bd3ce8"
+dependencies = [
+ "generic-array",
+ "typenum",
+]
+
+[[package]]
+name = "crypto-mac"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b584a330336237c1eecd3e94266efb216c56ed91225d634cb2991c5f3fd1aeab"
+dependencies = [
+ "generic-array",
+ "subtle",
+]
+
+[[package]]
+name = "curve25519-dalek"
+version = "3.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90f9d052967f590a76e62eb387bd0bbb1b000182c3cefe5364db6b7211651bc0"
+dependencies = [
+ "byteorder",
+ "digest 0.9.0",
+ "rand_core 0.5.1",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "derive_more"
 version = "0.99.17"
@@ -157,6 +299,63 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "digest"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2fb860ca6fafa5552fb6d0e816a69c8e49f0908bf524e30a90d97c85892d506"
+dependencies = [
+ "block-buffer 0.10.2",
+ "crypto-common",
+]
+
+[[package]]
+name = "easy-ext"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53aff6fdc1b181225acdcb5b14c47106726fd8e486707315b1b138baed68ee31"
+
+[[package]]
+name = "ed25519"
+version = "1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e9c280362032ea4203659fc489832d0204ef09f247a0506f170dafcac08c369"
+dependencies = [
+ "signature",
+]
+
+[[package]]
+name = "ed25519-dalek"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+dependencies = [
+ "curve25519-dalek",
+ "ed25519",
+ "rand 0.7.3",
+ "serde",
+ "sha2 0.9.9",
+ "zeroize",
+]
+
+[[package]]
+name = "fixed-hash"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfcf0ed7fe52a17a03854ec54a9f76d6d84508d1c0e66bc1793301c73fc8493c"
+dependencies = [
+ "byteorder",
+ "rand 0.8.5",
+ "rustc-hex",
+ "static_assertions",
+]
+
+[[package]]
+name = "funty"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fed34cd105917e91daa4da6b3728c47b068749d6a62c59811f06ed2ac71d9da7"
+
 [[package]]
 name = "generic-array"
 version = "0.14.5"
@@ -168,12 +367,25 @@ dependencies = [
 ]
 
 [[package]]
-name = "hashbrown"
-version = "0.9.1"
+name = "getrandom"
+version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d7afe4a420e3fe79967a00898cc1f4db7c8a49a9333a29f8a4bd76a253d5cd04"
+checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
 dependencies = [
- "ahash",
+ "cfg-if 1.0.0",
+ "libc",
+ "wasi 0.9.0+wasi-snapshot-preview1",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4eb1a864a501629691edf6c15a593b7a51eebaa1e8468e9ddc623de7c9b58ec6"
+dependencies = [
+ "cfg-if 1.0.0",
+ "libc",
+ "wasi 0.11.0+wasi-snapshot-preview1",
 ]
 
 [[package]]
@@ -181,6 +393,15 @@ name = "hashbrown"
 version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
+dependencies = [
+ "ahash",
+]
+
+[[package]]
+name = "heck"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2540771e65fc8cb83cd6e8a237f70c319bd5c29f78ed1084ba5d50eeac86f7f9"
 
 [[package]]
 name = "hex"
@@ -189,13 +410,23 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
 [[package]]
-name = "indexmap"
-version = "1.8.1"
+name = "impl-codec"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0f647032dfaa1f8b6dc29bd3edb7bbef4861b8b8007ebb118d6db284fd59f6ee"
+checksum = "161ebdfec3c8e3b52bf61c4f3550a1eea4f9579d10dc1b936f3171ebdcd6c443"
 dependencies = [
- "autocfg",
- "hashbrown 0.11.2",
+ "parity-scale-codec",
+]
+
+[[package]]
+name = "impl-trait-for-tuples"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "11d7a9f6330b71fea57921c9b61c47ee6e84f72d394754eff6163ae67e7395eb"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]
@@ -210,24 +441,12 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "67c21572b4949434e4fc1e1978b99c5f77064153c59d998bf13ecd96fb5ecba7"
 
-[[package]]
-name = "lazy_static"
-version = "1.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
-
 [[package]]
 name = "libc"
 version = "0.2.125"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5916d2ae698f6de9bfb891ad7a8d65c09d232dc58cc4ac433c7da3b2fd84bc2b"
 
-[[package]]
-name = "memchr"
-version = "2.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
-
 [[package]]
 name = "memory_units"
 version = "0.4.0"
@@ -235,71 +454,124 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8452105ba047068f40ff7093dd1d9da90898e63dd61736462e9cdda6a90ad3c3"
 
 [[package]]
-name = "near-primitives-core"
-version = "0.4.0"
+name = "near-account-id"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c2b3fb5acf3a494aed4e848446ef2d6ebb47dbe91c681105d4d1786c2ee63e52"
+checksum = "de83d74a9241be8cc4eb3055216966b58bf8c463e8e285c0dc553925acdd19fa"
 dependencies = [
- "base64",
+ "borsh",
+ "serde",
+]
+
+[[package]]
+name = "near-crypto"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8ecf0b8b31aa7f4e60f629f72213a2617ca4a5f45cd1ae9ed2cf7cecfebdbb7"
+dependencies = [
+ "arrayref",
+ "blake2",
  "borsh",
  "bs58",
+ "c2-chacha",
+ "curve25519-dalek",
+ "derive_more",
+ "ed25519-dalek",
+ "libc",
+ "near-account-id",
+ "once_cell",
+ "parity-secp256k1",
+ "primitive-types",
+ "rand 0.7.3",
+ "rand_core 0.5.1",
+ "serde",
+ "serde_json",
+ "subtle",
+ "thiserror",
+]
+
+[[package]]
+name = "near-primitives"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0a2ba19282e79a4485a77736b679d276b09870bbf8042a18e0f0ae36347489c5"
+dependencies = [
+ "borsh",
+ "byteorder",
+ "bytesize",
+ "chrono",
  "derive_more",
+ "easy-ext",
  "hex",
- "lazy_static",
+ "near-crypto",
+ "near-primitives-core",
+ "near-rpc-error-macro",
+ "near-vm-errors",
  "num-rational",
+ "once_cell",
+ "primitive-types",
+ "rand 0.7.3",
+ "reed-solomon-erasure",
  "serde",
  "serde_json",
- "sha2",
+ "smart-default",
+ "strum",
+ "thiserror",
 ]
 
 [[package]]
-name = "near-rpc-error-core"
-version = "0.1.0"
+name = "near-primitives-core"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ffa8dbf8437a28ac40fcb85859ab0d0b8385013935b000c7a51ae79631dd74d9"
+checksum = "bb561feb392bb8c4f540256073446e6689af087bf6356e8dddcf75fc279f201f"
 dependencies = [
- "proc-macro2",
- "quote",
+ "base64 0.11.0",
+ "borsh",
+ "bs58",
+ "derive_more",
+ "near-account-id",
+ "num-rational",
  "serde",
- "serde_json",
- "syn",
+ "sha2 0.10.2",
+ "strum",
 ]
 
 [[package]]
-name = "near-rpc-error-macro"
-version = "0.1.0"
+name = "near-rpc-error-core"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c6111d713e90c7c551dee937f4a06cb9ea2672243455a4454cc7566387ba2d9"
+checksum = "77fdd7ea8d8f786878651c37691515d5053f827ae60894aa40c16882b78f77c9"
 dependencies = [
- "near-rpc-error-core",
- "proc-macro2",
  "quote",
  "serde",
- "serde_json",
  "syn",
 ]
 
 [[package]]
-name = "near-runtime-utils"
-version = "4.0.0-pre.1"
+name = "near-rpc-error-macro"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a48d80c4ca1d4cf99bc16490e1e3d49826c150dfc4410ac498918e45c7d98e07"
+checksum = "e521842b6ae864dfe5391afbbe2df9e9d8427c26e9333b2e0b65cd42094f7607"
 dependencies = [
- "lazy_static",
- "regex",
+ "near-rpc-error-core",
+ "serde",
+ "syn",
 ]
 
 [[package]]
 name = "near-sdk"
-version = "3.1.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c7383e242d3e07bf0951e8589d6eebd7f18bb1c1fc5fbec3fad796041a6aebd1"
+checksum = "bda34e06e28fb9a09ac54efbdc49f0c9308780fc932aaa81c49c493fde974045"
 dependencies = [
- "base64",
+ "base64 0.13.0",
  "borsh",
  "bs58",
+ "near-crypto",
+ "near-primitives",
  "near-primitives-core",
  "near-sdk-macros",
+ "near-sys",
  "near-vm-logic",
  "serde",
  "serde_json",
@@ -307,10 +579,10 @@ dependencies = [
 ]
 
 [[package]]
-name = "near-sdk-core"
-version = "3.1.0"
+name = "near-sdk-macros"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "284a78d9eb8eda58330462fa0023a6d7014c941df1f0387095e7dfd1dc0f2bce"
+checksum = "72064fcc15a623a0d40a6c199ea5cbdc30a83cae4816889d46f218acf31bfba8"
 dependencies = [
  "Inflector",
  "proc-macro2",
@@ -319,44 +591,41 @@ dependencies = [
 ]
 
 [[package]]
-name = "near-sdk-macros"
-version = "3.1.0"
+name = "near-sys"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2037337438f97d1ce5f7c896cf229dc56dacd5c01142d1ef95a7d778cde6ce7d"
-dependencies = [
- "near-sdk-core",
- "proc-macro2",
- "quote",
- "syn",
-]
+checksum = "e307313276eaeced2ca95740b5639e1f3125b7c97f0a1151809d105f1aa8c6d3"
 
 [[package]]
 name = "near-vm-errors"
-version = "4.0.0-pre.1"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e281d8730ed8cb0e3e69fb689acee6b93cdb43824cd69a8ffd7e1bfcbd1177d7"
+checksum = "0e02faf2bc1f6ef82b965cfe44389808fb5594f7aca4b596766117f4ce74df20"
 dependencies = [
  "borsh",
- "hex",
+ "near-account-id",
  "near-rpc-error-macro",
  "serde",
 ]
 
 [[package]]
 name = "near-vm-logic"
-version = "4.0.0-pre.1"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e11cb28a2d07f37680efdaf860f4c9802828c44fc50c08009e7884de75d982c5"
+checksum = "f024d90451cd3c24d7a0a5cabf3636b192a60eb8e3ff0456f6c18b91152c346d"
 dependencies = [
- "base64",
+ "base64 0.13.0",
  "borsh",
  "bs58",
  "byteorder",
+ "near-account-id",
+ "near-crypto",
+ "near-primitives",
  "near-primitives-core",
- "near-runtime-utils",
  "near-vm-errors",
+ "ripemd",
  "serde",
- "sha2",
+ "sha2 0.9.9",
  "sha3",
 ]
 
@@ -403,12 +672,73 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "once_cell"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7709cef83f0c1f58f666e746a08b21e0085f7440fa6a29cc194d68aac97a4225"
+
 [[package]]
 name = "opaque-debug"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 
+[[package]]
+name = "parity-scale-codec"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "373b1a4c1338d9cd3d1fa53b3a11bdab5ab6bd80a20f7f7becd76953ae2be909"
+dependencies = [
+ "arrayvec 0.7.2",
+ "bitvec",
+ "byte-slice-cast",
+ "impl-trait-for-tuples",
+ "parity-scale-codec-derive",
+ "serde",
+]
+
+[[package]]
+name = "parity-scale-codec-derive"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1557010476e0595c9b568d16dcfb81b93cdeb157612726f5170d31aa707bed27"
+dependencies = [
+ "proc-macro-crate 1.1.3",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "parity-secp256k1"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fca4f82fccae37e8bbdaeb949a4a218a1bbc485d11598f193d2a908042e5fc1"
+dependencies = [
+ "arrayvec 0.5.2",
+ "cc",
+ "cfg-if 0.1.10",
+ "rand 0.7.3",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
+
+[[package]]
+name = "primitive-types"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05e4722c697a58a99d5d06a08c30821d7c082a4632198de1eaa5a6c22ef42373"
+dependencies = [
+ "fixed-hash",
+ "impl-codec",
+ "uint",
+]
+
 [[package]]
 name = "proc-macro-crate"
 version = "0.1.5"
@@ -418,6 +748,16 @@ dependencies = [
  "toml",
 ]
 
+[[package]]
+name = "proc-macro-crate"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e17d47ce914bf4de440332250b0edd23ce48c005f59fab39d3335866b114f11a"
+dependencies = [
+ "thiserror",
+ "toml",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.37"
@@ -437,21 +777,105 @@ dependencies = [
 ]
 
 [[package]]
-name = "regex"
-version = "1.5.5"
+name = "radium"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "643f8f41a8ebc4c5dc4515c82bb8abd397b527fc20fd681b7c011c2aee5d44fb"
+
+[[package]]
+name = "rand"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+dependencies = [
+ "getrandom 0.1.16",
+ "libc",
+ "rand_chacha 0.2.2",
+ "rand_core 0.5.1",
+ "rand_hc",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha 0.3.1",
+ "rand_core 0.6.3",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.5.1",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a11647b6b25ff05a515cb92c365cec08801e83423a235b51e231e1808747286"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
- "aho-corasick",
- "memchr",
- "regex-syntax",
+ "ppv-lite86",
+ "rand_core 0.6.3",
 ]
 
 [[package]]
-name = "regex-syntax"
-version = "0.6.25"
+name = "rand_core"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
+checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
+dependencies = [
+ "getrandom 0.1.16",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d34f1408f55294453790c48b2f1ebbb1c5b4b7563eb1f418bcfcfdbb06ebb4e7"
+dependencies = [
+ "getrandom 0.2.7",
+]
+
+[[package]]
+name = "rand_hc"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
+dependencies = [
+ "rand_core 0.5.1",
+]
+
+[[package]]
+name = "reed-solomon-erasure"
+version = "4.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a415a013dd7c5d4221382329a5a3482566da675737494935cbbbcdec04662f9d"
+dependencies = [
+ "smallvec",
+]
+
+[[package]]
+name = "ripemd"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1facec54cb5e0dc08553501fa740091086d0259ad0067e0d4103448e4cb22ed3"
+dependencies = [
+ "digest 0.10.3",
+]
+
+[[package]]
+name = "rustc-hex"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e75f6a532d0fd9f7f13144f392b6ad56a32696bfcd9c78f797f16bbb6f072d6"
 
 [[package]]
 name = "rustc_version"
@@ -462,6 +886,12 @@ dependencies = [
  "semver",
 ]
 
+[[package]]
+name = "rustversion"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a0a5f7c728f5d284929a1cccb5bc19884422bfe6ef4d6c409da2c41838983fcf"
+
 [[package]]
 name = "ryu"
 version = "1.0.9"
@@ -500,7 +930,6 @@ version = "1.0.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b7ce2b32a1aed03c558dc61a5cd328f15aff2dbc17daad8fb8af04d2100e15c"
 dependencies = [
- "indexmap",
  "itoa",
  "ryu",
  "serde",
@@ -512,25 +941,65 @@ version = "0.9.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
 dependencies = [
- "block-buffer",
+ "block-buffer 0.9.0",
  "cfg-if 1.0.0",
  "cpufeatures",
- "digest",
+ "digest 0.9.0",
  "opaque-debug",
 ]
 
+[[package]]
+name = "sha2"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55deaec60f81eefe3cce0dc50bda92d6d8e88f2a27df7c5033b42afeb1ed2676"
+dependencies = [
+ "cfg-if 1.0.0",
+ "cpufeatures",
+ "digest 0.10.3",
+]
+
 [[package]]
 name = "sha3"
 version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f81199417d4e5de3f04b1e871023acea7389672c4135918f05aa9cbf2f2fa809"
 dependencies = [
- "block-buffer",
- "digest",
+ "block-buffer 0.9.0",
+ "digest 0.9.0",
  "keccak",
  "opaque-debug",
 ]
 
+[[package]]
+name = "signature"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f054c6c1a6e95179d6f23ed974060dcefb2d9388bb7256900badad682c499de4"
+
+[[package]]
+name = "smallvec"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
+
+[[package]]
+name = "smart-default"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "133659a15339456eeeb07572eb02a91c91e9815e9cbc89566944d2c8d3efdbf6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
 [[package]]
 name = "status-message"
 version = "0.1.0"
@@ -540,6 +1009,34 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "strum"
+version = "0.24.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "063e6045c0e62079840579a7e47a355ae92f60eb74daaf156fb1e84ba164e63f"
+dependencies = [
+ "strum_macros",
+]
+
+[[package]]
+name = "strum_macros"
+version = "0.24.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6878079b17446e4d3eba6192bb0a2950d5b14f0ed8424b852310e5a94345d0ef"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "rustversion",
+ "syn",
+]
+
+[[package]]
+name = "subtle"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
+
 [[package]]
 name = "syn"
 version = "1.0.57"
@@ -551,6 +1048,55 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "synstructure"
+version = "0.12.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f36bdaa60a83aca3921b5259d5400cbf5e90fc51931376a9bd4a0eb79aa7210f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unicode-xid",
+]
+
+[[package]]
+name = "tap"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
+
+[[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 = "time"
+version = "0.1.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6db9e6914ab8b1ae1c260a4ae7a49b6c5611b40328a735b21862567685e73255"
+dependencies = [
+ "libc",
+ "wasi 0.10.0+wasi-snapshot-preview1",
+ "winapi",
+]
+
 [[package]]
 name = "toml"
 version = "0.5.9"
@@ -566,6 +1112,18 @@ version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dcf81ac59edc17cc8697ff311e8f5ef2d99fcbd9817b34cec66f90b6c3dfd987"
 
+[[package]]
+name = "uint"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12f03af7ccf01dd611cc450a0d10dbc9b745770d096473e2faf0ca6e2d66d1e0"
+dependencies = [
+ "byteorder",
+ "crunchy",
+ "hex",
+ "static_assertions",
+]
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.3"
@@ -578,6 +1136,24 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
+[[package]]
+name = "wasi"
+version = "0.9.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+
+[[package]]
+name = "wasi"
+version = "0.10.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
 [[package]]
 name = "wee_alloc"
 version = "0.4.5"
@@ -611,3 +1187,30 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "wyz"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214"
+
+[[package]]
+name = "zeroize"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4756f7db3f7b5574938c3eb1c117038b8e07f95ee6718c0efad4ac21508f1efd"
+dependencies = [
+ "zeroize_derive",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f8f187641dad4f680d25c4bfc4225b418165984179f26ca76ec4fb6441d3a17"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
diff --git a/Cargo.toml b/Cargo.toml
index ece18b2..d64206d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ crate-type = ["cdylib", "rlib"]
 [dependencies]
 serde = { version = "*", features = ["derive"] }
 serde_json = "*"
-near-sdk = "3.1.0"
+near-sdk = "4.0.0"
 
 [profile.release]
 codegen-units = 1
diff --git a/src/lib.rs b/src/lib.rs
index 558681e..13f3ec6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,13 +1,11 @@
 use near_sdk::borsh::{self, BorshDeserialize, BorshSerialize};
 use near_sdk::collections::LookupMap;
-use near_sdk::{env, near_bindgen};
-
-near_sdk::setup_alloc!();
+use near_sdk::{env, near_bindgen, AccountId};
 
 #[near_bindgen]
 #[derive(BorshDeserialize, BorshSerialize)]
 pub struct StatusMessage {
-    records: LookupMap<String, String>,
+    records: LookupMap<AccountId, String>,
 }
 
 impl Default for StatusMessage {
@@ -25,7 +23,7 @@ impl StatusMessage {
         self.records.insert(&account_id, &message);
     }
 
-    pub fn get_status(&self, account_id: String) -> Option<String> {
+    pub fn get_status(&self, account_id: AccountId) -> Option<String> {
         return self.records.get(&account_id);
     }
 }
@@ -33,48 +31,43 @@ impl StatusMessage {
 #[cfg(not(target_arch = "wasm32"))]
 #[cfg(test)]
 mod tests {
+    use near_sdk::test_utils::{accounts, VMContextBuilder};
+    use near_sdk::{testing_env};
+
     use super::*;
-    use near_sdk::MockedBlockchain;
-    use near_sdk::{testing_env, VMContext};
 
-    fn get_context(input: Vec<u8>, is_view: bool) -> VMContext {
-        VMContext {
-            current_account_id: "alice_near".to_string(),
-            signer_account_id: "bob_near".to_string(),
-            signer_account_pk: vec![0, 1, 2],
-            predecessor_account_id: "carol_near".to_string(),
-            input,
-            block_index: 0,
-            block_timestamp: 0,
-            account_balance: 0,
-            account_locked_balance: 0,
-            storage_usage: 0,
-            attached_deposit: 0,
-            prepaid_gas: 10u64.pow(18),
-            random_seed: vec![0, 1, 2],
-            is_view,
-            output_data_receivers: vec![],
-            epoch_height: 0,
-        }
+    // Allows for modifying the environment of the mocked blockchain
+    fn get_context(predecessor_account_id: AccountId) -> VMContextBuilder {
+        let mut builder = VMContextBuilder::new();
+        builder
+            .current_account_id(accounts(0))
+            .signer_account_id(predecessor_account_id.clone())
+            .predecessor_account_id(predecessor_account_id);
+        builder
     }
 
     #[test]
     fn set_get_message() {
-        let context = get_context(vec![], false);
-        testing_env!(context);
+        let mut context = get_context(accounts(1));
+        // Initialize the mocked blockchain
+        testing_env!(context.build());
+
+        // Set the testing environment for the subsequent calls
+        testing_env!(context
+            .predecessor_account_id(accounts(1))
+            .build());
+
         let mut contract = StatusMessage::default();
         contract.set_status("hello".to_string());
         assert_eq!(
             "hello".to_string(),
-            contract.get_status("bob_near".to_string()).unwrap()
+            contract.get_status(accounts(1)).unwrap()
         );
     }
 
     #[test]
     fn get_nonexistent_message() {
-        let context = get_context(vec![], true);
-        testing_env!(context);
         let contract = StatusMessage::default();
-        assert_eq!(None, contract.get_status("francis.near".to_string()));
+        assert_eq!(None, contract.get_status("francis.near".parse().unwrap()));
     }
 }