diff --git a/packages/hash-object/.cargo/config.toml b/packages/hash-object/.cargo/config.toml
new file mode 100644
index 00000000..e60e39be
--- /dev/null
+++ b/packages/hash-object/.cargo/config.toml
@@ -0,0 +1,7 @@
+[build]
+rustc-link-search = ["/home/cayman/Code/hashtree/src/"]
+rustc-link-lib = ["static=hashtree"]
+
+[target.x86_64-pc-windows-msvc]
+rustflags = ["-C", "target-feature=+crt-static"]
+
diff --git a/packages/hash-object/.github/workflows/CI.yml b/packages/hash-object/.github/workflows/CI.yml
new file mode 100644
index 00000000..07ae4017
--- /dev/null
+++ b/packages/hash-object/.github/workflows/CI.yml
@@ -0,0 +1,255 @@
+name: CI
+env:
+  DEBUG: napi:*
+  APP_NAME: hash-object
+  MACOSX_DEPLOYMENT_TARGET: '10.13'
+permissions:
+  contents: write
+  id-token: write
+'on':
+  push:
+    branches:
+      - main
+    tags-ignore:
+      - '**'
+    paths-ignore:
+      - '**/*.md'
+      - LICENSE
+      - '**/*.gitignore'
+      - .editorconfig
+      - docs/**
+  pull_request: null
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        settings:
+          - host: macos-latest
+            target: x86_64-apple-darwin
+            build: yarn build
+          - host: windows-latest
+            build: yarn build
+            target: x86_64-pc-windows-msvc
+          - host: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+            docker: ghcr.io/napi-rs/napi-rs/nodejs-rust:lts-debian
+            build: yarn build --target x86_64-unknown-linux-gnu
+          - host: macos-latest
+            target: aarch64-apple-darwin
+            build: yarn build --target aarch64-apple-darwin
+          - host: ubuntu-latest
+            target: aarch64-unknown-linux-gnu
+            docker: ghcr.io/napi-rs/napi-rs/nodejs-rust:lts-debian-aarch64
+            build: yarn build --target aarch64-unknown-linux-gnu
+    name: stable - ${{ matrix.settings.target }} - node@20
+    runs-on: ${{ matrix.settings.host }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup node
+        uses: actions/setup-node@v4
+        if: ${{ !matrix.settings.docker }}
+        with:
+          node-version: 20
+          cache: yarn
+      - name: Install
+        uses: dtolnay/rust-toolchain@stable
+        if: ${{ !matrix.settings.docker }}
+        with:
+          toolchain: stable
+          targets: ${{ matrix.settings.target }}
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            .cargo-cache
+            target/
+          key: ${{ matrix.settings.target }}-cargo-${{ matrix.settings.host }}
+      - uses: goto-bus-stop/setup-zig@v2
+        if: ${{ matrix.settings.target == 'armv7-unknown-linux-gnueabihf' }}
+        with:
+          version: 0.11.0
+      - name: Setup toolchain
+        run: ${{ matrix.settings.setup }}
+        if: ${{ matrix.settings.setup }}
+        shell: bash
+      - name: Setup node x86
+        if: matrix.settings.target == 'i686-pc-windows-msvc'
+        run: yarn config set supportedArchitectures.cpu "ia32"
+        shell: bash
+      - name: Install dependencies
+        run: yarn install
+      - name: Setup node x86
+        uses: actions/setup-node@v4
+        if: matrix.settings.target == 'i686-pc-windows-msvc'
+        with:
+          node-version: 20
+          cache: yarn
+          architecture: x86
+      - name: Build in docker
+        uses: addnab/docker-run-action@v3
+        if: ${{ matrix.settings.docker }}
+        with:
+          image: ${{ matrix.settings.docker }}
+          options: '--user 0:0 -v ${{ github.workspace }}/.cargo-cache/git/db:/usr/local/cargo/git/db -v ${{ github.workspace }}/.cargo/registry/cache:/usr/local/cargo/registry/cache -v ${{ github.workspace }}/.cargo/registry/index:/usr/local/cargo/registry/index -v ${{ github.workspace }}:/build -w /build'
+          run: ${{ matrix.settings.build }}
+      - name: Build
+        run: ${{ matrix.settings.build }}
+        if: ${{ !matrix.settings.docker }}
+        shell: bash
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: bindings-${{ matrix.settings.target }}
+          path: ${{ env.APP_NAME }}.*.node
+          if-no-files-found: error
+  test-macOS-windows-binding:
+    name: Test bindings on ${{ matrix.settings.target }} - node@${{ matrix.node }}
+    needs:
+      - build
+    strategy:
+      fail-fast: false
+      matrix:
+        settings:
+          - host: macos-latest
+            target: x86_64-apple-darwin
+          - host: windows-latest
+            target: x86_64-pc-windows-msvc
+        node:
+          - '18'
+          - '20'
+    runs-on: ${{ matrix.settings.host }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+          cache: yarn
+      - name: Install dependencies
+        run: yarn install
+      - name: Download artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: bindings-${{ matrix.settings.target }}
+          path: .
+      - name: List packages
+        run: ls -R .
+        shell: bash
+      - name: Test bindings
+        run: yarn test
+  test-linux-x64-gnu-binding:
+    name: Test bindings on Linux-x64-gnu - node@${{ matrix.node }}
+    needs:
+      - build
+    strategy:
+      fail-fast: false
+      matrix:
+        node:
+          - '18'
+          - '20'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+          cache: yarn
+      - name: Install dependencies
+        run: yarn install
+      - name: Download artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: bindings-x86_64-unknown-linux-gnu
+          path: .
+      - name: List packages
+        run: ls -R .
+        shell: bash
+      - name: Test bindings
+        run: docker run --rm -v $(pwd):/build -w /build node:${{ matrix.node }}-slim yarn test
+  test-linux-aarch64-gnu-binding:
+    name: Test bindings on aarch64-unknown-linux-gnu - node@${{ matrix.node }}
+    needs:
+      - build
+    strategy:
+      fail-fast: false
+      matrix:
+        node:
+          - '18'
+          - '20'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Download artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: bindings-aarch64-unknown-linux-gnu
+          path: .
+      - name: List packages
+        run: ls -R .
+        shell: bash
+      - name: Install dependencies
+        run: |
+          yarn config set supportedArchitectures.cpu "arm64"
+          yarn config set supportedArchitectures.libc "glibc"
+          yarn install
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: arm64
+      - run: docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+      - name: Setup and run tests
+        uses: addnab/docker-run-action@v3
+        with:
+          image: node:${{ matrix.node }}-slim
+          options: '--platform linux/arm64 -v ${{ github.workspace }}:/build -w /build'
+          run: |
+            set -e
+            yarn test
+            ls -la
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    needs:
+      - test-macOS-windows-binding
+      - test-linux-x64-gnu-binding
+      - test-linux-aarch64-gnu-binding
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: yarn
+      - name: Install dependencies
+        run: yarn install
+      - name: Download all artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: artifacts
+      - name: Move artifacts
+        run: yarn artifacts
+      - name: List packages
+        run: ls -R ./npm
+        shell: bash
+      - name: Publish
+        run: |
+          npm config set provenance true
+          if git log -1 --pretty=%B | grep "^[0-9]\+\.[0-9]\+\.[0-9]\+$";
+          then
+            echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" >> ~/.npmrc
+            npm publish --access public
+          elif git log -1 --pretty=%B | grep "^[0-9]\+\.[0-9]\+\.[0-9]\+";
+          then
+            echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" >> ~/.npmrc
+            npm publish --tag next --access public
+          else
+            echo "Not a release, skipping publish"
+          fi
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
diff --git a/packages/hash-object/.gitignore b/packages/hash-object/.gitignore
new file mode 100644
index 00000000..5e2577b3
--- /dev/null
+++ b/packages/hash-object/.gitignore
@@ -0,0 +1,197 @@
+# Created by https://www.toptal.com/developers/gitignore/api/node
+# Edit at https://www.toptal.com/developers/gitignore?templates=node
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# Next.js build output
+.next
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# End of https://www.toptal.com/developers/gitignore/api/node
+
+# Created by https://www.toptal.com/developers/gitignore/api/macos
+# Edit at https://www.toptal.com/developers/gitignore?templates=macos
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two 
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### macOS Patch ###
+# iCloud generated files
+*.icloud
+
+# End of https://www.toptal.com/developers/gitignore/api/macos
+
+# Created by https://www.toptal.com/developers/gitignore/api/windows
+# Edit at https://www.toptal.com/developers/gitignore?templates=windows
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.toptal.com/developers/gitignore/api/windows
+
+#Added by cargo
+
+/target
+Cargo.lock
+
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
+*.node
diff --git a/packages/hash-object/.npmignore b/packages/hash-object/.npmignore
new file mode 100644
index 00000000..ec144db2
--- /dev/null
+++ b/packages/hash-object/.npmignore
@@ -0,0 +1,13 @@
+target
+Cargo.lock
+.cargo
+.github
+npm
+.eslintrc
+.prettierignore
+rustfmt.toml
+yarn.lock
+*.node
+.yarn
+__test__
+renovate.json
diff --git a/packages/hash-object/.yarnrc.yml b/packages/hash-object/.yarnrc.yml
new file mode 100644
index 00000000..3186f3f0
--- /dev/null
+++ b/packages/hash-object/.yarnrc.yml
@@ -0,0 +1 @@
+nodeLinker: node-modules
diff --git a/packages/hash-object/Cargo.toml b/packages/hash-object/Cargo.toml
new file mode 100644
index 00000000..5b2ac89c
--- /dev/null
+++ b/packages/hash-object/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+edition = "2021"
+name = "hash-object"
+version = "0.0.0"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+ethereum_hashing = "0.6.0"
+# Default enable napi4 feature, see https://nodejs.org/api/n-api.html#node-api-version-matrix
+napi = { version = "2.12.2", default-features = false, features = ["napi4"] }
+napi-derive = "2.12.2"
+
+[build-dependencies]
+napi-build = "2.0.1"
+
+[profile.release]
+lto = true
+strip = "symbols"
diff --git a/packages/hash-object/__test__/index.spec.mjs b/packages/hash-object/__test__/index.spec.mjs
new file mode 100644
index 00000000..1ade4caf
--- /dev/null
+++ b/packages/hash-object/__test__/index.spec.mjs
@@ -0,0 +1,7 @@
+import test from 'ava'
+
+import { sum } from '../index.js'
+
+test('sum from native', (t) => {
+  t.is(sum(1, 2), 3)
+})
diff --git a/packages/hash-object/build.rs b/packages/hash-object/build.rs
new file mode 100644
index 00000000..738c6fbc
--- /dev/null
+++ b/packages/hash-object/build.rs
@@ -0,0 +1,7 @@
+extern crate napi_build;
+
+fn main() {
+  println!("cargo:rustc-link-search=native=/home/cayman/Code/hashtree/src/");
+  println!("cargo:rustc-link-lib=static=hashtree");
+  napi_build::setup();
+}
diff --git a/packages/hash-object/index.d.ts b/packages/hash-object/index.d.ts
new file mode 100644
index 00000000..c96fa3ae
--- /dev/null
+++ b/packages/hash-object/index.d.ts
@@ -0,0 +1,36 @@
+/* tslint:disable */
+/* eslint-disable */
+
+/* auto-generated by NAPI-RS */
+
+export function hash(left: HashObject, right: HashObject): HashObject
+export function hash64(left: HashObject, right: HashObject): HashObject
+export function hashtreeOne(left: HashObject, right: HashObject): HashObject
+export function hashtree(objects: HashObject[]): HashObject[]
+export function hashtreeUint8Array(input: Uint8Array): Uint8Array
+export function initHashObjectCache(n: number): void
+export class HashObject {
+  constructor(h0: number, h1: number, h2: number, h3: number, h4: number, h5: number, h6: number, h7: number)
+  static zero(): HashObject
+  static fromUint8Array(bytes: Uint8Array): HashObject
+  get h0(): number
+  get h1(): number
+  get h2(): number
+  get h3(): number
+  get h4(): number
+  get h5(): number
+  get h6(): number
+  get h7(): number
+  set h0(value: number)
+  set h1(value: number)
+  set h2(value: number)
+  set h3(value: number)
+  set h4(value: number)
+  set h5(value: number)
+  set h6(value: number)
+  set h7(value: number)
+  applyHash(other: HashObject): void
+  applyUint8Array(bytes: Uint8Array): void
+  toUint8Array(): Uint8Array
+  asBytes(): number[]
+}
diff --git a/packages/hash-object/index.js b/packages/hash-object/index.js
new file mode 100644
index 00000000..b9e23c77
--- /dev/null
+++ b/packages/hash-object/index.js
@@ -0,0 +1,306 @@
+/* tslint:disable */
+/* eslint-disable */
+/* prettier-ignore */
+
+/* auto-generated by NAPI-RS */
+
+const { existsSync, readFileSync } = require('fs')
+const { join } = require('path')
+
+const { platform, arch } = process
+
+let nativeBinding = null
+let localFileExisted = false
+let loadError = null
+
+function isMusl() {
+  // For Node 10
+  if (!process.report || typeof process.report.getReport !== 'function') {
+    try {
+      const lddPath = require('child_process').execSync('which ldd').toString().trim()
+      return readFileSync(lddPath, 'utf8').includes('musl')
+    } catch (e) {
+      return true
+    }
+  } else {
+    const { glibcVersionRuntime } = process.report.getReport().header
+    return !glibcVersionRuntime
+  }
+}
+
+switch (platform) {
+  case 'android':
+    switch (arch) {
+      case 'arm64':
+        localFileExisted = existsSync(join(__dirname, 'hash-object.android-arm64.node'))
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./hash-object.android-arm64.node')
+          } else {
+            nativeBinding = require('hash-object-android-arm64')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      case 'arm':
+        localFileExisted = existsSync(join(__dirname, 'hash-object.android-arm-eabi.node'))
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./hash-object.android-arm-eabi.node')
+          } else {
+            nativeBinding = require('hash-object-android-arm-eabi')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      default:
+        throw new Error(`Unsupported architecture on Android ${arch}`)
+    }
+    break
+  case 'win32':
+    switch (arch) {
+      case 'x64':
+        localFileExisted = existsSync(
+          join(__dirname, 'hash-object.win32-x64-msvc.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./hash-object.win32-x64-msvc.node')
+          } else {
+            nativeBinding = require('hash-object-win32-x64-msvc')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      case 'ia32':
+        localFileExisted = existsSync(
+          join(__dirname, 'hash-object.win32-ia32-msvc.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./hash-object.win32-ia32-msvc.node')
+          } else {
+            nativeBinding = require('hash-object-win32-ia32-msvc')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      case 'arm64':
+        localFileExisted = existsSync(
+          join(__dirname, 'hash-object.win32-arm64-msvc.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./hash-object.win32-arm64-msvc.node')
+          } else {
+            nativeBinding = require('hash-object-win32-arm64-msvc')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      default:
+        throw new Error(`Unsupported architecture on Windows: ${arch}`)
+    }
+    break
+  case 'darwin':
+    localFileExisted = existsSync(join(__dirname, 'hash-object.darwin-universal.node'))
+    try {
+      if (localFileExisted) {
+        nativeBinding = require('./hash-object.darwin-universal.node')
+      } else {
+        nativeBinding = require('hash-object-darwin-universal')
+      }
+      break
+    } catch {}
+    switch (arch) {
+      case 'x64':
+        localFileExisted = existsSync(join(__dirname, 'hash-object.darwin-x64.node'))
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./hash-object.darwin-x64.node')
+          } else {
+            nativeBinding = require('hash-object-darwin-x64')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      case 'arm64':
+        localFileExisted = existsSync(
+          join(__dirname, 'hash-object.darwin-arm64.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./hash-object.darwin-arm64.node')
+          } else {
+            nativeBinding = require('hash-object-darwin-arm64')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      default:
+        throw new Error(`Unsupported architecture on macOS: ${arch}`)
+    }
+    break
+  case 'freebsd':
+    if (arch !== 'x64') {
+      throw new Error(`Unsupported architecture on FreeBSD: ${arch}`)
+    }
+    localFileExisted = existsSync(join(__dirname, 'hash-object.freebsd-x64.node'))
+    try {
+      if (localFileExisted) {
+        nativeBinding = require('./hash-object.freebsd-x64.node')
+      } else {
+        nativeBinding = require('hash-object-freebsd-x64')
+      }
+    } catch (e) {
+      loadError = e
+    }
+    break
+  case 'linux':
+    switch (arch) {
+      case 'x64':
+        if (isMusl()) {
+          localFileExisted = existsSync(
+            join(__dirname, 'hash-object.linux-x64-musl.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./hash-object.linux-x64-musl.node')
+            } else {
+              nativeBinding = require('hash-object-linux-x64-musl')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        } else {
+          localFileExisted = existsSync(
+            join(__dirname, 'hash-object.linux-x64-gnu.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./hash-object.linux-x64-gnu.node')
+            } else {
+              nativeBinding = require('hash-object-linux-x64-gnu')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        }
+        break
+      case 'arm64':
+        if (isMusl()) {
+          localFileExisted = existsSync(
+            join(__dirname, 'hash-object.linux-arm64-musl.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./hash-object.linux-arm64-musl.node')
+            } else {
+              nativeBinding = require('hash-object-linux-arm64-musl')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        } else {
+          localFileExisted = existsSync(
+            join(__dirname, 'hash-object.linux-arm64-gnu.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./hash-object.linux-arm64-gnu.node')
+            } else {
+              nativeBinding = require('hash-object-linux-arm64-gnu')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        }
+        break
+      case 'arm':
+        localFileExisted = existsSync(
+          join(__dirname, 'hash-object.linux-arm-gnueabihf.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./hash-object.linux-arm-gnueabihf.node')
+          } else {
+            nativeBinding = require('hash-object-linux-arm-gnueabihf')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      case 'riscv64':
+        if (isMusl()) {
+          localFileExisted = existsSync(
+            join(__dirname, 'hash-object.linux-riscv64-musl.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./hash-object.linux-riscv64-musl.node')
+            } else {
+              nativeBinding = require('hash-object-linux-riscv64-musl')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        } else {
+          localFileExisted = existsSync(
+            join(__dirname, 'hash-object.linux-riscv64-gnu.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./hash-object.linux-riscv64-gnu.node')
+            } else {
+              nativeBinding = require('hash-object-linux-riscv64-gnu')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        }
+        break
+      case 's390x':
+        localFileExisted = existsSync(
+          join(__dirname, 'hash-object.linux-s390x-gnu.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./hash-object.linux-s390x-gnu.node')
+          } else {
+            nativeBinding = require('hash-object-linux-s390x-gnu')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      default:
+        throw new Error(`Unsupported architecture on Linux: ${arch}`)
+    }
+    break
+  default:
+    throw new Error(`Unsupported OS: ${platform}, architecture: ${arch}`)
+}
+
+if (!nativeBinding) {
+  if (loadError) {
+    throw loadError
+  }
+  throw new Error(`Failed to load native binding`)
+}
+
+const { HashObject, hash, hash64, hashtreeOne, hashtree, hashtreeUint8Array, initHashObjectCache } = nativeBinding
+
+module.exports.HashObject = HashObject
+module.exports.hash = hash
+module.exports.hash64 = hash64
+module.exports.hashtreeOne = hashtreeOne
+module.exports.hashtree = hashtree
+module.exports.hashtreeUint8Array = hashtreeUint8Array
+module.exports.initHashObjectCache = initHashObjectCache
diff --git a/packages/hash-object/npm/darwin-arm64/README.md b/packages/hash-object/npm/darwin-arm64/README.md
new file mode 100644
index 00000000..37f5e057
--- /dev/null
+++ b/packages/hash-object/npm/darwin-arm64/README.md
@@ -0,0 +1,3 @@
+# `hash-object-darwin-arm64`
+
+This is the **aarch64-apple-darwin** binary for `hash-object`
diff --git a/packages/hash-object/npm/darwin-arm64/package.json b/packages/hash-object/npm/darwin-arm64/package.json
new file mode 100644
index 00000000..6a0fb817
--- /dev/null
+++ b/packages/hash-object/npm/darwin-arm64/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "hash-object-darwin-arm64",
+  "version": "0.0.0",
+  "os": [
+    "darwin"
+  ],
+  "cpu": [
+    "arm64"
+  ],
+  "main": "hash-object.darwin-arm64.node",
+  "files": [
+    "hash-object.darwin-arm64.node"
+  ],
+  "license": "MIT",
+  "engines": {
+    "node": ">= 10"
+  }
+}
\ No newline at end of file
diff --git a/packages/hash-object/npm/darwin-x64/README.md b/packages/hash-object/npm/darwin-x64/README.md
new file mode 100644
index 00000000..f3663166
--- /dev/null
+++ b/packages/hash-object/npm/darwin-x64/README.md
@@ -0,0 +1,3 @@
+# `hash-object-darwin-x64`
+
+This is the **x86_64-apple-darwin** binary for `hash-object`
diff --git a/packages/hash-object/npm/darwin-x64/package.json b/packages/hash-object/npm/darwin-x64/package.json
new file mode 100644
index 00000000..7b02c7b2
--- /dev/null
+++ b/packages/hash-object/npm/darwin-x64/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "hash-object-darwin-x64",
+  "version": "0.0.0",
+  "os": [
+    "darwin"
+  ],
+  "cpu": [
+    "x64"
+  ],
+  "main": "hash-object.darwin-x64.node",
+  "files": [
+    "hash-object.darwin-x64.node"
+  ],
+  "license": "MIT",
+  "engines": {
+    "node": ">= 10"
+  }
+}
\ No newline at end of file
diff --git a/packages/hash-object/npm/linux-arm64-gnu/README.md b/packages/hash-object/npm/linux-arm64-gnu/README.md
new file mode 100644
index 00000000..6a31a913
--- /dev/null
+++ b/packages/hash-object/npm/linux-arm64-gnu/README.md
@@ -0,0 +1,3 @@
+# `hash-object-linux-arm64-gnu`
+
+This is the **aarch64-unknown-linux-gnu** binary for `hash-object`
diff --git a/packages/hash-object/npm/linux-arm64-gnu/package.json b/packages/hash-object/npm/linux-arm64-gnu/package.json
new file mode 100644
index 00000000..6bc1807c
--- /dev/null
+++ b/packages/hash-object/npm/linux-arm64-gnu/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "hash-object-linux-arm64-gnu",
+  "version": "0.0.0",
+  "os": [
+    "linux"
+  ],
+  "cpu": [
+    "arm64"
+  ],
+  "main": "hash-object.linux-arm64-gnu.node",
+  "files": [
+    "hash-object.linux-arm64-gnu.node"
+  ],
+  "license": "MIT",
+  "engines": {
+    "node": ">= 10"
+  },
+  "libc": [
+    "glibc"
+  ]
+}
\ No newline at end of file
diff --git a/packages/hash-object/npm/linux-x64-gnu/README.md b/packages/hash-object/npm/linux-x64-gnu/README.md
new file mode 100644
index 00000000..08ea126a
--- /dev/null
+++ b/packages/hash-object/npm/linux-x64-gnu/README.md
@@ -0,0 +1,3 @@
+# `hash-object-linux-x64-gnu`
+
+This is the **x86_64-unknown-linux-gnu** binary for `hash-object`
diff --git a/packages/hash-object/npm/linux-x64-gnu/package.json b/packages/hash-object/npm/linux-x64-gnu/package.json
new file mode 100644
index 00000000..3b1eba34
--- /dev/null
+++ b/packages/hash-object/npm/linux-x64-gnu/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "hash-object-linux-x64-gnu",
+  "version": "0.0.0",
+  "os": [
+    "linux"
+  ],
+  "cpu": [
+    "x64"
+  ],
+  "main": "hash-object.linux-x64-gnu.node",
+  "files": [
+    "hash-object.linux-x64-gnu.node"
+  ],
+  "license": "MIT",
+  "engines": {
+    "node": ">= 10"
+  },
+  "libc": [
+    "glibc"
+  ]
+}
\ No newline at end of file
diff --git a/packages/hash-object/npm/win32-x64-msvc/README.md b/packages/hash-object/npm/win32-x64-msvc/README.md
new file mode 100644
index 00000000..d5258866
--- /dev/null
+++ b/packages/hash-object/npm/win32-x64-msvc/README.md
@@ -0,0 +1,3 @@
+# `hash-object-win32-x64-msvc`
+
+This is the **x86_64-pc-windows-msvc** binary for `hash-object`
diff --git a/packages/hash-object/npm/win32-x64-msvc/package.json b/packages/hash-object/npm/win32-x64-msvc/package.json
new file mode 100644
index 00000000..f6a6720d
--- /dev/null
+++ b/packages/hash-object/npm/win32-x64-msvc/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "hash-object-win32-x64-msvc",
+  "version": "0.0.0",
+  "os": [
+    "win32"
+  ],
+  "cpu": [
+    "x64"
+  ],
+  "main": "hash-object.win32-x64-msvc.node",
+  "files": [
+    "hash-object.win32-x64-msvc.node"
+  ],
+  "license": "MIT",
+  "engines": {
+    "node": ">= 10"
+  }
+}
\ No newline at end of file
diff --git a/packages/hash-object/package.json b/packages/hash-object/package.json
new file mode 100644
index 00000000..8cfe0b02
--- /dev/null
+++ b/packages/hash-object/package.json
@@ -0,0 +1,39 @@
+{
+  "name": "hash-object",
+  "version": "0.0.0",
+  "main": "index.js",
+  "types": "index.d.ts",
+  "napi": {
+    "name": "hash-object",
+    "triples": {
+      "additional": [
+        "aarch64-apple-darwin",
+        "aarch64-unknown-linux-gnu"
+      ]
+    }
+  },
+  "license": "MIT",
+  "devDependencies": {
+    "@napi-rs/cli": "^2.18.0",
+    "ava": "^6.0.1"
+  },
+  "ava": {
+    "timeout": "3m"
+  },
+  "engines": {
+    "node": ">= 10"
+  },
+  "scripts": {
+    "artifacts": "napi artifacts",
+    "build": "napi build --platform --release",
+    "build:debug": "napi build --platform",
+    "prepublishOnly": "napi prepublish -t npm",
+    "test": "ava",
+    "universal": "napi universal",
+    "version": "napi version"
+  },
+  "packageManager": "yarn@4.1.0",
+  "dependencies": {
+    "typescript": "^5.3.3"
+  }
+}
diff --git a/packages/hash-object/rustfmt.toml b/packages/hash-object/rustfmt.toml
new file mode 100644
index 00000000..cab5731e
--- /dev/null
+++ b/packages/hash-object/rustfmt.toml
@@ -0,0 +1,2 @@
+tab_spaces = 2
+edition = "2021"
diff --git a/packages/hash-object/src/lib.rs b/packages/hash-object/src/lib.rs
new file mode 100644
index 00000000..988e5c6b
--- /dev/null
+++ b/packages/hash-object/src/lib.rs
@@ -0,0 +1,252 @@
+#![deny(clippy::all)]
+
+mod sha256;
+
+use std::{ffi::c_ulonglong, os::raw::c_uchar};
+
+use ethereum_hashing::hash32_concat;
+use napi::{bindgen_prelude::{Array, Uint8Array}, Env, Error};
+use sha256::digest_64;
+
+#[macro_use]
+extern crate napi_derive;
+
+#[repr(transparent)]
+#[derive(Copy, Clone)]
+#[napi]
+pub struct HashObject([u32; 8]);
+
+#[napi]
+impl HashObject {
+  #[napi(constructor)]
+  pub fn new(h0: u32, h1: u32, h2: u32, h3: u32, h4: u32, h5: u32, h6: u32, h7: u32) -> Self {
+    HashObject([h0, h1, h2, h3, h4, h5, h6, h7])
+  }
+
+  #[napi(factory)]
+  pub fn zero() -> Self {
+    HashObject([0; 8])
+  }
+
+  #[napi(factory)]
+  pub fn from_uint8array(bytes: Uint8Array) -> Result<Self, Error> {
+    let res: Result<&[u8; 32], _> = bytes.as_ref().try_into();
+    match res {
+      Ok(b) => Ok(Self::from_bytes(*b)),
+      Err(_) => Err(Error::from_reason("HashObject must be 32 bytes")),
+    }
+  }
+
+  #[napi(getter)]
+  pub fn get_h0(&self) -> u32 {
+    self.0[0]
+  }
+
+  #[napi(getter)]
+  pub fn get_h1(&self) -> u32 {
+    self.0[1]
+  }
+
+  #[napi(getter)]
+  pub fn get_h2(&self) -> u32 {
+    self.0[2]
+  }
+
+  #[napi(getter)]
+  pub fn get_h3(&self) -> u32 {
+    self.0[3]
+  }
+
+  #[napi(getter)]
+  pub fn get_h4(&self) -> u32 {
+    self.0[4]
+  }
+
+  #[napi(getter)]
+  pub fn get_h5(&self) -> u32 {
+    self.0[5]
+  }
+
+  #[napi(getter)]
+  pub fn get_h6(&self) -> u32 {
+    self.0[6]
+  }
+
+  #[napi(getter)]
+  pub fn get_h7(&self) -> u32 {
+    self.0[7]
+  }
+
+  #[napi(setter)]
+  pub fn set_h0(&mut self, value: u32) {
+    self.0[0] = value;
+  }
+
+  #[napi(setter)]
+  pub fn set_h1(&mut self, value: u32) {
+    self.0[1] = value;
+  }
+
+  #[napi(setter)]
+  pub fn set_h2(&mut self, value: u32) {
+    self.0[2] = value;
+  }
+
+  #[napi(setter)]
+  pub fn set_h3(&mut self, value: u32) {
+    self.0[3] = value;
+  }
+
+  #[napi(setter)]
+  pub fn set_h4(&mut self, value: u32) {
+    self.0[4] = value;
+  }
+
+  #[napi(setter)]
+  pub fn set_h5(&mut self, value: u32) {
+    self.0[5] = value;
+  }
+
+  #[napi(setter)]
+  pub fn set_h6(&mut self, value: u32) {
+    self.0[6] = value;
+  }
+
+  #[napi(setter)]
+  pub fn set_h7(&mut self, value: u32) {
+    self.0[7] = value;
+  }
+
+  #[napi]
+  pub fn apply_hash(&mut self, other: &HashObject) {
+    self.0 = other.0;
+  }
+
+  #[napi]
+  pub fn apply_uint8array(&mut self, bytes: Uint8Array) -> Result<(), Error> {
+    let res: Result<&[u8; 32], _> = bytes.as_ref().try_into();
+    match res {
+      Ok(b) => {
+        self.0 = unsafe { std::mem::transmute(*b) };
+        Ok(())
+      },
+      Err(_) => Err(Error::from_reason("HashObject must be 32 bytes")),
+    }
+  }
+
+  #[napi]
+  pub fn to_uint8array(&self) -> Uint8Array {
+    Uint8Array::from(self.as_bytes())
+  }
+
+  #[napi]
+  pub fn as_bytes(&self) -> [u8; 32] {
+    unsafe {
+      let output: [u8; 32] = std::mem::transmute(self.0);
+      output
+    }
+  }
+
+  pub fn from_bytes(bytes: [u8; 32]) -> Self {
+    unsafe {
+      let output: [u32; 8] = std::mem::transmute(bytes);
+      HashObject(output)
+    }
+  }
+}
+
+#[napi]
+pub fn hash(left: &HashObject, right: &HashObject) -> HashObject {
+  HashObject::from_bytes(hash32_concat(left.as_bytes().as_ref(), right.as_bytes().as_ref()))
+}
+
+#[napi]
+pub fn hash64(left: &HashObject, right: &HashObject) -> HashObject {
+  let mut output = HashObject::zero();
+  digest_64(left.0, right.0, &mut output.0);
+  output
+}
+
+#[link(name = "hashtree", kind = "static")]
+extern "C" {
+  pub fn hashtree_hash(output: *mut c_uchar, input: *const c_uchar, length: c_ulonglong);
+}
+
+#[napi]
+pub fn hashtree_one(left: &HashObject, right: &HashObject) -> HashObject {
+  let mut output: [u8; 32] = [0; 32];
+  let mut input: [u8; 64] = [0; 64];
+  input[..32].copy_from_slice(&left.as_bytes());
+  input[32..].copy_from_slice(&right.as_bytes());
+  unsafe {
+    hashtree_hash(output.as_mut_ptr(), input.as_ptr(), 1);
+  }
+  HashObject::from_bytes(output)
+}
+
+#[napi(ts_args_type = "objects: HashObject[]", ts_return_type = "HashObject[]")]
+pub fn hashtree(env: Env, objects: Array) -> Result<Array, Error> {
+  let objects_len = objects.len();
+  if objects_len % 2 == 1 {
+    return Err(Error::from_reason("Array must have an even number of elements"));
+  }
+
+  let mut output = vec![0u8; 32 * objects.len() as usize];
+  let mut input = vec![0u8; 64 * objects.len() as usize];
+  for i in 0..objects_len {
+    let obj: Option<&HashObject> = objects.get(i).unwrap();
+    match obj {
+      Some(obj) => {
+        input[(i * 32) as usize..((i + 1) * 32) as usize].copy_from_slice(obj.as_bytes().as_ref());
+      },
+      None => {
+        return Err(Error::from_reason("Array must contain only HashObjects"));
+      }
+    }
+  }
+
+  let output_len = objects_len / 2;
+  unsafe{
+    hashtree_hash(output.as_mut_ptr(), input.as_ptr(), output_len as u64);
+  };
+
+
+  let mut output_objects = env.create_array(output_len)?;
+  for i in 0..output_len {
+    match output_objects.set(i, HashObject::from_bytes(output[(i * 32) as usize..((i + 1) * 32) as usize].try_into().unwrap())) {
+      Ok(_) => {},
+      Err(err) => {
+        return Err(err);
+      }
+    }
+  }
+
+  Ok(output_objects)
+}
+
+#[napi]
+pub fn hashtree_uint8array(input: Uint8Array) -> Result<Uint8Array, Error> {
+  let input_len = input.len();
+  if (input_len % 64) != 0 {
+    return Err(Error::from_reason("Input must be a multiple of 64 bytes"));
+  }
+  let output_len = input_len / 2;
+  let mut output = vec![0u8; output_len];
+  unsafe {
+    hashtree_hash(output.as_mut_ptr(), input.as_ptr(), (output_len / 32) as u64);
+  }
+  Ok(Uint8Array::from(output))
+}
+
+static mut HASH_OBJECT_CACHE: Vec<HashObject> = Vec::new();
+
+#[napi]
+pub fn init_hash_object_cache(n: u32) -> Result<(), Error> {
+  unsafe {
+    HASH_OBJECT_CACHE = Vec::with_capacity(n as usize);
+    for _ in 0..n {
+      HASH_OBJECT_CACHE.push(HashObject::zero());
+    }
+  }
+  Ok(())
+}
\ No newline at end of file
diff --git a/packages/hash-object/src/node.rs b/packages/hash-object/src/node.rs
new file mode 100644
index 00000000..c0551d01
--- /dev/null
+++ b/packages/hash-object/src/node.rs
@@ -0,0 +1,123 @@
+#![deny(clippy::all)]
+
+use std::sync::Arc;
+
+use ethereum_hashing::hash32_concat;
+use napi::{bindgen_prelude::Uint8Array, Error};
+
+#[macro_use]
+extern crate napi_derive;
+
+pub enum NodeType {
+  Branch(BranchNode),
+  Leaf(LeafNode),
+}
+
+#[napi]
+pub struct Node(Arc<NodeType>);
+
+impl Clone for Node {
+  fn clone(&self) -> Self {
+    Node(Arc::new(match self.0.as_ref() {
+      NodeType::Branch(b) => NodeType::Branch(b.clone()),
+      NodeType::Leaf(l) => NodeType::Leaf(*l),
+    }))
+  }
+}
+
+#[napi]
+pub struct BranchNode {
+  hash_object: Option<HashObject>,
+  left: Node,
+  right: Node,
+}
+
+impl Clone for BranchNode {
+  fn clone(&self) -> Self {
+    BranchNode {
+      hash_object: self.hash_object,
+      left: self.left.clone(),
+      right: self.right.clone(),
+    }
+  }
+}
+
+#[derive(Copy, Clone)]
+#[napi]
+pub struct LeafNode(HashObject);
+
+#[napi]
+impl Node {
+
+  #[napi(getter)]
+  pub fn get_hash_object(&mut self) -> Result<HashObject, Error> {
+    match self.0  {
+      Ok(NodeType::Branch(b)) => {
+        match b.hash_object {
+          Some(h) => Ok(h),
+          None => {
+            let left = b.left.get_hash_object()?;
+            let right = b.right.get_hash_object()?;
+            let hash = HashObject::from_bytes(hash32_concat(left.as_bytes().as_ref(), right.as_bytes().as_ref()));
+            b.hash_object = Some(hash);
+            Ok(hash)
+          }
+        }
+      },
+      Ok(NodeType::Leaf(l)) => Ok(l.0),
+      Err(err) => Err(Error::from_reason(err.to_string())),
+    }
+    //   NodeType::Branch(b) => {
+    //     match b.hash_object {
+    //       Some(h) => h,
+    //       None => {
+    //         b.hash_object = Some(HashObject::from_bytes(hash32_concat(b.left.get_hash_object().as_bytes().as_ref(), b.right.get_hash_object().as_bytes().as_ref())));
+    //         b.hash_object.unwrap()
+    //       }
+    //     }
+    //   },
+    //   NodeType::Leaf(l) => l.0,
+    // }
+  }
+
+  #[napi(getter)]
+  pub fn get_root(&mut self) -> Uint8Array {
+    Uint8Array::from(self.get_hash_object().as_bytes())
+  }
+
+  #[napi(getter)]
+  pub fn get_left(&self) -> Option<Node> {
+    match self.0.as_ref() {
+      NodeType::Branch(b) => Some(b.left.clone()),
+      _ => None,
+    }
+  }
+
+  #[napi(getter)]
+  pub fn get_right(&self) -> Option<Node> {
+    match self.0.as_ref() {
+      NodeType::Branch(b) => Some(b.right.clone()),
+      _ => None,
+    }
+  }
+
+  #[napi]
+  pub fn is_leaf(&self) -> bool {
+    match self.0.as_ref() {
+      NodeType::Leaf(_) => true,
+      _ => false,
+    }
+  }
+}
+
+#[napi]
+impl BranchNode {
+  #[napi(constructor)]
+  pub fn new(left: &Node, right: &Node) -> Self {
+    BranchNode {
+      hash_object: None,
+      left: left.clone(),
+      right: right.clone(),
+    }
+  }
+}
\ No newline at end of file
diff --git a/packages/hash-object/src/sha256.rs b/packages/hash-object/src/sha256.rs
new file mode 100644
index 00000000..00fe5d4d
--- /dev/null
+++ b/packages/hash-object/src/sha256.rs
@@ -0,0 +1,183 @@
+// copied from as-sha256
+
+// constants used in the SHA256 compression function
+const K: [u32; 64] = [
+  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
+  0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
+  0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
+  0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
+  0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
+  0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
+  0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
+  0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
+  0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
+  0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
+  0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+];
+
+
+//precomputed W + K for message block representing length 64 bytes for fixed input of 64 bytes for digest64
+const W64: [u32; 64] = [
+  0xc28a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
+  0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+  0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+  0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf374,
+  0x649b69c1, 0xf0fe4786, 0x0fe1edc6, 0x240cf254,
+  0x4fe9346f, 0x6cc984be, 0x61b9411e, 0x16f988fa,
+  0xf2c65152, 0xa88e5a6d, 0xb019fc65, 0xb9d99ec7,
+  0x9a1231c3, 0xe70eeaa0, 0xfdb1232b, 0xc7353eb0,
+  0x3069bad5, 0xcb976d5f, 0x5a0f118f, 0xdc1eeefd,
+  0x0a35b689, 0xde0b7a04, 0x58f4ca9d, 0xe15d5b16,
+  0x007f3e86, 0x37088980, 0xa507ea32, 0x6fab9537,
+  0x17406110, 0x0d8cd6f1, 0xcdaa3b6d, 0xc0bbbe37,
+  0x83613bda, 0xdb48a363, 0x0b02e931, 0x6fd15ca7,
+  0x521afaca, 0x31338431, 0x6ed41a95, 0x6d437890,
+  0xc39c91f2, 0x9eccabbd, 0xb5c9a0e6, 0x532fb63c,
+  0xd2c741c6, 0x07237ea3, 0xa4954b68, 0x4c191d76,
+];
+
+// intermediate hash values
+static mut H: [u32; 8] = [0; 8];
+
+// hash registers
+static mut R: [u32; 8] = [0; 8];
+static mut T1: u32 = 0;
+static mut T2: u32 = 0;
+
+// 16 32bit message blocks
+static mut M: [u32; 16] = [0; 16];
+
+// 64 32bit extended message blocks
+static mut W: [u32; 64] = [0; 64];
+
+#[inline]
+fn ch(x: u32, y: u32, z: u32) -> u32 {
+  (x & y) ^ ((!x) & z)
+}
+
+#[inline]
+fn maj(x: u32, y: u32, z: u32) -> u32 {
+  (x & y) ^ (x & z) ^ (y & z)
+}
+
+#[inline]
+fn ep0(x: u32) -> u32 {
+  x.rotate_right(2) ^ x.rotate_right(13) ^ x.rotate_right(22)
+}
+
+#[inline]
+fn ep1(x: u32) -> u32 {
+  x.rotate_right(6) ^ x.rotate_right(11) ^ x.rotate_right(25)
+}
+
+#[inline]
+fn sig0(x: u32) -> u32 {
+  x.rotate_right(7) ^ x.rotate_right(18) ^ (x >> 3)
+}
+
+#[inline]
+fn sig1(x: u32) -> u32 {
+  x.rotate_right(17) ^ x.rotate_right(19) ^ (x >> 10)
+}
+
+#[inline]
+fn load_blocks(a: [u32; 8], b: [u32; 8]) {
+  for t in 0..8 {
+    unsafe {
+      M[t] = a[t];
+      M[t + 8] = b[t];
+    }
+  }
+}
+
+#[inline]
+fn expand_blocks() {
+  for t in 16..64 {
+    unsafe {
+      W[t] = sig1(W[t - 2]) + W[t - 7] + sig0(W[t - 15]) + W[t - 16];
+    }
+  }
+}
+
+#[inline]
+fn sha256_round(k: u32, w: u32) {
+  unsafe {
+    T1 = R[7] + ep1(R[4]) + ch(R[4], R[5], R[6]) + k + w;
+    T2 = ep0(R[0]) + maj(R[0], R[1], R[2]);
+    R[7] = R[6];
+    R[6] = R[5];
+    R[5] = R[4];
+    R[4] = R[3] + T1;
+    R[3] = R[2];
+    R[2] = R[1];
+    R[1] = R[0];
+    R[0] = T1 + T2;
+  }
+}
+
+fn hash_blocks(a: [u32; 8], b: [u32; 8]) {
+  unsafe {
+    for t in 0..8 {
+      R[t] = H[t];
+    }
+
+    load_blocks(a, b);
+    expand_blocks();
+
+    for t in 0..64 {
+      sha256_round(K[t], W[t]);
+    }
+
+    for t in 0..8 {
+      H[t] += R[t];
+    }
+  }
+}
+
+fn hash_w64() {
+  unsafe {
+    for t in 0..8 {
+      R[t] = H[t];
+    }
+
+    for t in 0..64 {
+      sha256_round(0, W64[t]);
+    }
+
+    for t in 0..8 {
+      H[t] += R[t];
+    }
+  }
+}
+
+fn init() {
+  unsafe {
+    H[0] = 0x6a09e667;
+    H[1] = 0xbb67ae85;
+    H[2] = 0x3c6ef372;
+    H[3] = 0xa54ff53a;
+    H[4] = 0x510e527f;
+    H[5] = 0x9b05688c;
+    H[6] = 0x1f83d9ab;
+    H[7] = 0x5be0cd19;
+  }
+}
+
+pub fn digest_64(a: [u32; 8], b: [u32; 8], out: &mut [u32; 8]) {
+  init();
+  hash_blocks(a, b);
+  hash_w64();
+
+  unsafe {
+    out[0] = H[0].to_be();
+    out[1] = H[1].to_be();
+    out[2] = H[2].to_be();
+    out[3] = H[3].to_be();
+    out[4] = H[4].to_be();
+    out[5] = H[5].to_be();
+    out[6] = H[6].to_be();
+    out[7] = H[7].to_be();
+  }
+}
diff --git a/packages/hash-object/yarn.lock b/packages/hash-object/yarn.lock
new file mode 100644
index 00000000..fca29e37
--- /dev/null
+++ b/packages/hash-object/yarn.lock
@@ -0,0 +1,1573 @@
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+# Manual changes might be lost - proceed with caution!
+
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+  cacheKey: 10c0
+
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+  bin:
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diff --git a/packages/ssz/test/memory/hash.test.ts b/packages/ssz/test/memory/hash.test.ts
new file mode 100644
index 00000000..70daf606
--- /dev/null
+++ b/packages/ssz/test/memory/hash.test.ts
@@ -0,0 +1,47 @@
+import {HashObject} from "../../../hash-object";
+import {testRunnerMemory} from "./testRunnerMemory";
+import {byteArrayToHashObject} from "@chainsafe/as-sha256";
+
+/* eslint-disable no-console */
+
+testRunnerMemoryBpi([
+  {
+    id: "hash-object - rust - 1",
+    getInstance: () => HashObject.fromUint8Array(Buffer.alloc(32, 0xff)),
+  },
+  {
+    id: "hash-object - js - literal 0prop",
+    getInstance: () => ({}),
+  },
+  {
+    id: "hash-object - js - literal 1prop",
+    getInstance: () => ({h0: 0}),
+  },
+  {
+    id: "hash-object - js - literal",
+    getInstance: () => ({h0: 0, h1: 0, h2: 0, h3: 0, h4: 0, h5: 0, h6: 0, h7: 0}),
+  },
+  {
+    id: "hash-object - js - 1",
+    getInstance: () => byteArrayToHashObject(Buffer.alloc(32, 0xff)),
+  },
+]);
+
+/**
+ * Test bytes per instance in different representations of raw binary data
+ */
+function testRunnerMemoryBpi(testCases: {getInstance: (bytes: number) => unknown; id: string}[]): void {
+  const longestId = Math.max(...testCases.map(({id}) => id.length));
+
+  for (const {id, getInstance} of testCases) {
+    const bpi = testRunnerMemory({
+      getInstance,
+      convergeFactor: 0.2 / 100,
+      // TODO - figure out if this is necessary
+      // computeUsedMemory: (memoryUsage) => memoryUsage.rss,
+    });
+
+    // eslint-disable-next-line no-console
+    console.log(`${id.padEnd(longestId)} - ${bpi.toFixed(1)} bytes / instance`);
+  }
+}
diff --git a/packages/ssz/test/perf/hash.test.ts b/packages/ssz/test/perf/hash.test.ts
new file mode 100644
index 00000000..5bebf249
--- /dev/null
+++ b/packages/ssz/test/perf/hash.test.ts
@@ -0,0 +1,137 @@
+import {itBench} from "@dapplion/benchmark";
+import {digest64HashObjects} from "@chainsafe/as-sha256";
+import {HashObject as HashObject_, hash, hashtreeOne, hashtree, hashtreeUint8Array, hash64} from "../../../hash-object";
+
+describe("hash", () => {
+  const n = 400;
+  const runsFactor = 1e2;
+
+  // itBench({id: "hash-object - zero - rust", runsFactor}, () => {
+  //   for (let j = 0; j < runsFactor; j++) {
+  //     const x = HashObject_.zero();
+  //   }
+  // });
+
+  // itBench({id: "hash-object - zero - js", runsFactor}, () => {
+  //   for (let j = 0; j < runsFactor; j++) {
+  //     const x = {h0: 0, h1: 0, h2: 0, h3: 0, h4: 0, h5: 0, h6: 0, h7: 0};
+  //   }
+  // });
+
+  itBench({id: "hashing - hashtreeOne", runsFactor}, () => {
+    let h = HashObject_.fromUint8Array(new Uint8Array(32));
+    for (let j = 0; j < runsFactor; j++) {
+      for (let j = 0; j < n; j++) {
+        h = hashtreeOne(h, h);
+      }
+    }
+  });
+
+  itBench({id: "hashing - hashtree", runsFactor}, () => {
+    const h0 = new Array(n * 2).fill(HashObject_.fromUint8Array(new Uint8Array(32)));
+    for (let j = 0; j < runsFactor; j++) {
+      hashtree(h0);
+    }
+  });
+
+  itBench({id: "hashing - hashtree uint8array", runsFactor}, () => {
+    const h0 = new Uint8Array(n * 64);
+    for (let j = 0; j < runsFactor; j++) {
+      hashtreeUint8Array(h0);
+    }
+  });
+
+  itBench({id: "hashing - rust", runsFactor}, () => {
+    let h = HashObject_.fromUint8Array(new Uint8Array(32));
+    for (let j = 0; j < runsFactor; j++) {
+      for (let j = 0; j < n; j++) {
+        h = hash(h, h);
+      }
+    }
+  });
+
+  itBench({id: "hashing - rust object rs-sha256", runsFactor}, () => {
+    let h = HashObject_.fromUint8Array(new Uint8Array(32));
+    for (let j = 0; j < runsFactor; j++) {
+      for (let j = 0; j < n; j++) {
+        h = hash64(h, h);
+      }
+    }
+  });
+
+  itBench({id: "hashing - rust object as-sha256", runsFactor}, () => {
+    let h = HashObject_.fromUint8Array(new Uint8Array(32));
+    for (let j = 0; j < runsFactor; j++) {
+      for (let j = 0; j < n; j++) {
+        h = digest64HashObjects(h, h) as HashObject_;
+      }
+    }
+  });
+
+  itBench({id: "hashing - as-sha256", runsFactor}, () => {
+    let h = {h0: 0, h1: 0, h2: 0, h3: 0, h4: 0, h5: 0, h6: 0, h7: 0};
+    for (let j = 0; j < runsFactor; j++) {
+      for (let j = 0; j < n; j++) {
+        h = digest64HashObjects(h, h);
+      }
+    }
+  });
+});
+
+describe("set 32 bytes", () => {
+  const runsFactor = 1e2;
+
+  const length = 32000;
+  const bytes1 = new Uint8Array(length);
+  const bytes2 = new Uint8Array(length);
+  const rand = (): number => Math.floor(Math.random() * (length - 32));
+
+  itBench({id: "Uint8Array.set", runsFactor}, () => {
+    for (let j = 0; j < runsFactor; j++) {
+      const offset1 = rand();
+      const offset2 = rand();
+
+      bytes1.set(bytes2.subarray(offset2, offset2 + 32), offset1);
+    }
+  });
+
+  itBench({id: "manual", runsFactor}, () => {
+    for (let j = 0; j < runsFactor; j++) {
+      let offset1 = rand();
+      let offset2 = rand();
+
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+      bytes1[offset1++] = bytes2[offset2++];
+    }
+  });
+});